by peter » Thu Jan 14, 2010 2:31 am
Hi Shannon...You guessed right..the motor I'm working with is a 6.5 hp honda clone...If you go to NR Racing it's the yellow clone package 1, with a honda jet and the fuel pump package only....the prop I'm testing it with is a 31x12...the same size that I'm using on my ser 3....the 185's turn them 5200-5400 tops...I first started testing with a new 6.5 clone...139 bucks from Princess Auto, and by just taking out the gov. only, I was getting 4550 rpm or so....that's about my cruise power showing 42-43 on the Halls...and then by putting on a strait pipe the revs increased to 4800....Just today I got the new racing motor going and after a half hour or so of running, a couple of short shots of full throttle brought the tack up to 5050...didn't hold it full power, but it looks like it is capable of maintaining at least 5000.rpm. I have a couple of 34x12 props ordered from GSC..150ea. Can....the static thrust calculator (interesting...google it) shows I should get about 4300 rpm at 8.5 hp giving me 71 lb thrust and an est. flying speed of 48 mph.....This is all quite encouraging, because according to my figures I'll be able to fly quite well, providing the main bearings can stand the load...I'm pretty sure the stock rod and flywheel are up to the job....so far I have put 14 hrs. on the other motor, all at full throttle, and nothing has broke yet....I weighed the little yellow clone...28 lbs. and the prop and hub at 2...by the way, the engine will run 1 hr and 25 min. on a full tank ( 3.6 liters ) at full throttle....if these mikuni pumps can lift the fuel out of the main tank, a guy could get quite a piece from home on a full tank ha ha....some P.P. guys in England are experamenting and flying with these beefed up clones...google Eggmotor for some interesting entertainment....I'll keep you posted.....Best wishes to all in the New Year....Pete