Anyone tried a conversion engine in a Sig Rascal 110 ? This is a big plane and light weight also. I have a 31cc Ryobi and a Homey 25 that might be candidates.

Richard

Mine is sitting on the shelf waiting for a gas engine. I've got several conversion engines that come close to perfect for it, but... not quite. The little Echo 25cc weedie fits great on the firewall and has just about right prop hub distance, but the darn muffler sticks out of the cowl. I saw one with the B&B muffler sticking out the cowl cheek and it looks aweful. The Ryobi fits enirely within the cowl, but I will have to perform majoy firewall surgery to clear the rear muffler and rear carb.

Any ideas?

My Ryobi 31cc with the rear mount from Jag Engines is too long to work with the cowl. I read where one guy was going to extend the cowl to make up the difference which might work OK. I have read where the 25cc Homey is a good engine a makes as much power as the 31 Ryobi but it has carb and exhaust on the sides [&o].

Richard

The Homie 25cc makes about as much power as the older single-ring Ryobi 31cc. The newer twin-ring Ryobi shown in the pics above makes quite a bit more power. I will only recommend the Ryobi if you cut the firewall so that the carb and muffler are recessed behind the firewall. I personally don't like the idea of extending the cowl. It will cause balancing problems, especially if you keep the magneto. And it screws up the nice clean lines of the Rascal, which is why I bought in in the first place.

I've got a Homie 30cc, which is almost identical to the 25cc, in a Super Decathlon. It is physically even larger than the 25cc Echo in the above pics, so you'll have to cut the cowl even more.

I am thinking about gutting the 21.1cc engine out of my Echo blower. It's the same as the FPE 21cc shown in the Rascal 110 manual, so it should fit a lot better. I've been wanting a blower with more power anyway (insert Tim "the tool man" Taylor grunt here).

OK guys I am thinking about the same plane after seeing one at a fun fly this weekend but it had a glow engine on it and I want to put a gas engine on it and want to do an engine conversion so which engine are you guys using.

I am planning to use a Honda GX25 on a Rascal 110, but I just saw that Honda came out with a 35cc version of the engine. I might wait until that becomes available. By the way, for anyone who flies a Rascal 110, how heavy of an engine do you think could be used on the plane without it becoming too nose heavy?

Charlie

Good luck fitting a cowl around it...That big oil reservoir and dip stick on the bottom and the carb way up on top would [8D]not fit, and you probably can't mount it inverted...I would go for a converted Homie 25, 8400 rpm with a Mejzlik 18-6 and a pound or more lighter...$49.95 from the traveling Cummins tool show...

Hello RCIGN,
I plan to leave the cowl off and mount the engine right side up. I think it'll fly ok without it. Wouldn't use the Homie - I want a 4-stroke.
Cheers, Charlie

I almost always leave the cowls off and mount the engines right side up too..
I had a bunch of new cowls in the attic, the planes they came from were long gone.

To Any-one Whats the pros...and... cons.... of up or down mount with engine? Thanks Capt,n

I just gotta know! Who has a G-26 in a Rascal 110. Did you have to butcher the cowl? Got pic's? I want one with gas power but, I am not paying the price for the F.P.E. so I can keep it under the cowl!

Thanks,
Pat

My Vote is on the Ryobi...
A little hole in your firewall to let the carb breathe and access hatch from the bottom....no holes in your cowl.
Just two "fangs" of exhaust stacks out the bottom....

Good Luck! Post pics!!

CrazyHerb

CaptinJohn,

In general, there are more incidences of plug fouling with the engine mounted plug down. Also a little bit easier to flood the engine as the fuel/oil can puddle in the spark plug. Many people use plug down mounting with no problems however. Once the engine is running, no operational differences.

Good luck,
AV8TOR

Volfy: As pictured above, what are the dimensions of the muffler on the Echo? Source?
My Echo 21.6cc exhaust deflector from 1.08" OD sq alum stock measures 2 7/8" prop c/l to end of bolts. Carb side is 3 7/8" with stock carb spacer.

What is the inside cowl measurement for everyones reference?

Mike, the muffler on the Echo 25cc is a standard B&B muffler. I will take some measurements, including the cowl insides, when I get home tonight.

The firewall has the right thrust built-in, so the engine centerline is offset to the left (as viewed by the little pilot in the cockpit). This means that, regardless of which side-exhaust gas engine you pick, there is very little room between the exhaust flange to the cowl cheek. I may end up using a header pipe (pictured here) going into a flex pipe and then a can muffler. I just don't like a big ol' muffler poking out of the cowl cheek on this one.

The B&B muffler body is around 2-11/16" x 1-3/4" x 15/16". The stingers are 1" ID. I think B&B makes several different sizes, but these measurements are typical for the small gassers.

The Rascal firewall height is 7". The width is 4-5/8" on the outside and 4-1/4" inside the two extensions. The cowl obviously tapers toward the nose and so is kinda hard to take measurements.

Here's some pics of my Rascal 110 with a G26 mounted -- I have not put the cowl on yet as I am waiting for the pitts muffler to come in. Looks like a good majority of the right side will be opened up for the carb assemble to stick out, and from the measurements I took off a friend G26 with a pitts a small section on the left will also need to be opened up, but not near as much as the right side.

...My customers really like the Rascal/G26 combination. A 17-6 prop works great with the stock muffler, you'll get 3 or 400 more rpm with a Pitts muffler, try an 18-6 or 17-8 prop..

sig rascal 110 wing set for sale on ebay

I have been flying mine with the Honda GSX31. The GX25 would probably fly it just fine and be allot easier in terms of fitment and balance. The downside of the GX31 is that you need the servos, battery and about 1 Lb of lead in the rear, and of course the stock cowl is out of the question. The upside is that there is ample power and although the engine does change the looks it is not an unpleasant appearance. I have really lost my love of nitro and all of it's vaugeries and mess and embraced electric. In many respects the GX31 on a rascal is like an electric in that there is no mess, no tunning issues but you don't have to spend a grand on Lipos and a huge AXI. This combo really brought me into giant scale gas and 4 strokes in specific. 4 strokes are becoming more common and more powerful in yard equipment and I don't see myself flying much other than that, and electric, in the future. The GX31 and yardmachines are 1st generation and have proven to be good engines with the right airframe. The coming generations will most likely be more suitable for a wider variety of airframes. I have a few projects that I have put further down the queue such as a TF 1/5 mustang in hopes that suitable 4 strokes will be available. What surprises me is Fugi coming out with that 4 stroke that isn't any more powerful that a conversion and can't be mounted inverted like conversions, for the price of $800.

I need to being a cameraman to the field with me to get some shots of it flying, here is a short shot of the engine running: http://www.subarubrat.com/misc/MOV01407.MPG

Subarubrat suggests that the GX25 is a better 4-stroke solution for the 110 than the GX31 (or presumably the new GX35). Has anyone out there actually run a GX25 on a Rascal? Sounds interesting to me.