acrofan

After losing Pacific Flyer and Sport Pilot I miss them sadly and badly, am more than happy to donate to this excellent forum to help keep it operating, it's too good to lose.

titanaircraft, usa, rotax 912 ul2 $14,337. Jabiru 2200 $15,335, looks like current price. What's that about?

Has any-one got a design for the 100mm angle-grinder, copying machine that YENN is talking about, ( I saw one many years ago) that could be used by a lowly amateur.Made a few props but having trouble getting both ends identical, After the prop is finished, balancing puts a different shape on one blade to make it lighter.

The blank looks great but 600grams heavy at one end, is too much to use weights in the hub area.

 

spacesailor

No. it's not a silly idea. I just don't know where you'd find a computer controlled machining facility. But really, once you've prepared the blank it isn't very difficult to finish it yourself. If you don't feel comfortable using spokeshaves & chisels, etc, you can do quite a lot of wood removal with a coarse rotary sanding disc, as others have suggested.Why not go & buy some cheapo pine planks from Bunnings Aviation Dept, lay up 3 laminates, & have a go at a prop? You can put a clock in it afterwards & sell it on Fleabay & the whole exercise won't cost you a cent! You might find it's easier than you think.

After reading somewhere that HKS engines are air and oil cooled, I wondered if jabiru could use oil cooled exhaust valve guides? Perhaps some chanels cut in recess before guides are pressed in and joined to oil going to rocker gear?I've no idea of how it could be done except in my imagination but if it made a small temperature drop to the exhaust valve, could it improve possible detonation issues?