RE: o,s, 32 max
[quote]ORIGINAL: combatpigg Sorry guys, but I've listened to a lot of speed passes over the years and what I come up with is about 170 mph down wind and about 140 mph up wind. The up wind passes the engine bogs down to about static rpm and heading down wind it spools up to about 25500. It is not feasible for a .35 to be able to turn a 8x7 well enough to do 190 mph. I looked at the laps from 1:29 up to 3:20 and the down wind passes were pretty consistent. The upwind passes ranged from 123 mph to 147 which tells me that the wind was variable. The truth is this... on a calm day this is a 155 to 160 mph set up measured over a distance of 600 feet. A far cry from 190 mph. [/quote] I Agree. -But- AirRaptor has freely pointed that niggling data accuracy stuff out too. those of us who are discerning, saw all that right from the start when he posted that video years ago.... Still, I haven't seen a faster LR-1. AirRaptor"s doin' alright C.P., and he keeps gettin' better faster than his (sometimes know it all tone) would lead you to believe. he is one of the few [i]VERY[/i] good ones, he has tremendous potential; And I [u]care[/u] about nurturing that potential. I am more proud than words can say, of you CombatPig, for comin' back to this thread and (hopefully) giving him a chance to calm himself: [i][size=1]and maybe even stop taking implied credit for accomplishments that are not his[/size][/i] Now, as for you AirRaptor, humble yourself before me, for I am the light, and the way..............................
Posted on: 6/14/2012 11:16 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11118817

RE: o,s, 32 max
Umm,............ Uhh,............................. Ahem,...................................................... Group Hug?
Posted on: 6/13/2012 8:53 AM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11116792

RE: o,s, 32 max
Dang! where did they put the popcorn eatin' smileyface? Airraptor, don't worry, 'Pigs just bein' hisself. Its like you said, he didn't [i]really[/i] say anything in his post that [i]meant[/i] anything anyway; So certainly nothin' actionable.... His whole post was just one big fat poo flingin' insinuation. Nuthin' really toxic in it, just poo....... I was really proud of the way ya jumped back at 'im tho', laughed so hard I almost blew ice cream out my nose. Anyway I like the poor bugger, I dont hafta wake up in the morning and [i]be[/i] him to get a lot of free entertainment from all the stuff his fingers spew outta his keyboard across the years, besides, truth be told his poo is laced with gold on occasion. And you CombativePig, (sigh), dont ever change, jes keep yerself [i]safe[/i], try to be nice, and go wash yer hands mister. Now, there's no way I can force you guys to shake and make up, but understand that if you two keep tusslin' and flingin', I am NOT gonna clean up after you! Chuck
Posted on: 6/13/2012 4:00 AM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11116518

RE: o,s, 32 max
[quote]ORIGINAL: BiggerDanno 9 x 8 will make it happy. [/quote] Respectfully disagree. A 9x8" prop Will knock it down out of it's best power band (which is 16k rpm & above), and make it run unnecessarily hot (an especially bad thing during break-in). Speedracerntrixie had the prop recommendation nailed, although it wouldn't really hurt [i]much[/i] to skip the 9x5" and go straight to the 9x6".
Posted on: 6/11/2012 1:14 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11114658

RE: Knowledge Quiz for Warbird wiz
R. J. Mitchell's Supermarine Spitfire
Posted on: 6/7/2012 10:58 PM by Author "C_Roundy" in the forum "RC Warbirds and Warplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11110871

RE: Knowledge Quiz for Warbird wiz
... Best Regards to you and yours, Chuck Roundy
Posted on: 6/7/2012 3:17 AM by Author "C_Roundy" in the forum "RC Warbirds and Warplanes"
http://www.rcuniverse.com/forum/fb.asp?m=11109740

RE: GP LITTLE TONI WITH DLE 20cc ???
difference....... Whichever you install, enjoy the Lil' Tony! Chuck Roundy
Posted on: 5/15/2012 6:38 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11082315

RE: Carolina Speed Rally...Again!!!
Sheeiiit, you guys got me so full of inbred redneck NorCal hick town pride I could just bust! [:D] Speedracerntrixie, no matter how long I live, I will [u]never[/u] forget the sound an 8 lb, fiberglass, "Mach 1" pattern ship makes when it hits one of the hollow steel light poles in the Solano college parking lot at about 110 mph. Its been 41 years so far since I saw that happen, and I can still hear it ringing... Propstryker, I actually got goose bumps reading your abbreviated but chock full account of Fairfield life back then. Its almost like we just took turns living the same life. In a nutshell[b]:[/b] control line (but with Torpedo .29 on [i]my[/i] RingMaster, at Mary Bird schoolyard behind our house, (a few blocks north of Anna Kyle)), WonderWorld, N. Texas drive-in, and Nike missile site on top of Cement hill, check check and big check (when we were little, me and my best friend usta' ditch our bikes at the bottom, sneak up the hill past the pissed off rock salt shotgun totin' farmer, and explore the old missile installation). I too once got thrown outa' Solano college football field, (but it uhh, wasn't for flying airplanes), etc. etc. etc. etc. etc. etc. etc....[i] Right Down The Line[/i]. Thank you for your thoughts about my father's safe return from 'Nam, (and all the other many thousands of Veterans who came back through Travis AFB). I am positive your dad damn well made them feel welcome back home, (unlike other large portions of the American public at the time) I salute your father and you [i]both[/i] for serving Sir! Regarding Nut Tree Airport, I too have very strong feelings for the old airport, and I too wish more locals would realize what an important county resource [i]and[/i] historic site it is! Besides being a military pilot, my dad held a civilian A&P mech. license and did all his own maintenance on his beloved 1962 Mooney that we kept there. Through the 70's, I spent hundreds of Saturdays on the ramp with my dad, restoring and maintaining it. We flew the hell out that plane, all over the continent, in every kind of weather, over and over. And we always made it home, exhausted, deaf, and happy, to Nut Tree. Dads been gone a long time now, but finally, all these decades later here I am back at Nut Tree 4 days a week, for the last 3 yrs, keeping my life long promise to myself, to take my A&P license too. What an indescribable privilege it is to be able to do it at the old airport where I learned to fly and work on airplanes as a boy. Most days I show up before school, just to walk slowly around the big ramp for a half hour or so, through the tied-down airplanes, watching others come and go, and letting my mind wander across the years...
Posted on: 5/14/2012 2:44 AM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11079945

RE: Carolina Speed Rally...Again!!!
[quote]ORIGINAL: propstryker No offense taken. Anybody from my old home town of Fairfield Californ-I-AY is OK with me! [/quote] Propstryker, I grew up around Fairfield too. At one time or another I've lived in just about every town in Solano county. My family came to Fairfield CA in 1971 when my dad got back from Vietnam, and was stationed to Travis A.F.B.. Fairfield (and lake Berryessa) were always my stomping grounds. I ended up moving to Sacramento for 20 odd years and hated living in a big city. But finally I moved back to FF 3yrs ago, just to go to A&P tech. school at Nut Tree airport, and to spend more time with my mom while she's still around. Fairfield is still a nice relaxed place, still windy all the time (great high speed slope soaring in the hills around the town). The S.F. Bay breeze really keeps it from being [i]butt assed[/i] hot like Sacramento in the summer. Your words help me remember not to take the good stuff for granted, and next time I get to rip diving downwind passes in a 40 mph wind, I promise I'll think of you, and all the other Fairfield prodigal sons. Salute Sir! Best Regards, Chuck
Posted on: 5/4/2012 1:00 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11068478

RE: Prop unloading.
[quote]ORIGINAL: Sport_Pilot [quote]ORIGINAL: C_Roundy Yup, effective pitch = geometric (helical) pitch minus slippage Helical / geometric pitch = distance that a given angular pitch, at a given blade diameter station would travel forward per revolution if there were zero slippage. Angular pitch... to learn or solve[/i], I'm done in this thread. Sincerely, and with Due Respect, Chuck Roundy
Posted on: 5/4/2012 12:58 AM by Author "C_Roundy" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11067852

RE: Carolina Speed Rally...Again!!!
[quote]ORIGINAL: airraptor yeah that looks expensive! loose cowl or engine? [/quote] Loose cowl, it [i][u]was[/u][/i] mounted on the Bear with 3 1/4-20 nylon bolts, and I had just torqued fresh ones in there during some maintenance, but it came loose right away anyway. The brand spankin' new, first out of the mold 15x17" prop I was testing is so extremely thin bladed that it may have some torsional vibration issues. We will home in on that, but I've been having trouble keeping the cowl tight all along. We're changing the way the cowl mounts while we repair it. The really cool thing is that because we have the mold that the cowl was born out of, we just bed it back in the mold, surface coat the corresponding damage area in the mold with resin pigmented to match the orange paint, put the cowl in, glass the damage from the inside, vacuum bag it, and were done. If you look close you'll be able to see the repair, but the shape will be dead perfect again, quick and easy. But I digress, Vicman, I shall cease thread hi-jackage activities commencing immediately.
Posted on: 5/3/2012 6:58 AM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11064951

RE: Carolina Speed Rally...Again!!!
[quote]ORIGINAL: vicman The big brown truck gets waayyyy better mileage.[:D] [/quote] Ya, sure, but I would be seriously tempted to accompany my airpain there flying it from a convertable Ferrari before I would trust the [b]b[/b]ig [b]b[/b]rown [b]b[/b]ox [b]b[/b]ulldozer. [>:]
Posted on: 5/2/2012 11:01 AM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11065607

RE: Carolina Speed Rally...Again!!!
Cruise range. 24 oz of 55% nitro gets me 4 1/2 minutes of motor run. [:-] How many refueling stops, with around 190mph cruise speed, would said transcontinental flight be?
Posted on: 5/2/2012 8:21 AM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11065416

RE: JFK shuttle Enterprise landing...VIDEO!
Here is a link to a thread with an AWESOME video riding along with the solid boosters. http://www.rcuniverse.com/forum/m_11056421/anchors_11056421/mpage_1/key_/anchor/tm.htm#11056421
Posted on: 5/2/2012 7:49 AM by Author "C_Roundy" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=11065375

RE: Carolina Speed Rally...Again!!!
[quote]ORIGINAL: vicman Somehow I think that might be a jab at NC??? Good thing I'm from Michigan.[:)] [/quote] Oh no! [X(] it's really [i]reeally[/i] not. I actually say that all the time to people that can't believe the performance we get out of the crappy plastic airplanes we make. Ask any of my friends, they get tired of hearing it...
Posted on: 5/1/2012 9:24 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11064965

RE: Carolina Speed Rally...Again!!!
Aww shucks Propstryker (kick dirt), Us inbred redneck Californians sure don't know much, but we aim to please... [;)]
Posted on: 5/1/2012 8:34 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11064896

RE: Prop unloading.
Yup, effective pitch = geometric (helical) pitch minus slippage Helical / geometric pitch = distance that a given angular pitch, at a given blade diameter station would travel forward per revolution if there were zero slippage. Angular pitch = degrees of twist at a given blade diameter station compared to the props plane of rotation. Slippage generally = 15-30% of geo. pitch. Here is a simplified propeller aerodynamics page representative of full scale ground school. http://www.free-online-private-pilot-ground-school.com/propeller-aerodynamics.html
Posted on: 5/1/2012 6:27 PM by Author "C_Roundy" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11064699

RE: Carolina Speed Rally...Again!!!
Way ahead of ya' Airraptor, we were out this weekend polishing our skill at shearing blades off in flight. I still need a little practice, but I'm getting the hang of it. [:D]
Posted on: 5/1/2012 5:44 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11064643

RE: Carolina Speed Rally...Again!!!
post doubled.
Posted on: 5/1/2012 9:48 AM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11063667

RE: Carolina Speed Rally...Again!!!
[quote]ORIGINAL: airraptor Roundy as you might know those herbie engines make just over 40 HP on glow. most run a 20x33 prop at around 10,000 or so maybe more. The latest trend though are the DA and ZDZ's in the 120-160cc range. they are lighter and run pretty close to the same speeds. I would like to go also but i cant make it. Maybe i need to see if i set up a mini speed rally at my club
Posted on: 5/1/2012 1:56 AM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11063666

RE: Carolina Speed Rally...Again!!!
[quote]ORIGINAL: vicman You have a few planes I would like to watch go by. I gotta warn you though, the lekkie guys come here with plenty of game.[:D] [/quote] Ahhh, I really do wish I could be there, I would load up for bear like I haven't in a long loong time, for the privilege of getting my azz kicked by said lekkie guys, [i]no matter how gamey they smell.[/i] [:D] I would see no honorable way around it! VicMan, I've followed the growth of your Speed Party from out here on the left coast since the beginning of your efforts, and to me, what you and your com padres have built up is the coolest thing since God invented nitro. bar none. Salute Sir!!!
Posted on: 4/30/2012 8:52 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11063519

RE: Prop unloading.
[quote]ORIGINAL: freakingfast [quote]ORIGINAL: Sport_Pilot [quote]''airraptor'' You run a large prop over square and the prop is stalled on the ground[/quote] Sorry but props do not stall just because they are on the ground. [/quote] I'm going side with airraptor on this one. You wont experience the phenomenon (prop stalling) unless you use a'' square'' or ''over-square'' prop. (diameter near same as pitch). Examples: 9X9,9X10 10X10, 11X11 11X12 etc. And it has to be turning a fairly high tip speed, so it may not be as noticeable on four stroke. When the prop is ''stalled'' you see wonderful tach numbers on the ground, Yet in flight, once closer to pitch speed, the prop gets a clean bite and the engine loads down actually turning about the same or less rpm than it did on the ground. IF the plane is very clean, it may pull past this point and the engine will then unload, but this is not the norm. [/quote] I'm going with Dub Jett on this one, who goes with freakingfast on this one, who goes with AirRaptor on this one. [8D] Good explaination freakingfast ! Blade angle of attack (static) is a function of pitch per revolution times rpm. And no matter [i]who[/i] whittles yer prop, in this universe its stalled past 15-18 degrees angle of attack at every diameter station along the length of the prop that experiences said stalling angle of attack. Example: When I prop the DZ-170 on my Rare Bear with a 15x17" narrow, on the ground = 9300 rpm, 60 mph = 8700 rpm, 130 mph = 9300 rpm, 200 mph =10,500 rpm. That is pretty much exactly what the telemetry that we have verified 7 ways to sunday sez as I slingshot through these speeds at full throttle. P.S. I am eternally grateful to Dub Jett for the patience to get the reality of what goes on when you prop a hotrod to the hilt through my thick, stubburn skull last century. It really was the turning point for me to be able to get my airpains haulin' azz........
Posted on: 4/30/2012 7:58 PM by Author "C_Roundy" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11063471

RE: Carolina Speed Rally...Again!!!
Hmm, I'm thinkin' the Herbrandson 290cc nitro & glow twin from my USRA Super Corsair, spinning an 18" x 66.6" propeeler, Jethro slapped onto an Ugly Stik with tall gear ought to do the trick. I promise to miss the fabric runway when I make my hole.... [;)]
Posted on: 4/30/2012 6:58 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11063385

RE: looking for fast electric
How much?
Posted on: 4/30/2012 6:37 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11063349

RE: JFK shuttle Enterprise landing...VIDEO!
[quote]ORIGINAL: Sessholvlaru Wow, no comments? Well I thought it was awesome... [/quote] I did too Sessholvlaru, I truly did. I sure have alot of mixed feelings about seeing the end of a glorious chapter in history though; no matter what the reasons. Regardless of that, thankyou [i][u]very[/u][/i] much for posting the video's ! Chuck Roundy
Posted on: 4/30/2012 6:24 PM by Author "C_Roundy" in the forum "Airplanes - Full Scale"
http://www.rcuniverse.com/forum/fb.asp?m=11063319

RE: Hacking a GP US40+ kit
[quote]ORIGINAL: C_Roundy Check your C.G., mark it, and start moving it back in [u]small[/u] increments. -SERIOUSLY, just do it- when you get it back to the perfect neutral, but still stable point, the airplanes slow flight and landing characteristics will be totally transformed. A properly balanced Ultra-Sport is one of the sweetest landing intermediate designs [i]ever[/i]. [/quote] [b]C_Roundy
Posted on: 4/16/2012 8:29 PM by Author "C_Roundy" in the forum "Kit Building"
http://www.rcuniverse.com/forum/fb.asp?m=11045102

RE: Hotser
[quote]ORIGINAL: combatpigg ...I've grabbed a running engine with a pair of channel locks at the upper cylinder and noticed an improvement in rpm. The engine was on a weak plastic mount. [/quote] Far freakin' out CP. That has to be the single most savvy, effortless, instant [i]setup optimization check[/i] I have heard in years. I am stunned that this simple and effective technique never occurred to me. Stunned I say, shocked, mortified, devastated, demoralized, depressed, and downright disgusted. I'd hang it all up and take up knitting or basket weaving from now on instead, but thanks to you, its clear to me now that I'd suck at that too, for all the same reasons. [X(]
Posted on: 4/16/2012 6:00 PM by Author "C_Roundy" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=11044877

RE: Hacking a GP US40+ kit
Check your C.G., mark it, and start moving it back in [u]small[/u] increments. -SERIOUSLY, just do it- when you get it back to the perfect neutral, but still stable point, the airplanes slow flight and landing characteristics will be totally transformed. A properly balanced Ultra-Sport is one of the sweetest landing intermediate designs [i]ever[/i]. I've seen the situation over and over for decades, where guys are flying their airpains noseheavy and wonder why they land like homesick anvils. (I was that guy once upon a time, until a [i]very[/i] good friend was stubborn enough to get through to me, and get me off my butt finally to take the time to trim my own fleet's C.G. to bring out the flying qualities they were designed for) It was a revelation to me, just how wonderful they could have been flying all along..... The suggested C.G., (or forward portion of stated C.G. range) in the instructions for the vast majority of kits AND arfs is just a safe, [i]conservative[/i] [u]starting point[/u]...
Posted on: 4/16/2012 5:22 PM by Author "C_Roundy" in the forum "Kit Building"
http://www.rcuniverse.com/forum/fb.asp?m=11044825

RE: YS120 weight?
http://www.ysengines.net/manuals-downloads/FZ110-YSP.pdf the 1.10 wieghs the same as the 1.15, (730 grams = 25.75 ounces) YS manuals give the weight of engine [u]only[/u] with no exhaust system (but with prop nuts and washer) Example of YS manual weight accuracy[b]:[/b] my DZ-170 weighs 957 grams on our FANCY digital scale, and the manual says 955 grams. - seems like 2 grams of assembly oil was used to me[;)] Either your scale is wrong, or your weighing your 1.10 with a muffler on it or something.
Posted on: 4/7/2012 9:21 PM by Author "C_Roundy" in the forum "Scale Racing"
http://www.rcuniverse.com/forum/fb.asp?m=11032515

RE: YS120 weight?
http://www.yspower.co.jp/en/data/pdf/fz120.pdf I just typed a search for "YS 120 manual", and it popped up right from the horses mouth. 880 grams = 31.04 ounces = 1.94 lbs. Whichever version 1.20 you have it will be similar.
Posted on: 4/7/2012 8:34 PM by Author "C_Roundy" in the forum "Scale Racing"
http://www.rcuniverse.com/forum/fb.asp?m=11032475