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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityElyQ › bell-cranks + fai style swash
04-30-2010 11:40 PM  8 years agoPost 1
az_heliguy

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San Tan Valley, AZ

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there has been issues with the bellcrank setup coupled with the fai style swash from ely-q about how with the standard setup, the cyclics have slowed down a considerable amount. also how when at full positive pitch, that the swash becomes bound up against the main shaft collar reducing the amount of cyclic deflection you can get.

although i dont have the bell-crank parts here (they will be here tomorrow along with new 10mm shaft collars), there is an easy way to put it back to a 1:1 ratio.

as it stands, with the stock servo-swash setup, everything relates to a 1:1 ratio, but when you add the fai style swash with the direct servo setup, that changes to a 1.6:1 ratio, slowing down the cyclic speed. the same is for the bell-cranks. with them and the stock swash, its a 1:1 ratio. add the fai style swash and goes back to a 1.6:1 ratio.

if you look closely at the bell-cranks, they too are programmable. instructions say to use the outside hole on them. so if the fai style swash is a 1.6:1 ratio, you should be able to correct this with the bellcrank setup by moving the metal balls closer to the inside (3rd hole, closest to the center), which should in turn make the ratio equate to 1:1.6:1.6:1 = 1:1.

now again, this is my theory, but will be tested this weekend once the bell-crank parts arrive and i am ablke to convert the setup over. now im also going to be using the century metal swash, which is the same ratio as the elyq fai style swash, so there will be no difference. there is also another rr member lso testing this out as well that is using the elyq fai swash and should also have results in shortly.

as for the issue the new swash hitting the main shaft collar, this can easily be fixed by removing the main shaft, flipping the upper bearing block, and using 2 main shaft collars, both between the upper and middle bearing blocks. ill also have the new shaft collars arriving in the morning too, so will address that in the findings, but one goes against the top side of the middle block and the other on the botom side of the top block.

when doing this, you will also have to drill 2 x 1/8" sized holes in the frame to easily access the set screws on the collars, but ive ordered 2 clamping style, low profile collars from century. who knows, maybe just one of them on top like normal will be enough clearance, but will see tomorow

so, until then, happy fying

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05-02-2010 07:50 AM  8 years agoPost 2
az_heliguy

rrKey Veteran

San Tan Valley, AZ

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update:

bell-cranks installed and everything setup. using the fai style swash (century version, but same ratio). +/- 12 on collective @ -50 on swash mix, +/- 8 on aileron/elevator @ 70% swash mix. all atv's are 100%

im using the outer suggested holes on the bellcranks as well for now, but will be testing the other positions tomorrow morning while at the field, but on the benchit really sped the cyclics up and i did have to lower the swash mix for aile/elev/pitch to keep the same amount of throw.

will report back again with actual flying tomorrow afternoon

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05-02-2010 05:40 PM  8 years agoPost 3
az_heliguy

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San Tan Valley, AZ

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testing will have to wait till later today or another day, way too windy out to fly today. woke up this morning and the wind was howling outside

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05-06-2010 03:24 PM  8 years agoPost 4
Alexm0324

rrApprentice

Atlanta, Georgia USA

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Matt,
Did you end up mounting the mainshaft collars inside and flipping the bearing blocks to get to the 8 degrees of cyclic, or did you get 8 degrees before flipping the blocks and mounting the collars inside?

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05-06-2010 07:54 PM  8 years agoPost 5
az_heliguy

rrKey Veteran

San Tan Valley, AZ

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i didnt flip the bearing blocks, i replaced the stock elyq one with the century locking collar. i also changed the length of the control rods as well, just made them a couple mm longer.

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