ls wrote:
tffy wrote:

This is for a hypothetical ultralight design, so just looking for
suggestions here of where to look at... hopefully a 4-stroke, purchase
price doesn't matter much, certification status doesn't matter either.
Long time before overhaul matters A LOT... so, the longer the better.
Is there anything out there in the 80-hp range? How about a motorcycle
engine conversion - how long can those go before needing to be
overhauled?

Thanks!

- Jabiru 2200. A local has one of these on his Kolb and he's getting
really good results with it. Very reliable running motor.
- HKS 4-stroke. I have no experience with these.
- Rotax 912. Expeeeeeensiiiiive.... cost as much as my entire plane! But
a very good reliable motor.


LS
N646F

If you're willing to do some developement work, a single rotary engine
would fit the bill. Peripheal ported, you could make up to 120Hp (if
your willing to turn it that fast). There's some development of
aluminum side housings going on, which will hopefully get the installed
weight into the 150lb range (I think that is the right number.) Oil it
right, and don't let it get to hot and it should last your forever.

--
This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."