N601LL is 100 hours now and only remaining item was needing some up elevator trim for level flight and not enough up trim for a proper flaps down engine out glide.  The incidence of both wing and stab were good but as it does take quite some force to lift the elevator I decided to try a simple fix.  I put an eye hook on stab, drilled a hole in elevator horn and installed s-hook there.  Then connecting the two using #64 rubber bands discovered that seven was a good balance. 

I have not test flown due to weather here but hope to tomorrow and will update the post.  Note elevator approximately centered and the trim is what was needed for level flight.

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Comment by James Machin 2 hours ago

Hi Joe,

Borrowed your rubber band idea for my 601XL and installed this weekend.  Worked like a charm but I am probably where you were after your first test flight - huge improvement but not quite hands off with full flaps.  I originally did the spring on the stick thing but wasn't happy with all the load it put on that front thrust bearing on the stick assembly - 40 lbs for the up cable, 40 lbs for the down cable and another about 40 lbs for the spring.  I could feel the friction in the ailerons go up so I removed it.  Back on the elevator bellcrank doesn't really add any extra load in the cable system.  I also like how easy it is to fine tune the force.  

Great idea, Thanks!

Jim

Comment by Joe Hopwood on June 22, 2020 at 7:03am

Test flight showed considerable improvement but trim still not zero.  I added two more rubber bands and bingo.  Cruise level with zero trim and full flaps, full up trim and throttle ides it files a hands off approach.

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