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RE: USS Monitor ironclad
Nice Model...it caused me to research the monitor...amazing ship for it's time. Even more amazing is the raising of the turret/guns/a couple of seamen/all sorts of artifacts/and the engine....I can't believe I used up a whole evening looking at photos on the internet of it. Thanks Steve
Posted on: 11/18/2010 10:41 PM by Author "Doc.316"
in the forum "RC Scale Boating"
http://www.rcuniverse.com/forum/fb.asp?m=10144499
RE: I want to build a stick and tissue plane
Excelent PD1 great article....I used the glue sticks...oh..and thinned elmers glue also...just paint it on with a paintbrush.
Posted on: 11/16/2010 10:17 PM by Author "Doc.316"
in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=10140194
RE: Is the term “stall speed� proper for model airplanes?
Well, you know when the stall speed is too low....the nose go's down....you also know when the AoA is too high...the nose lowers... So...er...I vote "Yes"...I vote "NO"....."yes"..."No"...Yea..No... Well it is important...because if you go lower ...and you are close to the ground...er...."Bang"...so yes.... but I agree you do not know how close you are to stall speed....except that generally you are on the backside of the power curve...and the sink rate go's up... and even if you don't stall ...and you sink into the ground.....it is bad...so ....."No" I hope this clears everything up....![:D] Steve
Posted on: 11/8/2010 12:07 AM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10121914
RE: Jetco Models
Ok guys and gals....here is the Piper Super Cruizer....I want to see the others in the advertisement! I personally would like to see built "Jetco" models....please. Steve
Posted on: 11/7/2010 11:45 PM by Author "Doc.316"
in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=10121866
RE: Wen-Mac 049 outboard
Wow, a wen-mac...cool... Wen-mac's turned into testors...needle valves MAY be the same...or might work depending on the "mark" of then engine...example (mark III, mark IV...etc). And if everyone looks in the junk pile they could probably be found...I will look. You might try the 1/2 A aircraft forum...they have a lot of .049 stuff "traded" on there. Steve
Posted on: 11/3/2010 8:40 PM by Author "Doc.316"
in the forum "RC Boats General Discussion"
http://www.rcuniverse.com/forum/fb.asp?m=10113895
RE: New Cessna..what do you think?
Er...has anyone flown one of these yet? It seems like some have gotten out to the market. Steve
Posted on: 11/2/2010 11:29 PM by Author "Doc.316"
in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=10112336
RE: Announcement from Juno R/C
You will like singapore....(thinking)...I wonder if chiko's and charleys is still there..... When I went to visit the parents back in the 80's I went to the flying field....pretty cool stuff.... So you work for an oil company? Steve
Posted on: 10/17/2010 11:51 PM by Author "Doc.316"
in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=10075550
RE: Old mahogany boat finish
Laquer....30 coats...sanded between.....then polish the last few coats...with 1500 or greater rubbing compound... My daughter was in 4h....and put them on...it has to be the deepest finish I have ever seen....it was beautiful..!!! I am a realist...the laquer was nice..but soft.....Poly is harder...put it on the entrance threshold of the house....it has lasted 20 years...got to sand it down again this winter... ...and that is a LOT of feet....lol Oh, and boats also... Steve
Posted on: 10/17/2010 11:43 PM by Author "Doc.316"
in the forum "RC Scale Boating"
http://www.rcuniverse.com/forum/fb.asp?m=10075535
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Bmatthews...I just love the smileys in your last post.......I can tell you either must have been in competiion with the guy or everyone thought he would win hands down and didn't think they would have a chance....I can just see everyone getting their "circular flow" books out when it was starting to go down. Well, what everyone probably doesn't realize (and this is a fact with the teams that I have worked with in both the AIAA and SAE competitions...(and it is kind of interesting). The teams with one or two modelers on the team that fly RC do not do as good as the teams with NO modelers on them. Ok...tell me why that is? I do know that I give "hints" to the teams....I am thinking that the teams that have non modelers pick these up...and the modelers tend to do their own things. I did tell one AIAA team "lightness is the key to winning" ....(and they built a really really light plane)...in fact it would have been up there if the gearbox had not come apart...(sigh)...I think they were still in the top 15...with only 2 flight scores. I think really what we should be telling these teams is: Multiple designs could win if the team gets together and works well with each other (I have had some teams literally explode....kind of like the free flight plane...lol)...and each part of the team (aero, structures, etc) optimises (bad spelling) each segment of the airplane. Like this team...I would give them this "hint"......1.Find a "serious pylon flyer" where you are from....2. Let him run in your engine.... 3. Let him "tune" your engines to the fuel used...(Let me tell you something about engines...when you tune an engine for max power (and that is what you need to lift a load)...you need to look at the timing (think glowplugs) since the heat of the glowplug determines timing....along with compression ratio...er thickness of the head gasket...er.....4. Buy 4 "stock" engines...one will be better than the others. (hey, it costs some money to win...I used to buy 6 at a time for pylon racing). I suspect the advantages of doing this will outweigh all the drag reduction techinques you can come up with!......wow 4 Jetts are going to cost the university some money....(sell the ones that arent "the one"...)...[:D] This is my final "hint"...can't wait to see the Utube video of the Jett with the reduction drive....[:D] Steve
Posted on: 10/14/2010 12:10 AM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10067457
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Yes that is the one Tarus Flyer...the channel wing would take off stol...ok in climb....slow...everything you would want in a SAE plane...except for making the structures guy go crazy...lol. I think your analysis for free flight is spot on. The analysis seems good also. When loaded the planes I have flown did exhibit a strong downward pitching moment (due to lift or weight being in front of the cg or a combination) even with the high neg lift aerofoils (upside down)....the worst of these was the flying wing (think horton) that had to be flown with almost all up elev travel. This was probably due to the fact that the wing had a small tail volume coeficient (no tail really) to counteract the weight. So thinking about this the way to go about getting something that would fly well....is to have an adjustable elevator incidence...Start flying it with no payload...then add payload and retrim with the elevator incidence "screw" until trim was obtained with that weight (or a close to trim condition at least) then keep flying and plotting untill a chart was derived for the airplane of "trim screw position" versus weight was obtained. The other option would be to move the cg around with weight to obtain the zero weight trim...of course this would change your stability...which if you had to put the CG behind the neutral point to trim might not be very good. So this sound correct? Steve
Posted on: 10/12/2010 10:58 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10065252
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Shrouded propellers?...are tough. See pics. With and without....Obviously, this is going to be just like any other airplane design where there are tradeoffs..so if you could come up with a really good way to implement ideas, a good way to build a strong structure and put the strength in the correct place is going to win....if you want high lift you can't beat the airplane with 1/2 fans in the wing...I will look for a picture. Steve
Posted on: 10/10/2010 4:00 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10059866
RE: JR Radio History & Pics
What about the Apolo 4 (I believe)...it was the original $99 radio (and was amazing since it was only 99 bucks...). Steve
Posted on: 10/10/2010 1:14 AM by Author "Doc.316"
in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=10058843
RE: Straight from the 1960's
Wow, I like it...those are some (obviously built in the 60's) funky couplers. They look like a couple of "ball joints" with a slider in the middle? They would make the motor setup easy I would think. Nice boat!.... Steve
Posted on: 10/10/2010 1:04 AM by Author "Doc.316"
in the forum "RC Scale Boating"
http://www.rcuniverse.com/forum/fb.asp?m=10058830
RE: Midwest Tri-Squire
Wow, nice....your flying field makes me appreciate mine. We have no trees in Kansas...lol Well, at least not tall ones. Beautiful airplane....must fly pretty good if you are flying it off a jogging path....[:D] Steve
Posted on: 10/10/2010 12:57 AM by Author "Doc.316"
in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=10058822
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Well, I think it is the combination of things... If you are loading up a lot of weight (and we are talking about 2x-3x the weight of the aircraft (geese that would be like a 172 with a 7000+ pound payload) even if you keep the CG near the neutral point you are going to get some moment...a lot of moment... most airfoils when lifting give a moment...the more weight the more moment....(and with a radical high lift aerofoil this could add to the moment)...and could get quite steep with airspeed as you pointed out. Downwash on the tail could also be an issue since to lift a heavy load you must push down more air....which could change the flow at the tail. So I am voting for all of the above...it all seems like it will have an effect.....lol. Where I work I am more on the "testing" end of the process....so since school (which was many moons ago)..I haven't really been able to get too theoretical so to speak. From a testing standpoint I can say when you load up a model the trim changes get crazy and are probably a combination of things going on...that is typically what I have found with both models and er..full size airplanes. I can tell you that when you get a highly loaded wing things get critical in a hurry and to fix problems you try some stuff until the airplane does what you want it to....and sometimes you don't really figure out what was going on. I guess I have seen too many smart people come up with good ideas on a problem then find out that the problem is not as simple as they think. You gave me some good ideas on why this might happen..the next team I will get them to research it a bit. So where did you go to school UStik? I haven't ever figured out the telemaster tail either....freeflight tails typically are lifting...airfoil in the upright position...but they tend to balance way far back...so you would expect that. The telemaster...I have no idea why....most of the airplanes I have come up with were pattern type planes...the old ballistic type (you know similar to Curare...Deception...etc), a few delta's and a couple of tailess airplanes. I let the "young engineers" design their own stuff.... It was interesting at the hobby shop today one of the kids who go's to university was trying to pick my brain about this competition...and for the "standard class" no carbon fiber is allowed...and they have to take off in a certain distance....this is going to make things interesting for the teams....I also found out for "standard class" only a 1-1 gearbox is allowed...so all you unlimited class teams...get the cnc machines fired up and build some gearboxes....lol Steve
Posted on: 10/10/2010 12:51 AM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10058815
RE: Straight from the 1960's
Sweet...I like it... What size of motors do you have in it? It looks like it runs really well. Steve PS...needs a bikini babe laying on the back deck in a lawnchair...[:D]
Posted on: 10/8/2010 10:30 PM by Author "Doc.316"
in the forum "RC Scale Boating"
http://www.rcuniverse.com/forum/fb.asp?m=10056962
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Well all the teams I have flown have used extremely high lift aerofoils...pitching moment of the wing would be high...I guess that is why they were using one of those stupid (or I thought) inverted airfoils on the tail....though some of the airfoils weren't as wild as others and they also did the same thing...... To be honest these airplanes are truly amazing at the amount they can lift...they make a scale ship seem pretty tame...and a 70's pattern ship seem like a glider...I used to be pretty afraid of test flying some of the underpowered scale planes that would show up at the field...but as long as they climb out I am ok with them....untill I have to try and teach the owner to fly it.... I don't think they are overpitched...generally I try to "smooth them" off the runway and scare the dickens out of the kids who build them...just to make doubly sure I get off on the top side of the power curve... I can tell the teams one thing to avoid...don't mount the CG way ABOVE the aircraft...(one team did this) and the airplane was pretty much uncontrolable. (as you can imagine). Steve
Posted on: 10/8/2010 10:20 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10056944
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Well the one that was the worst was the flying wing since it had a very small cg range to begin with....and to be honest the tail power of the flying wings all have been a little on the low side (Though it did carry a LOT of weight). Some of the conventional models had way more tail power but would trim way out of trim range of the normal transmitter even when we were pretty close to the optimum cg. We would balance forward and then move it back untill I could hardly fly the thing....but even doing that I have gotten good at holding in 1/2 stick up when loaded...we finally got where we (read I) were programming in several different modes depending on the weight. I wonder how much the trim changes on a b52 when it lets go of all the bombs... Steve
Posted on: 10/7/2010 10:02 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10054776
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
LOL..no not really a trick question...(I think)...most of the manual's I build normally have the foward CG as a line....but we are loading them up quite to the point of what some of these competition models are. I will have to look to see if any are cut back at the high gross weights. I was just wondering since it is a little disconcerting when you are flying a model at a good climb speed where it is barely climbing and the elevator is all the way back....lol. It kind of makes you wonder what you are going to do to land.... Steve
Posted on: 10/7/2010 12:07 AM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10053061
RE: Captain Bobbie?
Ok...now I know what you mean...I was always wondering what the lathe motors were that everyone was talking about...com lathe motors...thanks for the info!
Posted on: 10/7/2010 12:00 AM by Author "Doc.316"
in the forum "RC Scale Boating"
http://www.rcuniverse.com/forum/fb.asp?m=10053052
RE: Captain Bobbie?
Ok...lathe motor...are we talking like a harbor freight special? Hum......where is a good supply?
Posted on: 10/4/2010 10:46 PM by Author "Doc.316"
in the forum "RC Scale Boating"
http://www.rcuniverse.com/forum/fb.asp?m=10048035
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Oh...okie="guy or gal from oklahoma...kind of a hillbilly sort"....lol. Well it amazes me what they (the university teams) come up with considering they know nothing about conventional building practices. We had one heavy lift team (that didn't get their application to go to competition in quick enough...[:@]) came up with a replica of a horton flying wing. They were trying to maximize wing area. That thing lifted a lot of weight and when I compared it to the competition weights flown in that class would have won. It was a sad deal but the design was outstanding...and they did their homework on it because when we flew it the first time it was GREAT right out of the car. Ok, all you aerodynamicists...I have a question that I think I know the answer to but want some conformation. When the teams start to load up these competition models really heavy and they use the same static margin. The first thing I notice is that the trim changes (not suprising since the CG vector is larger and the distance from the CG to the neutral point is the same. (so that makes sence I suppose)...but eventually after loading more and more weight I run out of tail power to counteract this moment so I have to get them to eventually move the CG back....basically cutting off the front top of the CG vs weight diagram. I haven't seen any full size airplanes have to do this. What do you think? Steve
Posted on: 10/4/2010 10:43 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10048029
RE: 2.4GHz Single-channel
This stuff is just too cool......My only comment would be from looking at the video is that you guys had better use a pretty good pushbutton switch since that thing is getting the stuffing used out of it....! Keep up the good work...hope to see some video of the planes flying. Steve
Posted on: 10/3/2010 8:54 PM by Author "Doc.316"
in the forum "Golden Age, Vintage & Antique RC"
http://www.rcuniverse.com/forum/fb.asp?m=10045348
RE: Captain Bobbie?
Sorry I've been out running boats for the whole weekend...went camping at the lake. Oh...jeese I forgot to say that it was 26" long...by 10.5" wide... Oh...wow..you have to think extreme cheap budget...(thinking that I am giving this boat away for free including the radio/motors/everything)..I was considering a couple of high amp microswitches for forward and reverse...it seems to work on the dumas trojan that I have...though docking isn't too scale like when we "blip" it coming in. I will look at rock crawler motors...anyone ever try electric window motors?...seems like they might fit the budget if the 550's don't cut the mustard... Steve
Posted on: 10/3/2010 8:44 PM by Author "Doc.316"
in the forum "RC Scale Boating"
http://www.rcuniverse.com/forum/fb.asp?m=10045314
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Ok...USStick....Ok...I guess you did understand my okie english....[:D]. It would be cool to start a competition similar to the SAE or the AIAA competitions for the average joe blow modeler with an engineering degree to see what would show up... One might be suprised of some of the models and the engineering effort that might go into a competition like that. I am pretty amazed at the amount of engineering going into the USRA models with the fuel injection systems...aero...and such. When you are on one of the AIAA or SAE teams it kind of hurts when you have to bite your lip when they come up with something off the wall that you know from experience won't work....sigh Steve
Posted on: 10/3/2010 8:30 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10045261
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Oh USStick; When I said broke the rules...I meant broke the "rules of design"...and built an airplane that was giant at the time...had two geared motors to power it....super light weight...etc..... If you look at all the other pattern planes of the era they kind of slowly "developed"...from the missle type to the modern day pattern plane and it was years before someone would build a plane with a similar thrust/weight ratio...it probably didn't happen until the YS supercharged planes came to be. (the saying is kinda an american one but is not taken literally). All competitiors "bend the rules" a bit...or as I like to think of it "if the rule isn't there you can't break it....but if you win the rule will be there next year)....! Wow all these cool gear drives and belt drives...makes me want to machine one out just to feel the thrust... Steve
Posted on: 9/30/2010 10:38 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10039433
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Wow..USStik...I looked around everyplace...but on here....amazing I haven't seen those pictures in a LONG time....of course I was a wee lad back then..[:)] Yes...the real engineering work (if you want to win) will be in the creation of the gearbox...which from the looks of the SAE competition should be a piece of cake...... Just cut off half of hannos gearbox and go from there...the gears could be fabricated from hele parts...if the ratio was right...but there are gears out there...and most university's have a gruff old guy that runs a machine shop...with a cnc... Oh btw the dalotel was the father of all the giant scale pattern designs we have now since it "broke the rules...within the rules" and was the first big slow airplane with tons of thrust... It is interesting...most schools are shrouded in secrecy...and are consantly scouring the internet for intelligence....Hum...guess there will be some geared Jett's out there..lol Steve
Posted on: 9/29/2010 10:53 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10037018
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Look at zdz geared engines....belt drive...nice looking unit...seems to be similar to the one a major acft company used on a full sized plane with a wankel. Steve
Posted on: 9/29/2010 12:08 AM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10034646
RE: Lift 2: Fowler vs. Conventional Flaps; Dual Airfoil(root/tip); Winglets
Well...I have had rossi's...OPS....and JETT...In a land far long ago I was a pattern flyer....then an air racer...and to be honest the jett wins hands down......now with that said... I have run OPS...really good engines in their day....60's for pattern planes.....Rossi 40's for pylon...before we got the nelsons....and jetts....then we put the jett in the lil tony...1.4 scale...and WOW I was in love!...it would idle...it would transition...and man would it run!....In the little tony...we could actually beat the B class quickies (and the little tony would not turn near as tight).....but to be honest I am just someone off the net (even though i am an engineer)...so you have to go with the data....and if the data shows up as the rossi is better you have to run with it.... ....as far as gearboxes go...you will have to build one. Or the engineering team will...think a simple structure of aluminum...some gears from boston gear....probably straight cut...(simpler and cheaper)...some bearing races...some mongo bearings...(think of that big prop up there)....and you have a gearbox...the engineering part should be left up to the team to design and build...(that is what the competition is all about isn't it)....I will look around for a pic of Hanno's gearbox on the dalotel...it is going to be hard to find since it would have been back in the 70's when he built it.... Yes, on some of the AIAA planes it was helpfull to raise flaps for the climb...what you have to make sure you do is not raise them too quickly...or else..er boom.. Steve
Posted on: 9/28/2010 11:57 PM by Author "Doc.316"
in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=10034632
Captain Bobbie?
Hello Guys and Gals, I am an airplane guy....but I have a few boats...(5 gas...4 electric scale) This project all started with the wife and I going camping...at a place I could not fly....but could run boats. So we ran boats....the electric scaleish stuff. An older lady came out and watched and watched...and so I let her run the swordsman around and all was good. Her husband said "I am buying a boat for her for her birthday!"...we got her a proboat volare...very fast (too fast)...and very pretty (the husband got a little protective of the boat!) I said to myself I will build her a boat ...and looked around the net for plans...and found push tug plans....scale ones. Well, after some building here is where I am....It is a 1.5 times push tug....and this is what it looks like. It was expensive...I had to put in a new floor for my wife to get the left over underlayment to build it!....[:D] The motors were expensive....two 550 motors given to me by a car guy...and a radio put together from parts given to me from the local hobby shop guy (rebuilt the short in the transmitter...fixed a reciever that went underwater in a car?...it works great!) So I have 6 bucks in it so far (besides the new floor).... The question is ...will two water cooled 550 motors be "OK" for this project???? They will be water cooled...I am not looking for speed...or pushing power...just a couple of cheap motors to push the tug. Things have to be simple....trying to stay away from gear drives etc...we are talking about a couple of 70 year olds here...think low maintenance...lol.. Thanks for your support...Steve
Posted on: 9/28/2010 11:35 PM by Author "Doc.316"
in the forum "RC Scale Boating"
http://www.rcuniverse.com/forum/fb.asp?m=10034588
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