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Advice for buildin aluminium hull.
- Thread starter M0RYAK
- Start date
Slidin Gator
Well-known member
M0RYAK said:
Glad you figured out the hull tuning, she seems to ride well now. :thumbleft:
M0RYAK
Well-known member
Last year I received an American prop (two blades Wisper tip 72”), and putted it on my current engine for testing. I made a new prop spacer for it.
I was playing with a pitch about an hour and finally set it up to 10 degree on B, that gave me max speed 35 mph (2200 prop rpm against 9000 engine rpm at WOT) and 25 mph at cruise (1300 prop rpm against 5000 engine rpm). It was perfect result. Less nose, less rpm for cruise against previous prop.
I did not find any dings or damage on prop spacer and rotax coupling, which I used for connection the gear box and trust bearing shaft. But any way I wanted to revert old prop back for avoid potential problem during long voyage. Unfortunately, I hadn’t time for it. Next day I rode for hunting by my brother's request to help him, and after 2 hours my engine suddenly went out, something blocked gearbox. The coupling and damper element had damages. It was the fail.
Before installing WT, I should have improved the shock absorber, because it was too poor for WT. The WT have weight 3 time more than previous prop.
I spent one week and 600$ for changing engine on the same one. I hadn't time for repair, but probably broken 1st gear was reason of blocked (4-month ego it was confirmed). After replacing the motor, I had rode some times to hunting and then sell it for getting money to new power unit.
I was playing with a pitch about an hour and finally set it up to 10 degree on B, that gave me max speed 35 mph (2200 prop rpm against 9000 engine rpm at WOT) and 25 mph at cruise (1300 prop rpm against 5000 engine rpm). It was perfect result. Less nose, less rpm for cruise against previous prop.
I did not find any dings or damage on prop spacer and rotax coupling, which I used for connection the gear box and trust bearing shaft. But any way I wanted to revert old prop back for avoid potential problem during long voyage. Unfortunately, I hadn’t time for it. Next day I rode for hunting by my brother's request to help him, and after 2 hours my engine suddenly went out, something blocked gearbox. The coupling and damper element had damages. It was the fail.
Before installing WT, I should have improved the shock absorber, because it was too poor for WT. The WT have weight 3 time more than previous prop.
I spent one week and 600$ for changing engine on the same one. I hadn't time for repair, but probably broken 1st gear was reason of blocked (4-month ego it was confirmed). After replacing the motor, I had rode some times to hunting and then sell it for getting money to new power unit.
![IMG_3466[1].jpg](/community/data/attachments/17/17421-1a2dde8e592764a9af7265ed2d8d43a3.jpg)