So I've been building an ultralight

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danny_galaga:

--- Quote from: Zebidee on September 06, 2023, 01:21:34 am ---Love how dodgy it seems at first glance: used motors with missing parts, bit n pieces from Aliexpress and go-karts. Yet I am optimistically confident you are doing it right (interpret as: I have no idea :dunno ).

Work a little WD40 or similar into that throttle cable sheath and check it occasionally for corrosion - I got my 1975 Holden HZ ute airborne thanks to a stuck throttle, somehow survived, hate to think what it'd be like for someone airborne already.

--- End quote ---

😄

First car I ever drove was a HQ. Tanks 😊

Interestingly, the Rotax carbies are full throttle as a default.springs hold them wide open. The idea being if a cable breaks you can still where you are going. If it broke and went to idle, you're gonna have to land. Only thing is that the engine is only rated to full power for a number of minutes. I think if it happened to me, I would switch off one of the ignition switches. You lose maybe 150 rpm. Would still be NEARLY full power but not totally wringing it's neck. Then alternate the switches every 5 minutes or so the plugs don't foul.

This weekend, I think I have everything I need to put in some oil and coolant and start him up. Of course nothing is ever easy. Imma guess you know how to change the oil on a car. Well forget all that on the Rotax! It's a dry sump engine. Basically to fill it up, you take off the return line on the oil tank. Point that into a container. Plug up the hole in the tank. Pressurise the tank to 10psi via the vent line. Take out the top spark plugs. Now spin the propeller around by hand maybe 100 turns 😜

Even most other aircraft enginesis roughly the same procedure as a car. Grrrr. Lucky there's a compressor in the hangar...

nitrogen_widget:
so what is the difference between a rotax and a rotary engine or are they basically the same thing?

danny_galaga:
Rotax is a brand, not a type. They make engines for motorcycles, jet skis, go karts aircraft.

A rotary engine is similar to a radial. So the cylinders are in a star formation. But CRANKSHAFT is bolted to the firewall and the propeller is bolted to the crankcase. The whole engine spins. Good cooling, HUGE torque (a 110hp rotary had more torque than a GT40!). but you can imagine a large unwanted gyroscopic effect. They were pretty much history after WWI.

The Rotax engine I'm running is a 4 cylinder 'boxer', like Subaru or Porsche etc.

danny_galaga:
Milestone for the millstone

https://youtu.be/cPObCLKcieQ?si=Wp_gPVCQ2n4YtV4l

nitrogen_widget:
is that how it's supposed to sound?
or does it need tuning?

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