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Cool
RCGF Aerovate 40cc twin
Hello All,
Not wanting to brag, posture, claim I made a good purchase or bad, just wanted to share findings about a 40cc twin to either help someone not choose one or who knows share the next great thing. That said, I'm stoked, twins are sweet! Anyway, I've put an RCGF 40cc twin on a Pilot Yak 54 73", a '30cc' plane. So far so good I think. Ran today for first time, without cowl, and so far it looks good, with a single tank of gas through it. Started like its had many gallons through it, the recommended needle settings were right on, just a bit rich, as desired. Very low vibration compared to the singles I have and a good idle already. The setup is: Pilot Yak 54 26% AR12100 Powersafe RX, two 2100mah LIFE batteries 7955s on ailerons and rudder 7975s on elevators 5485HB on throttle, using pull cable Wike ignition power from rx Spektrum DX18 Fiji water bottle gas tank, crap-trap filter Using the two big-for-this-plane batteries because I'm nose heavy; auw is 11.5 lbs, so a pound heavier than I want. No spinner or spats. Using 19x8 Xoar for breakin. Quite a bit of baffling so that is not helping balance but necessary I think to help the engine be cool. Will run with cowl tomorrow and IR head temperature to see where that is. I'll get some photos if there is much interest in the details, for now really just want to relate a possible engine choice for the ever-growing '30cc' size planes. Like, they seem to get physically bigger and bigger. RCGF claims 4.6 ponies max, my guess is that is with pipes of some sort, I'm using the stock mufflers. |
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You guys are so visual. Cowl is on the plane and will get head temps AND some photos very likely in a few hours. Remind me to take the rpm thingie.
Plane MIGHT maiden this weekend. Curiously I don't have maiden-itis but sure would like to put this project to bed. Been a struggle from the getgo. What I SHOULD have done was get photos before the cowl went on. PIA to remove the cowl because the plugs must also be removed- she ain't pretty, but I think plenty cool. Did I mention low vibration? |
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Well... cowl on test not so good. CHT >240F so I stopped- crazy to do that on second tank of gas. I'm thinking this will be fine in the air- any thoughts?
The attached photos don't show the airflow arrangement worth a flip- I'm fairly confident that air will move through ok. Maiden should be this weekend, perhaps tomorrow. The kitten was acquired about the same time as the build started. Plane has already outlasted the cat. Corona virus. She is immortalized here. Sorta. |
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Joined Sep 2012
625 Posts
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Sorry for your loss. This is my little helper...
Crazy eyes! |
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Two thumbs up
So... maidened the Pilot Yak54 RCGF 40 twin. First flight was technically just the second tank of gas. Plane is nose heavy as expected.
Following few flights gradually leaned it out. Still running the 19x8 breakin prop, a bit on the rich side still. How's the 11.5lb Yak go? Like a homesick angel. Gobs of power, ok idle, NO lean/rich sensitive orientation behavior. There was no indication of overheating and no flameouts. Smooth throttle response. A great balance between raw power and low-idle reliability. Vibration is higher than expected which may be the prop; I'll get a real prop on there and see. Seems that the high strung engines like the DA60 and OS33 make crazy power but have poor idles and/or funky midranges- the RCGF40 appears to have only the crazy power part of that. IF it is reliable, a wailing engine. Even with the breakin prop makes IMO near the power of the DLE60 twin; I think this would be a great engine for any of the largish '30cc' planes. All that being said, I need about two ounces of tail weight on the Yak, and the paint is flaking off the cf main landing gear. The left main wheel was born towed in considerably so I need to do some cf grinding and fix that. Otherwise it is a really happy plane. Bottom line- great engine, hot rod vertical plane, tons of fun. Need to verify vibration with real prop, leaner mixture, and then gauge longterm reliability. |
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NICE!. Would love to have one on my Sbach but i'd have to mutilate the cowl. Btw, I think all rcg, rcgf engines have dual rings. I have a 20,26 and a 50, all dual ringed. Haven't had a single problem out of any of them that wasn't operator induced. Keep us posted.
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2 oz tailweight added; wheel no longer towed in- was about 10* towed in, other side is towed out a bit but leaving it. Should have caught the tow in before the maiden. Added silicone rubber inside the largeish gaps at the stabs/fuse joint since need tail weight anyway.
Not doing anything with the main LG paint flaking off the left side cf. There were no hard landings and paint coming off anyway. Pilot should have left the part unpainted. Not thrilled with Pilot quality- I'm certain I'd get flamed on for saying such if I did NOT own one. Not the case now. Not happy with the single fiberglass surface horns either- those should be doubled like Goldwing does and Pilot on the larger planes. REAL happy with how true the plane flies though! |
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update
Well, put a gallon through it, with a Vess 20B.
First, idle somehow changed radically (same batch of gas...) now very lean. Dunno if prop-change related. Learned long ago change ONE THING at a time, only difference this outing was the bigger prop. Fixed the idle... and not much change in max power... strange. Now all is otherwise ok, but when landing, the bump of a non-greaser kills the engine. If landing is smooth, a sharp right hand turn will kill the engine. Crazy sensitive some reason- dunno what is going on. After two gallons I think the engine is broken in. Fine idle and transition to max power; no sign of rich running in the air; max power (on pullouts and vertical climb ability) now merely 'good' IMO. Vibration seems less than before, about half or at most two thirds that of my worst 30-size single. Still not pleased with Pilot quality- both ailerons are badly warped. Only way they get that way is if they are built that way. Can only take out the warp temporarily with the covering they used. The added tail weight puts the balance (dry) about 3mm behind the wing tube. Knife edge spins are hard to enter or maintain- methinks the stab/elevator are undersized but dunno. |
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United States, NC, Wilmington
Joined Nov 2010
817 Posts
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sounds like you might have a little trash in the carb have you checked the screen
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