Precedent Aeronca Champ 1/4 scale

The 120 glow 4-stroke will be too small. The 40cc gasoline (PETROL) engine will be too large. I think the 21 cc gasoline engine will be a prefect match. It will fly the plane in a very scale-like manner. You'll also probably need the nose weight the weedeater-type will provide.

This plane isn't very aerobatic or fast. Unless it seems REALLY weak, leave it as is.

I built one and fitted a Zenoah 45. It needed about 10oz of lead in the tail to balance it... It's still giving good service as a glider tug. I would say a Zenoah 26 would suit the plane perfectly. you should consider either the

120 4 stroke or the 21cc petrol.

As for the wing joiners... they're fine as the wing struts take most of the flight loads. I used 8mm aluminium alloy tubes for the struts, anchoring them with some hefty brackets into the wings. Similarly the fixing to the fuselage was stronger than the plan as well.

-- Philip Rawson

Mine was... ever seen a Champ prop-hang? or do a rolling circle... or an inverted low pass 3' off the runway? Granted mine had a couple of tweaks... changed the wing section and fitted a 45cc petrol...

-- Philip Rawson

"Jon-Magne Johansen" skrev i melding news:ct8jdq$8bh$ snipped-for-privacy@services.kq.no...

Hei Jon-Magne!

I have a Champ in similar state... I do have the the building manual though. I could scan it if you're interrested.

will be too large. I think the 21 cc gasoline engine will be a prefect match.

????

21cc is 1.28 ci. The 120 glow is 1.2 ci. Is the gasoline fueled 1.28 really that much more powerful than the 120 4-stroke?

Yes, that would have been nice. Thanks.

"TNA" skrev i melding news:ctah21$nbt$ snipped-for-privacy@services.kq.no...

Are these prototypical, scale-like maneuvers the full size Aeronca could perform?

The weedeater is not more powerful, but it will allow you to swing a larger, flatter pitch prop at a lower RPM. Perfect for this plane.

"Jon-Magne Johansen" schreef in bericht news:ct8jdq$8bh$ snipped-for-privacy@services.kq.no...

I fitted a 3W Twin methanol engine (2 x 24 cc) 5 hp. Very realistic sound in it and enough power for glidertug. For balancing I needed 150 gr. in the tailsection. She's an oldie (1985) but still love her.

Don't suppose so... then again, I've never had a go in a full size one.

-- Philip Rawson

I wonder what current full scale planes can prop hang? mk

Jimmy Franklin's Waco can, but I don't know if "prop hang" is technically correct. Works for me, though :)

"John Alt" wrote in message news:IdtKd.1026$ snipped-for-privacy@fe06.lga...

IIRC the late Turbo Raven could...right up until the gear box failed and it pancaked doing a vertical landing.

The Aeronca 7AC Champ had 65 hp, making it a slow (85 mph) and low (poor climb) airplane. No aerobatics other than spins; there wasn't enough power to get serious. Even with 85 hp it wasn't aerobatic. The most powerful brothers to this airplane have 180 hp and would never prop-hang.

Dan (lots of real Champ time)

Takes an even better weight-to HP ratio than that. An aircraft engine might be expected to produce three or four pounds of thrust per hp at full throttle. Even the newest really powerful aerobatic airplanes with 400 hp or so and grossing around 1800 lb (at a guess) can't hover or maintain vertical climb. The best I've seen was the YAK

55 with the geared 360 hp radial, and it could do some awesome stuff. The gearing of the prop does it: a large-diameter, slow-turning prop gets more thrust per hp, while allowing the engine to rev higher and generate more horses, since hp is a function of torque x RPM. And a geared engine produces more hp per pound of engine weight, so the airplane can be lighter.

Dan

Jurgis Kairys

Dear Sir

Is there any possibility that you still have the build manual for this kit,

as I have bought a 1/4 scale kit on e-bay and although it would appear to be complete, I see that there is no building manual and no engine cowling.

If a build manual was available, I would be pleased to repay any expense that you may have in copying it.

Regards and thanks.

John Sangster Bix House

27 W> Yes, that would have been nice. Thanks.