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Rotax914+Woodcom high twist+

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ploucandco

Joined: 16 Sep 2007
Posts: 69

Posted: Sun Oct 23, 2011 12:35 pm Post subject: Rotax914+Woodcom high twist+

Hello all,



Today afternoon, I tried on My Europa monowheel the new combination of a 

- ROTAX914

- Woodcomp high twist SR3000/W (like the one of David Joyce)

- SmartAvionics constant speed controller



Impressive look.... But I only got 5200-5300RPM instead of the expected 5700 in take off mode! I recalibrated the throttle with the ROTAX program, but still had the same result.



Any thoughts?



Thanks, Jacques

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carl(at)flyers.freeserve.
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Posted: Sun Oct 23, 2011 2:38 pm Post subject: Rotax914+Woodcom high twist+

Hi,



Sounds like you need to decrease the fine pitch by about 0.5 degrees to

achieve the 5,700 RPM. 



We had the same problem setting up our Woodcomp propeller.



There are two microswitch cams that need adjusting - the main one and the

safety backup one (this is normally set up about 1 degree finer than the

main one).



As Ivor says you need an allen/ hex key to loosen the grub screws that lock

the cams in place.(one end of the allen key may need to be ground down to

fit into the restricted space between the blades and the backplate).  The

allen/ hex key needs to be a good fit as the retaining grub screws are

loc-tited into place and can take a lot of force to shift. 



If you tape a digital level to one of the blades its easy to make the

necessary adjustment with a fair degree of precision .



If you make a ground run once the micro switch stops have been adjusted you

should see about 5,400 RPM static on the ground - this should increase to

the magic 5,700 on take off. I guess with a 914 you will need to tie the

tailplane to a tree (or the towbar on your car)



Good luck.



Carl

C-LABS



--

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