I purchased a RCGF 26 cc gas engine. Is it too big and heavy for a Yak 54 90 size plane? I am looking to buy the Seagull plane.

Wing loading is always an issue when matching a plane and engine. No doubt a powerhouse can be fitted to a 2x4 and it will fly... but will it fly as the air craft was designed to fly? A reasonable place to look for that information is the manufactures suggested engines... most of those recommendations are well thought out and give a range from realistic to performance. Is the motor your contemplating in that window?

In a word, Yes it is too large and heavy for a 90 size plane.
You need to go to a 120 size before you start looking at small gas engines.

Some people have had good luck with a Zenoah G-20 in that airplane. Not sure how your 26 compares in weight. so is it technically doable? Probably. Just be aware that it could really affect wing loading and balance. Balance can be fixed but higher weight and wing loading aren't so easy to get around. It might fly but be a lot less fun and more difficult.

I'd compare the weight of the recommended glow engine for that plane to your 26cc gasser and decide. Don't forget to factor in the ignition unit, ignition battery and extra switch for the gasser.

Also, I'm sure you know this and it might not be an issue but since this is a beginners forum I'll put it out there. The Yak is a pretty advanced plane, definitely not something you want to start out on.

How about a Great Planes Extra 300S 1.60?

how much fight time do you have on a trainer, second, maybe even thrid plane?
that is at the very least a third plane.
if you need a 120 sized trainer im sure their are a few out their
http://www3.towerhobbies.com/cgi-bin...?&I=LXCXT9&P=0
maybe?

Given the weight of the 1.60 extra, you would need a 35-45 cc engine for good aerobatics. but again this would increase the wing loading
and make the plane less fun to fly. The Great planes Patty Wagstaff is only a bit bigger and many people use a 50cc in it. The 1.60 glow
engine is alot more powerful than a gas engine of the same size.

I have one of these http://www.cermark.com/products/Cerm...%25-YAK54.html in my basement
still boxed. it is designed around a 28cc engine. I won't start the build until my 50cc plane is completed.

I've got one of those Cermark Yaks with an MLD-28 and it is excellent. One of the best deals out there in my opinion.

I've also got the GP 27% Extra-330 with an RCGF 50cc (sort of a DA-50 wannabe engine) bolted on the nose. Hoping to maiden it on Saturday. A nice 50cc engine seems to be popular for that plane. A good 40cc-45cc would fly it good. I've got a GP 25% Sukhoi which is just slightly smaller than the Extra with a Fuji-43 and it flys excellent.

All that being said, none of the planes I mentioned above are good for someone just starting out. If you try to start out with one of them or something similar you'd better have a lot of trash bags for the wreckage and a fat bank account to keep buying more. If you really wanted to start out with gas, maybe something like this? http://www.amr-rc.com/index.php?path...trainer26_info

Never seen it or have any experience with it myself.

I have been flying over a year now. I have a Hobbico trainer, a Ultra Stik, and a Cherokee which I have not flown yet. I have had a few crashes. I flew a Yak 54 on a buddy box, but I did not land or takeoff. Maybe I would be better off with the Sig.... man that is a big plane!

Think of this when you're converting gas engine size to glow engine size...10CC is equal to a .61. So a 26 CC gas engine is equal to a 1.58 glow

The displacement conversion is good but you also have to remember that the gas has about 80% the power of the glow at the the same displacement. Power to weight you cant beat glow; power to consumption you cant beat gas. You just have to find your personal crossover point where performance and economics are right.

A few planes you might want to consider if you want to go gas are maybe a Sig 4-star 1.20, a GP giant Big Stik or a giant Super Sportster. Those would be more in line with your experience level. There could be other options out there too but those are all I can think of off the top of my head.

I do not plane on flying the gas one right away. Just want to take my time, get more experience before I step up to a 3D plane. I really like the looks of the Yak size 90 though. How about the 20CC. Would that be a better engine for these type planes

Hey ChuckW....what are your thoughts on the MLD28? I was looking at a similar set-up as yours. Was just wondering as this would be my first gasser and dont really know much about the differences between them all.

The MLD-28 is great considering the price. I don't think it is on the same level as something like a Zenoah but it is still very good for the money. I'd definitely buy another. Of course, I've only owned 3 gassers so I'm not sure how it compares to everything else out there.

How does it perform considering the weight of the Cermark plane. Is it able to pull it well for good 3d?


Thanks!

I am not the greatest 3D pilot. I play around with a maneuver now and then but that's about it. With a Xoar 17x6 it does climb very well and seems to handle what I throw at it well. The finished plane is actually prett ylight.

I believe there is going to be a review of the Cermark Yak using this engine here on RCU in the near future, I'm sure it will be tested well.

I also think there may be some other threads on it around RCU.