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by Upsidedown
08 Jul 2018 01:07
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 15
Views: 7706

Re: Whirlwind propeller shake

Dave I followed your troubles on other forums and tried just about everything as you did. Found the problem and got it fixed. Now fine tuning. I will also do the light weight flywheel soon with rebalancing. So far so good though. Amazing what a proper crank flange will do. I’m at 1030lbs empty but i...
by Upsidedown
10 Jun 2018 14:15
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 15
Views: 7706

Re: Whirlwind propeller shake

All I have a couple flights on the new engine and all the vibration is gone now. I can’t praise Whirlwinds service enough. They were willing to go above and beyond to fix this. I called ECI to give them the serial # on the crank that may have slipped by. As I was not the original owner I’m not sure ...
by Upsidedown
08 Dec 2017 23:08
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 15
Views: 7706

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
01 Dec 2017 17:03
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 15
Views: 7706

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
13 Nov 2017 18:26
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 15
Views: 7706

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
05 Oct 2017 00:36
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 15
Views: 7706

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
26 Sep 2017 13:43
Forum: Laser
Topic: Whirlwind propeller shake
Replies: 15
Views: 7706

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...