parts list
I have unsucessfully looked all over for a parts list for the RCV engines. What's the big secret?
Posted on: 10/6/2009 5:45 AM by Author "skyjockey" in the forum "RCV Engines Support"
http://www.rcuniverse.com/forum/fb.asp?m=9150463

exaust manifold
Is there more than one exaust manifold available for the 120 SP ?
Posted on: 9/15/2009 9:15 AM by Author "skyjockey" in the forum "RCV Engines Support"
http://www.rcuniverse.com/forum/fb.asp?m=9097167

datum line recovery
I have come into possesion of a H9 Corsair (60 size). Nothing exists from the wing saddle foward. I only have remnents of the firewall and first bulkhead. The leading edge of the wing where the locator dowel pins are is smashed. There is one stringer that connects to the firewall that gives me the location of the firewall but that's it. I can reproduce the parts but I have no idea what the angles should be or what to use as a datum line from which to measure those angles. Anybody have any ideas where to start?
Posted on: 9/8/2009 11:50 AM by Author "skyjockey" in the forum "Crash & Rebuild"
http://www.rcuniverse.com/forum/fb.asp?m=9078689

RE: metric sized material
You're right, that would be drastic fix for me, but I appriciate your reply. You would think, with the proliferation of ARFs, there would be much demand for replacement "parts". On the other hand, there's more money to be made selling you a wing or a fuse than a few dollars worth of wood. DISSPIRITING state of the hobby.
Posted on: 9/4/2009 2:02 PM by Author "skyjockey" in the forum "Crash & Rebuild"
http://www.rcuniverse.com/forum/fb.asp?m=9069698

metric sized material
Does anyone know of a stateside supplier of balsa and plywood dementioned in metric? Repairing ARFs would be considerably easier if I could get hold of some. For instance, my buddy tore the nose off of his EXTRA 300 SP. The repair will be simple enough, but the superstructure plywood is 2 mm thick. 1/16th too thin 3/32nds too thick.
Posted on: 9/3/2009 6:26 PM by Author "skyjockey" in the forum "Crash & Rebuild"
http://www.rcuniverse.com/forum/fb.asp?m=9067795

prop shaft extention
How much, if at all, can the prop shaft be extended of a 120 SP? Is 1 in. possible?
Posted on: 7/7/2009 11:21 AM by Author "skyjockey" in the forum "RCV Engines Support"
http://www.rcuniverse.com/forum/fb.asp?m=8913297

RE: Keeping cool
Michael211 Thank you for your reply. The cool-power sounds like a great first step. Did you have opportunity to measure the amount of temperature drop achieved? The Tucano has a nose gear at the bottom of the cowl. The only opportunity for exaust air is the "turbine exaust pipes'. I'm not sure that will be adaquate.
Posted on: 6/22/2009 2:07 PM by Author "skyjockey" in the forum "RCV Engines Support"
http://www.rcuniverse.com/forum/fb.asp?m=8871661

Keeping cool
With the cooling problems of the RCV SP's, how are they ever used in a model like a Mustang? I have a EMB 312 Tucano that the SP would be a good fit, but the cooling problem looms big. What have others done to get passed it and still remain scale?
Posted on: 6/22/2009 5:26 AM by Author "skyjockey" in the forum "RCV Engines Support"
http://www.rcuniverse.com/forum/fb.asp?m=8870699

RE: rivet detail tape
Try FLITEMETAL.COM, they have a product called Rosie Rivitor. Or you could make the stuff yourself.
Posted on: 4/23/2009 9:45 AM by Author "skyjockey" in the forum "RC Scale Aircraft"
http://www.rcuniverse.com/forum/fb.asp?m=8708201

RF interference
What exactly is going on in metal to metal contact to cause servos to jitter and such. Does it have to be ferrous metal to ferrous metal. Does the same thing happen when brass or aluminum is involved? There is a lot of metal to metal in engines, landing gear, etc:.
Posted on: 4/20/2009 10:57 AM by Author "skyjockey" in the forum "Questions and Answers"
http://www.rcuniverse.com/forum/fb.asp?m=8698416

RE: F3F-2 scratch build
This thread seems to be becoming more of a construction thread than an aerodynamics thread. To get back on track, I would like to raise the subject of wing tips, not only as it applies to my concerns, but also to the hows and whys the subject applies to scale modeling in general. To my concerns: The wing section is a Clark YH. The TE begins to taper three ribs before the LE. That is, the chord "seems" to shorten while the front half of the wing section remains unchanged until the last three ribs where it seems to revert back to a smaller YH section. There is a break in the aileron LE also.?? That is the best I can eyeball the situation. I have no contradicting data as to any other wing section involved. That part of the wing accounts for a significant amount of wingspan. Needless to say, it needs to preform as efficiently as possible. The whole oval shape, whether just tips or entire wings, is a cureous design to me. Every wing section is a scaled down version of the preceding section. Does that not imply decreasing Rn's all along the wing until zero? Yet the oval wing is the most efficient. I must be missing volumns of knowledge here. That said, I could simply make the tips aesthetically pleasing and hope for the best. Or do you have a better suggestion? Please advise.
Posted on: 4/6/2009 10:48 AM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8653892

RE: F3F-2 scratch build
Mr. Hanson The foam core wing is an interesting alternative. I do, however, have a couple of questions. Did you glass the sheeting before applying the cap strips? Is that not where the foam cored wing gets a great deal of it's strength? In the end, how convincing was the illusion? The F3F has a Clark YH airfoil that is app. 13% thick. Each wing has two spars of app. the same size. Although I plan to construct a "light" spar, they will be capped with CF ribbon and shear webbed. I plan to devise a method of applying the CF ribbon, top and bottom, at the same time such that they cure at the same time before temp. and humidity change the wood. Perhaps building tabs on both sides of the ribs. There are 70 to 80 ribs all togeather, the majority of which will be made of 1/16th balsa. The critical ribs will be 1/8th lite ply or 1/8th CF sandwiched balsa. The trailing edge will be 1/32nd G-10. Anyway, those are my plans (of mice and men ???) to acheive a light, strong and square wing. Any thoughts? Mr. Mathews The flying wires I have chosen seem at first glance to be more than adequate. For instance, the 2mm wire fails at app. 390 lb. force. Assuming 60% failure load, the wire should begin to yield at 220 lb.s. The failure happened in the streamline section. The wires for this model scale at 3.8mm. I haven't done the math, but I seem to be well inside the park.
Posted on: 4/5/2009 9:32 AM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8650279

RE: fliteskin
Has Fliteskin gone out of bussiness?
Posted on: 3/13/2009 10:29 AM by Author "skyjockey" in the forum "RC Warbirds and Warplanes"
http://www.rcuniverse.com/forum/fb.asp?m=8573563

RF interference
Why is it much ado is made over RF interference from clevis -control horn ,etc., metal to metal contact, but no caution is raised about metal to metal contact in retractable landing gear?
Posted on: 3/7/2009 1:47 PM by Author "skyjockey" in the forum "Questions and Answers"
http://www.rcuniverse.com/forum/fb.asp?m=8553011

RE: Slightly off topic
I know this is a little off subject but there is something I have wondered about. When an aircraft becomes trans-sonic, what is happening inside the turbine? Are conditions trans-sonic in there too? What's going on at the intake with the shock waves bouncing around?
Posted on: 3/4/2009 9:03 PM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8542818

glue
What glue "bonds" nylon?
Posted on: 3/4/2009 11:31 AM by Author "skyjockey" in the forum "Scratch Building, Aircraft Design, 3D/CAD"
http://www.rcuniverse.com/forum/fb.asp?m=8542996

RE: Prop efficiency, 2 versus 3 blades
To whom Do not propellers suffer from tip vortices and their inherent inefficiences the same as wings? What do they do to overcome, washout? Is it true that some racers use only one blade? What would their thinking be? I notice the article says "proper aerodynamic shape near the spinner". Is that not incorperated in model size props? It seems whomever I talk to, three or four blade props are discouraged. That they are only for looks,and if you want maximum preformance in every area use the two blade. What say you?
Posted on: 3/4/2009 10:06 AM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8542736

RE: MythBusters Airplane Takeoff Myth
Physics is a science. Science is only possible with logic. Logic is a system of principles that enables valid reasoning. Rationalizing is a form of sophistry which is unsound but plausible reasoning for the sole purpose of winning an argument.
Posted on: 3/2/2009 10:47 PM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8537750

RE: MythBusters Airplane Takeoff Myth
HP , you say you have a knowlege of physics . Then you must know something of vector analysis. Show me, please demonstrate for me ANY opposing force generated from ANY source that can overcome the thrust of the prop. Yes, the wheels have ANGULAR momentum and it will want to precess but what force vector is generated in opposition to the thrust vector.
Posted on: 3/2/2009 6:04 PM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8536650

RE: MythBusters Airplane Takeoff Myth
Some times I think I must be speaking in tounges. The fundamental point that is missed is the answer to the question; How is a prop driven fixed wing aircraft impeled? The treadmill is a tar-baby on which the brain gets stuck (not everyone). All of the other stuff, tailwinds, terminal velocity. friction, lugs on wheels, etc., are straws one grasps for to rationalize and justify the original error.
Posted on: 3/1/2009 2:01 PM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8532002

RE: MythBusters Airplane Takeoff Myth
Put the airplane on an airstrip on the equator facing east. The Earth is the treadmill. Are some of you saying the thing can't take off until it goes faster the the true speed of the earth at that point? C'mon . Funda"mentals" genlemen. Even Einstien can't ignore them. GEEEZ
Posted on: 2/28/2009 12:55 PM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8528209

RE: F3F-2 scratch build
Mr. Mathews Thank you for your interest and comments. I have, however, decided to give up on X-1 (17% scale) and am procedeing to X-2.(20%). This, a pleasant suprise, yields almost a 50% increase in wing area. I think you will agree this gives me a lot more breathing room. With what I have learned on this forum together with a construction decision I've made, I believe I can bring in X-2 at the same or possibly less weight than X-1. If you have the time, I would like to dis cuss that decision; on which I invite your critique. It came as a minor revelation to me that if I attached both wings just like the full scale I would not have to rely on robust spars, wing tubes, etc.(weight saving), or an invasive wing saddle cut-out in the fuse. The only things I needed were flying wires on which I can rely. Those I believe I've found. This simplifies things in too many ways to enumerate here. One other thing while you're here. I have managed to locate all hardware, electronics, etc. at or below the thrust-line. This, I thought will help ground handling, but what do you think about the flight characteristics? Once the wings are attached and trimmed, they will remain that way. Ease of hadling the model will be facilitated by separating the fuselage at the seam line behind the cockpit. Waduya Tink?
Posted on: 2/26/2009 3:26 PM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8521214

RE: F3F-2 scratch build
As you can see, they do retract. And, if I do say so myself, are pretty darn scale.
Posted on: 2/24/2009 11:09 AM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8512763

RE: RFI shielding
By the way, y'all have a Merry Christmas and healthy and prosperous New Year.
Posted on: 12/17/2008 10:46 AM by Author "skyjockey" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8254724

RE: RFI shielding
Please refer to this forum to a thread started by Valhala re Gas Saito page 14 about half way thru where a fellow experienced servo jitters even though using 2.4 ghz. He had just got the engine back from Hoizon ,I believe, with a new ignition system installed. We have all witnessed a fellow preflighting his plane at the airfield, come up with a jittery servo(s), and spend the rest of the afternoon unsucessfully trying to find the source.(Gremlins???) It is now obvious to me that CF does not make a "Faraday Cage". But it does have inherent RF absorbtion qualities. Skin effect ? Why not use it and leave the rest of your investment to operate in it's shadow?
Posted on: 12/17/2008 10:42 AM by Author "skyjockey" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8254713

RE: RFI shielding
I feel like I have asked a really stupid question. My reasoning is this . The plug and cable are surounded by a grounded metal plug cap and wire mesh. What does this do? Is this setup part of the shielding? I have heard mention of a resistor type plug about which, I confess, know ziltch. Amoung other things you say? Anyway, a CF fus must carry the antenae on the outside because the CF interferes with the incoming RF. Does it not stand to reason if the CF won't let it in, it won't let it out? Another layer of protection is a good thing, No?
Posted on: 12/14/2008 6:15 PM by Author "skyjockey" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8245566

RFI shielding
Would a grounded carbon fiber overlay on the firewall, inside the nacelle-cowling, etc., act as an effective RFI shield?
Posted on: 12/14/2008 9:15 AM by Author "skyjockey" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8244135

RE: Chord line confusion
For some reason the picture will not upload. This is the best I can do. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930081042_1993081042.pdf Irregardless, which do you suggest I use, keeping in mind the 0 degree AOI called for? Do I interpret as something like 2 degees +AOI in reality and leave it as is? In the PW drawings, the chord line-datum line of the airfoil is parallel to the thrust line-datum line of the fuselage. But copied drawings are just that and are prone to error. What to do, what to do???
Posted on: 10/8/2008 1:59 PM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8030367

Chord line confusion
The data I recieved from the NTRS site shows the profile of the airfoil section sitting on a line. The ordinate chart uses this line as a datum line , but calls it the chord line. The Peter Westburg drawings, which were copied from Grumman drawings, I have of the aircraft do the same. The ordinates define the LE to TE chord line not parallel to that datum line (of course higher at the LE). Now the legend in the PW drawing calls for 0 degrees AOI. Which do I use?
Posted on: 10/8/2008 11:38 AM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8030056

RE: Zero speed landing possible ?
Posts: 65 Joined: 9/18/2008 From: England, UNITED KINGDOM Status: offline Hi guys, thanks for your quick replies. I guess that making anything akin to a helicopter, with rotors in all directions feels a little bit like cheating. What I had in mind was more of an Airplane which can do a zero speed landing. Perhaps more like a bird. Hasn't this thread gone far afield from the original premice?
Posted on: 10/6/2008 5:32 AM by Author "skyjockey" in the forum "Aerodynamics"
http://www.rcuniverse.com/forum/fb.asp?m=8022954