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Hirth Engine


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The f-36 is the new name for the solo210.


Hirth is now the manufacturer. At least in North America.

Didn't the FB monster switch to the F-33?


Or was it an MZ34?


The old monster used to have a tuned pipe f-36 no?


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I have a F33 AS engine(30HP with hirth's exhaust), I used it as an engine of my paramotor, no reduction, directly drive proper (diameter 80CM),F33 AS weigts 12.7kg, exhaust weights 2.1kg , reduction weigts 2.3kg. RMP over 8000, and thrust is 60kg nearly.For me(73kg),the thrust is enough.

advantages of directly drive proper without reduction:

1: light weigt, my paramotor weight 24kg(no fuel)

2: RMP of proper responses variety of throttle quickly

3: short framework, portable and transport

shortcoming of directly drive proper without reduction:

1: efficiency of engine isn't the best

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Please don't bring that thing anywhere near my house as those figures show your prop tips are on the cusp of Mach 1 at sea level. The noise must be apalling. A normal paramotor with redrive has a prop tip speed around Mach 0.5

I owned a direct drive 2 stroke in the past that had a prop diameter that gave a tip speed of around Mach 0.8 and that was bad enough.

You can have all the horse power in the world yet it is useless if you can't turn it into thrust.

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Norman your prop is actually doing about M0.4 (roughly worked out in my head). 5800rpm is the engine revs. Divide that by the reduction ratio (about 2.5 for yours at a guess) to get the prop rpm. Most paramotor props are geared or redrived to turn at somewhere around just over 2500rpm.

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Si, i have looked online and my mz34 seems to be the same as the hirth f33, as you know, i have only had onw flight and the exhaust fell apart mid flight and it didnt seem as good as my fly200 (simmo). but my new exhaust has arrived so i will hopefully fly it soon - ill let you know how i get on!

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It's not just about the motor, there are so many other variables that you can't really quantify weights to engine size in such a simplified form. There are some big motors out there connected to rubbish drive systems that struggle to get light pilots off the ground and can exhibit unsafe levels of torque and propensity to riser twist while other big guys can fly well on surprisingly small motors if proper attention is paid to matching the kit and setting it up right.

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2 strokes work best in their powerband. You have now started operating you machine out of that area and are in the very vague mid-range. you can't use the top end because of supersonic efficiency losses so i have to wonder what you have gained! It must be like permanently trying to drive a Ferrari around in 1st gear.

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