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by Upsidedown
Fri Dec 08, 2017 11:08 pm
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 11
Views: 823

Re: Whirlwind propeller shake

So the cause of all this may be that the face of the crankshaft was not machined straight. Unfortunately I won’t know if this was the issue until the spring but I will be sure to report back. I’ll tell the story so it may help someone I purchased this engine with a very minor prop strike. It dialed ...
by Upsidedown
Fri Dec 01, 2017 5:03 pm
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 11
Views: 823

Re: Whirlwind propeller shake

Shipchief-exactly what I was thinking except below 2450 there was no smooth spots at all. It was better when I rotated the prop but still unacceptable with any power or airspeed combo below 2450/2430ish. I was going to try all the other positions on the crank, with Whirlwinds blessing, (Jeremy at Wh...
by Upsidedown
Mon Nov 13, 2017 6:26 pm
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 11
Views: 823

Re: Whirlwind propeller shake

Here is the latest. Tried different length bushings in rubber mounts, no change. Backed off the timing to 22 degrees, no change. Cleaned and tested the plugs, they looked good but did it anyway, no change. Mag drop during run up has always been 30-40 rpm and no real difference in vibration during a ...
by Upsidedown
Thu Oct 05, 2017 12:36 am
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 11
Views: 823

Re: Whirlwind propeller shake

I'm using the aerobatic dynafocal mounts that Aircraft Spruce sells, part #08-03600. I'm suspicious of the mounts as well. I may try another set that I have just to see if it changes anything.
by Upsidedown
Tue Sep 26, 2017 1:43 pm
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 11
Views: 823

Whirlwind propeller shake

Hello everyone I have a dozen flights on my version of the Laser type and things are progressing well. Running a Whirlwind 200AC in front of a straight valve ECI Titan IO360 with a Superior cold air intake. I had the prop dynamically balanced but I'm still getting a shake in the airframe. My guess i...