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Making engine mount for phaser

12 posts in this topic

Posted

Ive changed directions and purchased a phaser snowmobile. Have been reasearching building the mount. They all seam to have the engine on an angle. The actual building of it I'm confident how do you determine where and at what angle to build into the mount?

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Posted (edited)

This is for a KF1 right?

I thought I heard that the early model Kitfoxes had a built in angle on the firewall?   You should be able to detect it (if it is there) by measuring back to the airframe.

Otherwise need to know which direction your prop turns.  Some people will angle about 2 to 4 degrees left for a left turning prop and opposite for a right.  That to counter P factor.

Some people say they mount zero angle and shim the mount later if they need to.

Edited by Yamma-Fox

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Posted

I measured the thrust angles of the 582 on my model II before I removed it. 0 degree left to right, 1 degree up from perpendicular to the firewall. Moving the thrust line up or down can also effect flight characteristics, I plan to keep the same thrust line as the 582.

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Posted

Shiming it sounds like a good way to go if your not happy with the angles its alot easier to change than building a new on does anybody have some photos of a completed one? And uea it will be going on a 1, brought it home yesterday.

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Posted (edited)

Here are pics of the one I made for my 4 cyl RX-1.  It is based off of several other examples of successful Yamaha mounts by other people.

The extra cross member on front left is for my oil tank and I needed to canteliver the right support that goes to the bottom mount location in order to clear the crankcase. 

Angles should be easier on your short 2 cyl Phazer and you wont have to stretch out so far so it should be a cinch.

20181001_115023.jpg

20181001_185428.jpg

20181001_185653.jpg

Edited by Yamma-Fox
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Posted

Good looking engine!! :)

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Posted

What are the specs on the tubing you used?

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Posted

Mostly all .049 x .75

Mount locations are .75 x .059 with brass bushings for the smaller dia bolts.  I did it that way to allow for some warpage and still get er to bolt up.

Big side tubes are 1.5"

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Posted

I have some 1 1/4 .049 I was thinking about using for the main tubes & 1/2 .049 for everything else. Not sure if that’s heavy enough wall for the side tubes.

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Posted

With the lightweight phazer and less cantilever distance id bet that would do fine.  But I might upsize it since i like to overbuild things ;)

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Posted

Looking at the pics looks like your using a mowhawk adapter, can you give us a report on it and where did the harnes come from?

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Posted (edited)

Not sure if you mean my pics?

If so then no I'd never use a Mohawk ANYTHING.  Mine is a Skytrax with C box.

I was friends with Greg at Mohawk early on but have unfortunately gravitated entirely away anything he does.

Biggest reason:  He builds prortotypes, posts videos of them and advertises them as the next greatest thing...  without testing / proving them / working out any issues with them.

Greg leaves the testing and R&D up to his customers.  That is fine if he were upfront about it because then you could decide if you wanted to be the test pilot of his engineering.  But he is most definitely not upfront about it!  Quite the contrary.

 

Edited by Yamma-Fox

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