Recent content by BBerson

Was there a big static rpm change after the valve seat work? I would adjust the mixture with new plugs and check the color after 5 minute runs.

The 2800 sounds about normal to me for static. What is the book number for static rpm? Dana said the 3200 is at 60 mph. The throttle position is not abnormal either for static, I think.

I don't see any circuit breakers that reset after cooling down and toggling the master switch. But I do see some "not FAA approved" electronic circuit breakers in the Aircraft Spruce (2016) catalog. They shut down with over or under voltage and reset by toggling the master. Might be what...

That is a bit too simple. In his test he has the fan blowing the flat backside of the prop. In flight the wind hits the curved frontside. I did it with my fan and my prop, big difference. It barely rotates in the correct orientation and doesn't hurt when sticking my finger in it.

I think he said " west coast". Could be Oregon or Washington.

For an airplane prop shaft the losses could be as small as the bearings, I think. Three bearings shown here, but only one additional bearing is needed for direct drive.

Certified airplanes sometimes have rpm avoid zones. Marc's prop came off with some airframe damage but the landing was a success.

Yep. My spar failed first test also. That compression cap is a bugger.

The Questair skins were stretch formed with hydraulic cylinders, as I recall, from the Sport Aviation article.

One guy on the yahoo small engine forum flew his vertical shaft Briggs with the 90° belt drive on his powered parachute. I would think three feet of straight belt should twist ok. I wouldn't call it a twin engine airplane because if one engine seized it would stop the other engine same as any...

Cirrus floundered at the beginning with a pusher. Pusher has never seen a mass certified market, as far as I know. Cirrus abandoned the pusher.

Long V belts can be a shaft alternative. The engine would be vertical shaft like a Briggs 810 or two- stroke mounted vertical. The belt is turned 90° around rollers to the horizontal prop shaft pulley sheave. Two Briggs 810 could power one prop for about 60hp.

Do you remember the prop rpm direct drive in static, climb or cruise? I see it is rated at 6300 rpm, but doubt that is used direct drive.

"At this point a simple mechanic is smarter at implementing something than a claimed engineer." He doesn't claim to be an engineer or mechanic.

Water pressure is relatively safe.