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Forum: Rotorheads

9th Feb 2008, 12:15

Replies: 1,327

Sikorsky S-76: Ask Nick Lappos

Views: 374,653

Posted By toolguy

Tq fluctuation

Four times is very strange especially if you have changed the box several times. If the only parameter that is changing, is Tq, with no yaw kicks (SAS/AFCS off) and no engine parameter change, look...

Forum: Rotorheads

29th Jan 2008, 10:23

Replies: 1,327

Sikorsky S-76: Ask Nick Lappos

Views: 374,653

Posted By toolguy

4p in S76

If you are seeing 4p 1.5 ips in straight and level on an intermittent basis, try measuring swashplate uniball for clamp up, may have wear on the outer races. Check Bifilar weights, pins and races...

Forum: Rotorheads

28th Jan 2008, 22:27

Replies: 1,327

Sikorsky S-76: Ask Nick Lappos

Views: 374,653

Posted By toolguy

4p in S76

First gather some data from either the Chadwick 8500 or RADS and try to quantify the 4p in terms of IPS. Then you will be in a better position to troubleshoot. Sometimes a 1p can appear to make the...

Forum: Rotorheads

9th Feb 2006, 16:09

Replies: 1,327

Sikorsky S-76: Ask Nick Lappos

Views: 374,653

Posted By toolguy

All of the above plus: Plus nose looks funny -...

All of the above plus:
Plus nose looks funny - kind of clipped
Center control rod column - lack of,
Cockpit door shape looks odd, making the pilot look smaller.......:}

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