the pope

The recommended running in for gassers is to put it in a plane and fly . If nothing else in the plane with the wings attached . This lets the plane absorb some of the vibration . Hard fixed to a plank of wood is not good .The beam mount 15 is the better of the rcgf 15's . You maybe trying to polish a turd ! Cheers the pope

I-fly-any-and-all

My Feedback: (1)

an os 91 is the equivalency of a 15cc gasser, just as a 20cc gasser is equal to 1.20 nitro engine. a 60 or 61 os 10cc's, look at the webra 61 (10ccm) there you have it.


taken from os 91 four stroke info
http://www3.towerhobbies.com/cgi-bin...?&I=LXSY82&P=7

[TABLE="width: 100%"]
[TR]
[TD="bgcolor: #f0f0f0"]SPECIFICATIONS[/TD]
[/TR]
[/TABLE]
Bore: 27.7mm (1.09")
Stroke: 24.8mm (.976")
Displacement: 14.95cc (0.912 cubic inch)
Power Output: 1.6 BHP at 11,000 RPM
Practical RPM Range: 2,000 - 12,000 RPM

paulinfrance

Thanks for all your advice on the Forum, I have run the engine with the timing between 26° and 30° this morning and it does lose between 200 and 500 rpm, it loses the 500 rpm with the 13 X 6 apc prop and doesn't seem very happy, the best compromise is the 14 X 8 APC at 28°, it does lose 250 rpm but doesn't vibrate too much, so I will go ahead with building my Yuki 1700 cm Zero, and in between run the engine in on 4% oil.

paulinfrance

I seemed to have it sorted out, the bolt on the end of the crankshaft that takes the prop was 0.40mm out of line (bent), after straightening it out and running it a 1/8 of a turn richer I am getting virtually no vibrations.

Lifer

My Feedback: (1)

Glad you got it worked out.

What plane is it going into?

paulinfrance

A Mitsubishi Zero from Yuki models, 1.700 cm span, it looks like the Seagull one but in Grey,,,

http://www.ebay.de/itm/Mitsubishi-A6...-/201415109749

I can't seem to upload the picture !.

Lifer

My Feedback: (1)

Too bad we can't fly the P-40 and your Zero in formation. In any case, best regards!

paulinfrance

A friend of mine has a P 40 but we will be flying together with his Kawasaki Hein,,

paulinfrance

A few surprises on the Zero build, it is (only just ) held together with 'super crap' , straight onto the charred brown laser cut, consequently, every time you pick it up something cracks or breaks !,

paulinfrance

Nearly finished, I had read somewhere that the 95mm C of G was wrong, but I can't find the forum build,
I will give it a 'weigh in' tomorrow and try and work out the wing loading, only the radio switch to put in and clean up the wiring,,

hairy46

My Feedback: (1)

Just ordered a RCGF15BM looking forward to mounting it on a sixty size stick

ahicks

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Saw that combo fly yesterday. Pretty sure you're going to enjoy it!

rhd-RCU

My Feedback: (36)

Where did you get yours. Every place I looked is out of them.

hairy46

My Feedback: (1)

Yes excited about it. Still fairly new to gas,but have jumped in with both feet.

hairy46

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Valley view hobby is showing one left

paulinfrance

It will be more fun with the version BM, as it is more powerful, I have run about 3 litres of fuel through mine and I get 8.400+ rpm from the APC 14 X 8 prop, and its really fun and stable to fly, have fun !

rhd-RCU

My Feedback: (36)

Thanks

the pope

You can get them here in Aus if you wish . Cheers

paulinfrance

I friend of mine has the P 40 with a RCGB 20cc in his, running an APC 16 X 10 at 7.400 rpm and it leaves my Zero standing,,,
But the 15cc is a nice motor, it has 10 litres of fuel through it now and NO dead sticks,,,

antic

? What about gasoline engines that run with glow plugs ? Do they run as well as ignition/spark plug engines? Simpler, and lighter. Thanx; JH

fby002

Other than beam vs radial mount is there any difference between the RCGF 15 and the RCG 15.

ahicks

My Feedback: (2)

Yes! The radial mounted engine is down on power compare to the beam mount. The newer design of the beam mount includes an extra transfer port.

paulinfrance

Well after 2 years of fun flying my Zero is no more,,, hunting down my friends Russian plane for ages, and
I run out of petrol, and it stopped 1 metre short of the runway, it had started to fall to pieces anyway, two of the crankcase
engine mountings were broken and then only people selling them wanted "Gold" for them, I put on a couple of forums
asking weather the beam mount crankcase fitted it but looking at this thread, it won't,,
so I "sandwiched" between the two halves a 4mm sheet of Dural, and aligned the cylinder ports with the crankcase,
it's going in a Seagull P47 that arrived this morning.

Lifer

My Feedback: (1)

Sounds interesting! Could you post a picture of your modified engine?

paulinfrance

I turned down 4mm on the crankcase half and sandwiched a 4mm Dural plate between them, Is this clear enough for you ?
Paul