I'm looking at an EVO GX45 gas engine. I want some real life comparisons to the major players like DA50, BME50 etc. I plan on putting this on a GP 27% CAP. According to the book will probably weigh 14.5lbs. My elevation plays a factor at 4800'. I'm guessing a 22x8 prop but also looking for ideas on the proper prop.

This will be my first gas engine. However, since I fly YS I have absolutely no doubt I can tune any engine expertly. No problems there. Just interested in what others think.

Thanks for your input.

Barry Cazier

Hi Barry:

I was at this point a few weeks ago trying to figure out what my first gasser would be. I still don't know as I went the opposite way from you and went smaller and got a YS110! Ha ha. Anyway, there is a fellow on here whose name is Aerobob and he did a spreadsheet, located here: http://www.rcaerobats.net/GAS_ENGINE_WTS.htm which you might find helpful. I was thinkning that the Evolution 45GX would be very good, but everyone will have different tastes. Aerobob's spreadsheet shows that the weight differences between the 50cc classed engines are very minor when you consider the weight of the muffler and ignition system.

The new BME 55 soon to be released will have a significant weight advantage compared to these others in the 50cc class. That is providing they come out soon and you can get one.


http://www.rcuniverse.com/forum/m_37..._1/key_/tm.htm

Think it cannot be done? Just look at the BME110 compared to the 100cc competition.

Sometimes super light is not necessarily a good thing. It depends on the plane.
I have a QQ 85" Yak with a DA-50. If the BME 55 is lighter, the plane would practically never balance without adding lead.

Yep, he said a GP 27% cap.

Each plane is different. Are are you sure it would not balance with pull pull on the elevator or 1 elevator servo on long rods mid ship and a canister muffler on the motor? Maybe a little lead up front or heavy spinner?

The BME55 might have to be my 2nd Gas Engine. I'm not sure they'll ever get them in stock.

What kinda thrust numbers would I expect on the 50CC engines? Any advice on prop selection at my elevation?

This is a dumb question, but do the gas engines use a pumper carb and thus able to move the tank back to the CG?

Is this size engine too much for the 27% CAP?

Thanks guys,
Barry

If you buy a 50-55cc BME engine,skip any 79 inch airframe and try to get a 15-17 pound 85-88" wing Aerobat.

For a GP 27% Cap with only around 1100 square inches and designed around an OS 160, any 50cc engine, save the elusive BME 55, is super heavy, IMO, especially at higher elevations. P2W is one thing, but wingloading is equally important!!! But it seems that no one gets it or cares...I see too many planes like this with 31+ oz/sq.ft. wingloadings - my 102" 32% Yak has a lower wingloading!

This plane is designed to balance with an OS 160, which is virtually the exact same weight as a fully-outfitted BME 55, so balance would not be an issue.

Hi Barry,
Just my 2 cents FWIW as I did what you are doing a year ago. I decided on the DA 50 primarily as we have a local dealer (Troy Built) and due to the excellent customer support. My second choice would have been the Taurus 52 as my research revealed excellent customer support and no real complaints. I purchased the engine, Slimline Pitts, CF spinner and NX 22x8 prop from Gene at Troy Built. When I picked up the equipment, Gene was kind enough to drill the spinner and prop to fit the DA for me. This combo was installed on a Precision Aerobatics 84" Edge 540T. I have never looked back as the engine is easy to start, runs like a swiss watch and is much smoother that I thought a single would be. The plane will hover at about 1/3 throttle and is reliable even though it is still breaking in and slightly rich. I'm not even sure that I need or want to go to a 22X10 with this combo. Hope this helps ya .

if the gp cap is what your looking for the o.s. 1.6 is plenty of power. and is a lot cheaper. if your looking for wayy overkill put a 50cc in it. I would lean more towards a 40cc class engine. I have this plane with the o.s. other than the 2 stroke exaust notes it's a great engine. plane comes out right at 12lbs. for me a gas engine is a lot easier to 3d with than the 2 stroke but I'm getting use to it. here is a video of al lewis's cap flown by kyle woyshnis with the o.s. in it.
http://media.putfile.com/Kyle-3Ding-My-CAP-232

If you can get your hands on a BME44 that would be nice...but the BME55 is still the only gasser I'd put in it.

As I said, every plane is different. I get wing loading and I agree that is it is equally as important as power. Some of the 77" Goldberg Yaks with a DA-50 on them might have a huge power to weight ratio but when you cut the power the wingloading is too high to perform as the plane should.

The BME 55 is a good choice if he's willing to wait on one. They aren't out yet and I'm sure the waiting list is 5 miles long on it.

Hey Barry,
Finally getting one!!! Sounds like you are going EVO. It should be a great motor. Are you coming to the sod farm tomorrow?

Steve,

I'm gonna try to go to the Sod Farm. Sounds like a fun place to fly.

I think I am going to go with the GX45 engine. From all I can read this engine is the lightest except for the ellusive BME55, which may never become available. For now I've got the EVO GX45 on order.

Guys, I also am worried about wing loading. But the altitude here just kills the power. I went with the GP CAP232. It's only got about 1168 sq inch wing but it is pretty light. It looks like (from the book, anyways) that I'll be about 27oz wing loading. I hope that is acceptable. I don't see many airplanes that are 1300 - 1400 that are under 15 lbs. If they are more than 15 lbs then the 50CC engine class doesn't seem to be enough HP at my elevation. Quite the delima. Well, I gotta start somewhere. I suspect in 6 months I'll be a whole lot smarter.

Anybody know a 15lbs airplane with 1350 wing? I'd sure be interested to hear about it. Maybe that's the one I'd get.

thanks for all the input. It really helps with ideas and cuts the learning curve way down.

Thanks
Barry

Berry,
Take a look at the new Hanger 9 27% cap. I might put one of these on backorder. This looks like the ticket.

Steve

"Anybody know a 15lbs airplane with 1350 wing? I'd sure be interested to hear about it. Maybe that's the one I'd get."

BME Yak, QQ Yak, Airwild Extra 260 to name a few off the top of my head. You gotta whatch your equipment/hardware selection, though.

bodywerks...

Those are all nice looking planes. The wing loading doesn't seem much less, if any, from the GP 232 CAP. If those planes fly good at that wing loading...I guess the CAP will too.

I'm used to less than 20 on the wing loading so this will be a new experience.

Thanks
Barry

The WildHare 85 inch CAP 232 would be much better for a 50CC gasser than the Great planes CAP 232 IMO.

yes
fw3d 1400sqin + spe40 = 12lbs
thx

Hi all,
I'm ready to join the Gasser crowd....finally....been flying for 20 years, and have stayed away....since the EVO looks like a glow engine, I'm intrigued....and ready to buy "something"... This is the plane I've got my sights on: http://nitroplanes.com/extra300s140.html

Can anyone tell me if the EVO GX45 is the motor for this plane, or what else would you suggest?

I want it to have full 3d performance...ie. hang on the prop as long as I want, then hit the throttle and watch it go up up up...

Anyway, thanks in advance, and if anyone happens to know about the plane, please tell me what you know before I buy it....which will be tonight, I think, unless someone can give me a good reason why I shouldn't.

Next question: Who's got the deals on the engines you will suggest for me?

Thanks a lot everyone!

Mark

DO NOT BUY THAT PLANE! I had 2 and they were the biggest piles of crap.Covering will come off in flight , all the hardware is total crap , it weighs WAY too much for the size it is and its too small for a 50cc gasser .Check out cheif aircraft they have some plane/engine combos for 50 cc planes that are really reasonable.

just my .02
there are much better planes to spend your money on

Isn't this the same plane? http://www.chiefaircraft.com/rcmsec/...Extra300S.html

I think that plane is just too small for a 50cc gas engine. It only has 800+ square inches of wing area.

My experience with the Great Planes CAP232 with the EVO45 has been a good one. It certainly flys light on the wing. It's surprising how well it flys. I'd go with that plane. Mine weighs 13lbs 5ozs ready to fly less fuel. Performance is very good. However, for the same money and weight, I'd put a DA50 in it. I now have two DA50s and they definetely put out quite a bit more power. I'm getting over 24lbs thrust at my elevation with the DA50, and I'm only getting 20lbs with the EVO45. It flys the CAP very well and is a good fit. But it's the same price as the DA and the same weight, so I don't think I'll buy another one.

I also have a AirWild Extra 260 with the DA 50. It's a considerably bigger plane and I love the way it flys. But it costs a lot more than the CAP. If you want the least expensive "true" 50cc plane I think the Wild Hare products are the way to go.

But I wouldn't go with the plane you are looking at. Just my opinion.

Thanks
Barry

Whoa! maybe I was a lil' harsh , yes its the same plane IMHO its just towards the bottom of the barrel quality wise and it weighs way more than they say it does .Those lighter built planes made by more mainstream companies might cost more but they fly way better . Barry has listed some great setups but as you can see 50cc gasser can be a little expensive. Buy the best equipment you can afford .I tried to be kinda cheap building my first gasser and ended up buying some things twice .

Good luck with whatever you choose , once you fly a big gasser you'll never want to mess with glow again (at leat I didn't)



p.s.My friend has the Air wild extra 260 with a da 50 (same setup as my pete goldsmith H9 cap232g) . I flew it yesterday and WOW [X(] My cap in no way shape or form flies as good as that Air Wild plane. I think I see one of those or the new Wild Hare extra in my future