I want to buid a Top Flite P-47 Golden edition. Instead of the usual glow 1.20 engine, I would like to fit a gas engine .
What size should it be? Will it fit in to the cowl?
Can it be done?
(I don't want to build a giant scale...)

THNX for helping, Vasek

The only engine I know of that might be a good match is the RCS 140 from www.rcshowcase.com. That's what I'm putting in mine. I wish it was completed already, so I could tell you exactly how it does. I've attached a small picture below, and more are available on my P47 page:

http://astro.umsystem.edu/andy/rc/p47/

Andy Steere
Mid-Missouri R/C Assoc.
http://astro.umsystem.edu/andy/rc/

Worth considering. I have a krunning thread with lots of info posted in the Giant Engines thread.

Bah! Here's a direct link.]

For good (not over powered) i would put a 35-40cc gas engine in it.
Zenoah is a good name

www.horizonhobby.com

A 35-40cc gas engine would NOT be a good choice for the .60-1.20 sized P-47. BalsaDuster must be thinking about the giant-scale P-47, not the one that runs fine on a 0.75ci glow engine.

The MVVS 1.6 is an interesting option, cheaper too. However, with its stock muffler and carb, it is heavier than the RCS and will NOT out-perform it. 8,200rpm's on a 16x8APC, tuned down to 8,000 to avoid overheating? The RCS will do >8,800rpm straight out of the box.

With a much better muffler or a tuned-pipe setup, the MVVS kicks the RCS's rear (even more so with a modified carb that voids your warranty). As it should... being a bigger engine and all. A great thing on a 1/4-scale aerobatic ship... but on a 1/8th-scale warbird? The RCS is already way more power than the P-47 needs. Also, if you live in the USA and buy your MVVS from overseas, guess where you have to send it for repairs or to get parts? Morris Hobbies, the USA importer, doesn't list the 1.6... I wonder why? I sure would like to play with one (I love my MVVS GRRT)!

In any event... either would be better than cleaning glow-puke off your plane! (just my opinion, of course...)

Andy Steere
http://astro.umsystem.edu/andy/rc/

Okay sorry but would the Zenoah G-23 work for him?

this engine produces the power of a 1.20 glow but is is slightly heaver.

this might work

These scale birds are already heavily wing loaded. More weight is not gonna help. These are .60-.90 size planes and 1.20s are not bad but already kinda pushing it already. The RCS 140 seems a good fit and is very lightweight. The MVVS 1.60 is a bit heavier and might work. Any of the Zenoah would be way too heavy. G23 weighs over 50 Oz. while most 1.20 are in the low 30 Oz. range. One lbs is a lot of different in a plane this size and type.


About the MVVS being sourced overseas, unless one lives next door to Morris Hobbies, any warranty service work and parts would be obtained through the mail anyway. These days, shipping charges are not too much different whether it is 200 or 2000 miles away. I wouldn't fret it if there's a substantial amount of savings involved.

Excellent point about Morris Hobbies... great guys, but they are not known for fast turnaround. <grin> I was thinking more of RCShowcase in Maryland. I *MAILED* them a parts-order the Saturday before Christmas (to replace a spinner-adapter that I stripped with a too-long spinner bolt). They got the order the Thursday after Christmas, and I got the parts that Saturday (basic priority-mail). One week from putting my order in the mailbox to having the parts... including a national holiday... and I live half the country away from them. Not bad.

I get the urge now and then to buy a 1/4-scale aerobatic model... but then I stop and add up what a 33% H9 Cap with a ZDZ80 would cost. Not all that much more expensive, but harder to transport. Anyway... if I give in to the urge for a 25% ship... I would put a MVVS 1.6 gasser with tuned pipe in it before ANY glow-puker. (Like my new name for them? Don't worry, I'm not becoming an elitist... I own and love glow-pukers too.)

I have yet to find an aerobatic ship that is a perfect match for the RCS140. I was hoping the Aeroworks new little Edge would be that airplane, but its too small and builds nose heavy with a 91 4-stroke. The RCS needs an Edge/Extra/Cap that weighs 8-9 pounds with that engine, has a 66-69" wingspan, and normally builds a bit tail heavy with a 4-stroke.

Andy Steere
http://astro.umsystem.edu/andy/rc/

Couldn't agree more about the "glow pukers". I love 'em in my <120 size planes, mostly because there are no gasser that small. But the thought of cleaning 1/4 and 1/3 size oily mess is just too much. It doesn't help that I like to run full castor or generous castor/synthetic blends. Your engines lasts forever, but you also end up cleaning forever, too.

Maybe another option would be to convert a 90
or 120 glo engine to ignition. I think I saw an
article in MAN magazine a couple years ago
converting a ST 90 to ignition. I believe Nelson
Hobbies?? sells the conversions but I am not sure
how cost effective it would be in the long run.

Good luck
Sam

Vasek;

The RCS 1.40 is a superb motor the wieght to power ratio is equal to 50%-75% of the 1.20's currently on the market. Second Plus for Gas is that you only need an 8 Oz Tank in your Aircraft for 15 Minutes of flight. Thus you have just equaled the Wieght of a 1.20 and a 20+ Oz tank of fuel.

The RCS turns a 16 X 8 APC @ 9100 RPM Static Thrust is about 16 Lbs.
Engine Weight with Muffler is 2 Lbs 5.Oz.


Engine RPM with APC 16x8 prop

RCS 1.4, one gallon through it, small carb 8,500 @ 66F, (8700 @84F)

RCS 1.4, 1+ gal, large carb, and TT 1.20 muffler 9,100 @ 70F

YS1.20NC with 10% nitro, well broken in 8,500

TT1.20 Pro, 5% nitro, one gallon through it 9,000



Hope this helps

Thanks to all your posts, I am a smarter man now...

Special thanks to Andy and Jack: your expertise is appreciated!