I am looking at buying the above for an 80" scratch build project and would like to get some representative rpm numbers. Scott gives 7700rpm with an APC 18x10 for a new engine and he told me they typically gain around 300rpm with break in. But he did not have any numbers for bigger props, which is what I will be using. Does anybody have numbers for APC 20x8, 20x10 and 22x8 props, using the stock muffler and/or a canister system?


Thanks,
Mark

Well a 20x10 is going to put you high 6000 or right around 7000.

Its a powerful little motor but you dont put a 22x8 on a 40cc period.

Unless this plane comes in around 12or 13 pounds your 3D will be limited (if you intend to do any) if you doing basic acrobatic / IMAC stuff then you will be happy with performance even if you plane is around 15 pounds.

If you plane is going to be 16-18 pounds I would recommend moving up to atleast the 46 or the 60 if you want 3D performance.

Hope this helps...

Thanks for the info, that is the sort of number I was hoping for. Dick Hanson may disagree about the 22x8 thoughts, he has mentioned running that size on a ZDZ40 with success (albeit at lower rpm).

My target weight for the model is 13lb, which should give excellent performance. I mostly fly IMAC style, with big, smooth maneuvers instead of 3D tossing around, but it's always nice to have the unlimited vertical even if you don't use it that often.

Any info on how this engine responds to a canister exhaust or even a tuned pipe?


Mark

Yeah Dick will but the ZDZ engine produces more power at that lower rpm.. the Brillelli likes the higher rpms better.

I had a really nice Stihl on IGN. that turned at 20x8 at 7750.. it also turned at 22x8 at 6980 but it felt real suggish on the bigger prop.. the Brillelli will do the samething I think.

As far as pipes.. I havent a clue to be honest.

Mark,

I am running a Brillelli 40GT with a APC 20x8 prop and I am getting 7100RPM and 18lbs of thrust. This engine is on a CMP Giles-202 that weigh's 12lbs 10oz dry. The plane is a rocket and fly's pattern stunts very nicely. 3D is out of the question because the wing loading is to high. The wing area on my Giles is not enough to support 3D at this weight. I have less than 1 gallon of fuel run threw the engine so far and I am hoping to be getting around 7500 once the engine is broken in. I hope these #'s help you. The Brillelli 40GT is a awesome engine and I love mine. Here is a pic of the first test run.

Thanks for the replies and info, it has answered all my questions and helped with my decision making.


Mark