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mod IV almost ready

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Posted

Have been working on this for a while, its mod IV 1050 with 670.

When Akflyer comes home from the slope we will finish final fitin and w/b etc

IMG_0257.JPG

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Posted

Looking good! Mike

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Posted

I had a 96 Ski Doo summit with a 670.  That thing pulled like a freight train.

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Posted

Waht do those 670's use for an exhaust system?  Does it still fit under the cowling?

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Posted (edited)

The exhaust came from  Rotax Rick and wasn't even close to fitting.

I had to turn the down pipe 90 deg, while keeping every thing the same length and diameter

and slightly change the down angle,

I understand he now has an exhaust that is supposed to fit????

In the picture the exhaust is in the cowl

Edited by akflyerbob

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Posted

Time to update this one!  Last weekend I put the maiden on this bird.  The 670 pulls HARD!   Had a few bugs to work out so I did not get to really put her through the paces much other than playing with prop pitch and 4 or 5 turns around the pattern.  I went with conventional wisdom and set the prop for 6100 on the ground thinking it would unload in the air as it does with the 582.. I was wrong.  It actually loads up more as soon as you start rolling.  Take off and climb out is about 400 RPM less than the static.  I can only figure that the blades are stalling on the ground run and actually loading up once moving. 

Have a few quirks to work out but man what a sweet flying bird this is!  I can't wait to get home and continue the flight testing and really get to start pushing it a bit and see what she will really do.

Congrats Bob on building yet another sweet flying bird!

:BC:

 

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Posted

Keep us posted ! I want to hear more about that 670. 

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Posted

I agree!  So little results posted!  Cheers Randy 

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Posted

Should have more to post about in a couple weeks.  I will say it pulls really hard and without pushing it I was off the ground in under 100' and climbing hard.  Going to bring the GPS with me on future flights to record data etc and see what I am really getting with it.  The big issue will be long term and how well it holds up.

:BC:

 

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