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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawk - Pitch range pushrod adjustment
12-18-2003 06:49 AM  13 years agoPost 1
Ninjak2k

rrApprentice

Centreville, VA

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Let's say you've setup the Hawk and are setting your pitch curves and find the following:
Pitch envelope of 20 degrees
Max top pitch 8 degrees
Max negative pitch of -12 degrees

Assuming a linear curve for the moment, you should get -2 degrees at mid-stick, right? If instead, you find you are at say -4, so more movement for the upper half of the stick than the bottom, what needs to be adjusted?

Assuming you do get -2 degrees and you wanted a linear setup of -10 to 10 degrees, what would need to be adjusted? It seems that either the long pushrods from the swash to the bell mixer or the short arms from the bell mixer need to change. Which should be adjusted? Advantages of one over the other?

Thanks in advance!

~Dan

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12-18-2003 07:42 AM  13 years agoPost 2
fritz

rrApprentice

San Antonio, Texas 78232

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C pushrods

from the swashplate to the bell hiller mixers/ blade holders, and then touch it up with end point adjustmens on the servo

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12-18-2003 01:23 PM  13 years agoPost 3
sreuss

rrApprentice

Ontario, Canada

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Hi Dan,

Fritz is going in the right direction w. his recommendation. Here are some additional thoughts...

As most others, I set my collective and cyclic linkages so that they give me 0 collective/neutral cyclic for mid stick/50% output, while being as close to 'rectangular' (i.e. parallel and perpendicular as required) as possible.

I've been able to reproduce this setup by dividing the linkage assy's into two groups; those above and those below the swashplate. For a moving swashplate setup, I try to center the swashplate in its potential range of travel, or slightly below it, so that I can get a bit more +'ve than negative pitch. Then I adjust the linkages working from the swashplate to the head, and from the swashplate to the servos to give the proper geometry.

Before I worked out this systematic way of setting things out, I found that I had to iterate a lot through the linkages to get the right geometry AND travel AND centering. You may still have to take a couple of passes through the linkages, but you should end up pretty close from the start.

Hope it helps!

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Hawk - Pitch range pushrod adjustment
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