RCGF 20cc twin boxer engine first start 

nice getting ready to start my 56cc single cylinder real soon just a heads up gas engines can bend the connecting rods when they are bolted solid to a stand mainly the single cylinder they recommend only starting the first time on the plane due to it allowing it to freely move when vibrating but nice job looking forward to hearing mine

Well first off .. I am a retired heavy truck / equipment mechanic.. second.. it was only on the test stand for the video.. next.. there is very little oil comes from the exhaust.. and what oil did come out.. would most certainly not cause a problem even if the engine had been left inverted.. most everybody runs their gas engines inverted..

It is mounted on my goldberg ultimate 57 inch , take off weight is 10.5 lbs.. 16x8 prop and does about 85 mph

This engine is going on my 1/4 scale Sig Cub.

You have to remember that I am running this engine in my shop.. so the sound echo's .. At time index 6:25 you will notice that I add the silicon muffler extensions and it softened the sound a bit.. you could try adding longer versions which would change the sound.. once out in the open at the field.. it sounds ok to me.. and in the air ,, sounds ok.. but if you are looking for that 4 stroke sound... then I doubt it very much..

Maybe leaf blowers are trying to sound like this. At least that's what I would like to think😆

lol... well lack of understanding.. the fact the engine is upside down.. makes no difference... only which way the exhaust is pointed..

very little vibration.. nice smooth starting..

if you look at this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jQhZGJvcFMI.html you will see the 54 inch goldberg ultimate biplane on the right side.. the plane was 12.5 lbs and it flew pretty well.. I am a very aggressive high speed sport flyer and it did not have quiet the punch I wanted to I swapped it out for the 30cc version and now has unlimited vertical climb

@@jeffgrain1417 I’m building a Vintage 100” OK Big Rainbow, big n slow lol. Calls for a FT-120 and I’m thinking a 20 is probably enough, I’d like it to fly pretty scale. Not sure what I’d gain on the twin other then coolness they appear to be the same HP. Did you sell the twin?

@@paulhootisn848 The FT-120 is a glow fuel engine.. and will use a lot of fuel.. the rcgf 20cc is gas and uses very little compared to the glow.. the twins look and sound cool.. but they also have less vibration.. I had a 17x6 prop but a 16x6 would likely be a better choice for a slower plane.. not sure what this big rainbow is ,, but if it is like a cub style.. the 20 would be likely very scale.. but keep the weight down to about 10 lbs.. I didn't exactly sell it.. a buddy was stuck for an engine and he made me a deal I couldn't turn down.. trade the 20 for his 30 as well a 15 for a 15 to fit his plane and I did all the install and setup.. and yes the maiden.. so that I handed him back a flyable plane..

@@jeffgrain1417 thanks. Yes it’s like a giant Cub. 👍🏻

well they didn't exactly engineer it that way.. that is a standard warbro carb design.. fits pretty much any engine.. you would normally use aftermarket arms,, two different arms ,, one a bit taller than the other to offset your linkage hookup.. just that the muffler gets in the way of a taller one... so I used two short ones.. and they run into each other.. so I had to shorten one..