Help me out guys, I would like your suggestions. I have never flown combat but came into a RA Cores kit of the original Gremlin 25-40. I'm looking for an engine that will give me umlimited vertical but would be legal if I found a combat group somewhere. I fly at 6000ft in Arizona and build real heavy.

TIA
Bearair

A OS 25FX or Magnum 28 Pro would be legal in Class B, which is most popular in your area...

A group of us guys here fly RA cores gremlins with os .40 la'sI like the magum .36 and super tiger .40. We also have a smaller version, we call it the mini-gremlin ( only a 36 inch wing ) and have been using the MVVS .15. And they screem!!

Irvine.25 with an UltraThrust or Jett muffler.

You might want to try the MVVS .26 Combat Wombat. I mounted it on our 36 in. version, the mini-gremlin. It spins a 9 X 6 MAS at 16,000rpm. No radar gun but very faaaassssssssssst. Ask davesim. I know it will pull a full size 48 in. Gremlin with ease.

From experience I would have to say that the Magnum .28 XL with a mousse can muffler is pretty hard to beat,...especially for the money. The magnums are priced right and are very reliable and powerful engines. Thats what I fly on my Gremlins, and the mousse can mufflers will get ya from 1,500 - 2,000 more rpm.

Thanks,
FUZZ

If your group are using actual Gremlin rules, you must use a .25 plain bushing motor in stock class and virtually any motor in open. Saying that, the Norvel, although a lot of people don't like it, is the iron to put on the front- it seriously out-powers the other motors in that class.

JESTER

Find the combat group... then get the engine. Once you know the local rules, you know what you need.

The Gremlin is fun to fly on a .25... and a little rocket with a strong .46. Good airplane. We have a lot of them flown in our .50 ci max displacement club combat competitions. (usually with heavy reinforcements... which rarely save the things from shatering in a mid-air)

Mine is not legal but it sure is fun doing a low level pass at full throttle.

YS 45 for power.

Just not legal for RULEBOOK combat events... There are clubs running non-rulebook events (simplified) that simply say... no engine above XX displacement. (so they can set the safety line to meet safety code)

Those can be some of the most entertaining events. Watch a .15 power plane eat steamers from all the .46 powerd planes (and have no trouble dancing around them) then the behemoth gets mad... and dives through the little guy... dragging home a "spare" RX on his fin.[>:]

ysrcflyer, That grem looks like it would be nose heavy. Did you have a problem with that?

I use a TT.42gp,with macs one piece pipe.I am going to use at fun fly combat.[8D] I really like the way it flys.

I had a OS 25 on it originally. Not enough power for me.

I had to slide the fuse back about 1/2 inch to rebalance. Other than that no problems.

The tt gp 42 would be my choice because of its high power to weight ratio. Opening up the carb and muffler will let this motor keep up with most heavier ball bearing motors.

I flew Gremlins for 10 years(and still do)with OS.40fp's on them and it seems to be the best engine/power for that plane. They don't make the FP engines anymore but the TT.42gp is a clone of the old FP's. I find the bearing .40 sized engines are too heavy for that plane and take away too much of it's agility. I LOVE those Gremlins !

I agree with 1jimbo, I flew 2 with OS .40fp and they flew great, will fly a surprising long time on 4 ounces of fuel, longer than my dads with a Magnum .28, and if balanced right will glide like a buzzard, kinda looks like one too if you get it way up there. The .40fp will pull it straight up until it is outta sight, if you run an 11X5 prop on it it won't even slow down when you pull vertical. With a 9X6 it will fly fast enough, but isn't a rocket. I also flew one with a TT pro .40 with a tuned pipe, sounded like an INDY car on full speed passes, but had problems with flutter tearing the hinges apart, more fun with the .40fp, but not nearly as fast. I would sheet the wing before adding a .40 and tuned pipe again, if I did that tho, I'd thin it up and shorten the span just a little to go real fast.

Have fun

Austin

I use a .46FX on mine... It has enough power