RE: Small Conversion Engines For This Twin?
 

same goes for my little fokker dr1 it was my dream plane and I only fly her once a year, other wise it is the only indor pet of the prop kind hanging from the ceiling in the living room.

AERONUT I called them to get a few to try and they dont even have them, they just put them on there to see if there was any interest, so everyone needs to call and tell them you need 10 thats what I did so call ;) maybe if enough of us call they will get them.

Darin

RCIGN1 is that ready to fly with ignition, battery and muffler?

the little echo will work nice also

RE: Small Conversion Engines For This Twin?
 

Aeronut I dont think you want to run a engine clockwise unless you have a left hand thread;)

Darin

RE: Small Conversion Engines For This Twin?
 

Bn120..Nope, engine and ignition only..Doesn't take much battery, current draw is 150-200 MA at WOT..Haven't weighed a muffler, there are too many out there...

RE: Small Conversion Engines For This Twin?
 

This is interesting, I always liked this Aircraft, the full scale version, except for the hot running problems with the rear engine. The size of this model aircraft suggests that the wing loading is going to be a big problem. If it was sized for two .45 glo engines and they don't give the wing area or the wing loading, I would email them and ask what these two specifications are. Knowing these two numbers will help a lot in evaluating the possibilities of the project. I would guess that at 13.5 pounds this airplane doesn't have the lowest wing loading to begin with.
John

RE: Small Conversion Engines For This Twin?
 

let me suggest something in a slightly different direction. I chose to use an SPE 26cc in my Gp GeeBee which weighs only 2.5oz heavier than an OS Surpass 120 4 stroke glow. The less glow in my life the better. What I would do in your case is to install a dummy prop in the rear free spinning on a shaft on ball bearings. Stuff all the RX, pack, servos etc. as far to the rear as they will go and then run that SPE 26cc in the front. It puts out 12 lbs thrust. Two OS 70 surpass 4 strokes (within reccomended range) weight 44.1 Oz, with the one 26cc gasser it will weigh 6 oz LESS than with the two glows. It should fly nicely on that. As soon as that first engine fires the rear prop will be spinning. Other engines are available such as the 40cc version of the SPE26 which puts out 18Lbs thrust and weighs .8 lb heavier than the 26cc. No doubt that would be a FAST plane with all sorts of nice short field takeoffs like it did in Vietnam. You could go with flaps and slow the landing speed down too. Think about it this way, two OS 70 surpass engines that fit their reccomendation weigh in at 44.1 Oz, the 40cc SPE weighs in at 51oz. That gives you about 1/2 Lb more weight than the two glow engines and that would be easily dealt with. I think you can have your cake and eat it too. And let's face it, for less money and less hassle.

RE: Small Conversion Engines For This Twin?
 

Not a bad idea.

But, I WANT twin engines. I've only had 1 twin, and it lasted about 2 minutes--and then somebody turned on a TX in the pitts. SPLAT!!

I talked to Scott, and he's got a couple real small gassers that he's been working on. He said they would weigh 2lbs if I run them as a hybrid on glow/gas with no magneto and a glow plug. Thats cool--nice and light--but I'm trying to get away from glow fuel. Like Subarubrat said, "The less glow the better." I think Scott said his small weedies would weigh about 2.5 pounds with electronic ignition. Don't quote me on that.

Ralph mentioned his G23 engines, and I'm interested in those too.

I think with 87" wingspan and 13--14 pound flying weight, this plane will NOT be overloaded. I think it's going to be just fine. I've got aerobatic planes that weigh 16+ pounds with 87" wingspan and 1250squares. They will hover with a G62, and fly very light. I'll bet this plane has at least 1100squares. At 14 pounds, it should be fine. It could very well have 1200 or 1300 squares. I intend to contact them this week and get some info about the wing area.

I know that a couple 1.20 glow engines (remember, my altitude is pushing 5000') would be the lightest thing to do. But, thats no fun, and expensive to fly. Can you imagine the fuel bill to feed 2 x 1.20 glow engines? [:'(][:'(]

Gotta be gas, or not at all.

CMP just released a bARF Skymaster with 81" wing for around $225--$250. Thats cool for a couple 46-60 glow engines. But, it doesn't look like it has functional rudders.

I'd rather build a little bit bigger kit myself, and customize it to my taste. Probably cost me $500 for the airframe, but I still would rather build it than buy a smaller ARF.

RE: Small Conversion Engines For This Twin?
 

The Hybrid Gas /Glow uses 1 part glow fuel and 2 parts 91 octane gasoline with a glow plug and no ignition parts, that's why it's called a hybrid

RE: Small Conversion Engines For This Twin?
 

Pretty sure buying CH ignition is more expensive than removing all mag & ignition parts and put glow plug in.
Last time I looked ign, sensor, & sparkplug weighs more than .... nothing, no sensor, glowplug
but you have to add a quart of glow to a half gallon can of gas

lighter is better, stripped is lighter

RE: Small Conversion Engines For This Twin?
 

@*$&@! %$*#(%&ing %$@@#$ it, I think I just talked myself into my next project. Ever since I saw Bat21 I always wanted to build a skymaster, and that 40cc on that thing makes me grin.

RE: Small Conversion Engines For This Twin?
 

A pair of my BCMA-SPE26 engines would be a really sweet combo for this plane. They weigh only 38 ounces each with the ignition module and have the power equal to my Zenoah G26. They are really close in physical size to a Saito 125 but they will have more torque! Auto Advance Electronic ignition is included along with engine mount standoffs and for $500.00 for the pair shipped, you will not find a better deal. JStanton is working on a review of this engine on a CMP Super Chipmunk.

www.bcmaengines.com

RE: Small Conversion Engines For This Twin?
 

Speaking of such, I haven't recieved my SPE26 yet, is it on the way? Can't wait to fire it up in that GeeBee. Thanks much.

-Scott S in VA