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Forum: Rotorheads

8th May 2006, 13:22

Replies: 95

why does the nose pitch forward when you lower collective?

Views: 17,840

Posted By Thomas coupling

Droopy: When you lower the collective: ...

Droopy: When you lower the collective:

FIRST, the Aof A reduces, and THEN the a/c descends. Not the other way round.
If the Aof A didnt reduce, the a/c wouldnt lose lift and descend?

I'm...

Forum: Rotorheads

6th May 2006, 12:01

Replies: 95

why does the nose pitch forward when you lower collective?

Views: 17,840

Posted By Thomas coupling

Droopystop: do the maths. Start with the formula...

Droopystop: do the maths. Start with the formula in equilibrium (on both sides obviously) and then enter a reduced AofA into the formula on both sides. Everything else in the formula is same.
The...

Forum: Rotorheads

4th May 2006, 20:57

Replies: 95

why does the nose pitch forward when you lower collective?

Views: 17,840

Posted By Thomas coupling

CL12..: L = (1/2) d v2 s CL d, s, are...

CL12..:

L = (1/2) d v2 s CL

d, s, are the same on both sides of the disc (adv and retreat).

The formula is balanced due to flapping to equality in fwd flight (or in the hover with a wind).
...

Forum: Rotorheads

3rd May 2006, 10:23

Replies: 95

why does the nose pitch forward when you lower collective?

Views: 17,840

Posted By Thomas coupling

Because of the coupling between the controls and...

Because of the coupling between the controls and tail stabilator.

Forum: Rotorheads

3rd May 2006, 06:44

Replies: 95

why does the nose pitch forward when you lower collective?

Views: 17,840

Posted By Thomas coupling

Dis Mystery has it right. The instantaneous...

Dis Mystery has it right.

The instantaneous reaction to lowering collective is for the lift on the advancing side to reduce MORE than the lift on the advancing blade. [The amount of blade angle...

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