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Search: Posts Made By: Birdy2
Showing results 1 to 16 of 16
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Forum: Rotorheads
27th Dec 2016, 10:12
Replies: 48
Views: 11,376
Posted By Birdy2

and the only thing I saw that jumped out at me is...

and the only thing I saw that jumped out at me is that he mentions that you are in Ring Vortex State when doing a zero speed autorotation
You are safe from VRS in a virtical decent while in...
Forum: Rotorheads
23rd Dec 2016, 10:21
Replies: 23
Views: 5,670
Posted By Birdy2

Teetering and undersling are unrelated. ...

Teetering and undersling are unrelated.
Teetering allows each blade to compensate equally for the difference in airspeed while traveling horisontaly.
No horisontal travel, no movement on the teeter...
Forum: Rotorheads
23rd Dec 2016, 06:30
Replies: 23
Views: 5,670
Posted By Birdy2

I hope you find the formula Gray. It must be...

I hope you find the formula Gray.

It must be calculated for average AUW, to keep the teeter hinge on the COM with the average cone angle.

And iv always been interested on coaxial, love to hear...
Forum: Rotorheads
22nd Dec 2016, 09:13
Replies: 23
Views: 5,670
Posted By Birdy2

The amount of undersling is easily calculated,...

The amount of undersling is easily calculated, but not by me.
Forum: Rotorheads
20th Nov 2016, 23:40
Replies: 230
Views: 73,205
Posted By Birdy2

Crab, you said, In forward flight there is a...

Crab, you said,
In forward flight there is a difference in V squared between the advancing and retreating side so the increase/decrease in pitch has a bigger effect on the advancing side
Not being...
Forum: Rotorheads
19th Nov 2016, 02:52
Replies: 230
Views: 73,205
Posted By Birdy2

But when you dump collective, you have very...

But when you dump collective, you have very little MR thrust, so itll have negligable effect on the airframe, till autorotation restores thrust.
Meanwhile, youv dropped and the HS has lifted to...
Forum: Rotorheads
18th Nov 2016, 07:59
Replies: 230
Views: 73,205
Posted By Birdy2

Dump collective, machine drops, airflow from...

Dump collective, machine drops, airflow from underside, horisontal stabiliser raises boom, ( nose drops)
Forum: Rotorheads
16th Nov 2016, 08:36
Replies: 230
Views: 73,205
Posted By Birdy2

I hear what your saying TTSN, yes, some of these...

I hear what your saying TTSN, yes, some of these incidents could slip past the keeper as another low G boo boo, and some low G incidents could look like angry rotors.
Authorities seem fixated on...
Forum: Rotorheads
16th Nov 2016, 01:44
Replies: 230
Views: 73,205
Posted By Birdy2

A couple of points about the condition of the...

A couple of points about the condition of the head hinges, if a flap hinge had more friction than the other, to the point where the many tones of centriphical tension couldnt break the binde, itd...
Forum: Rotorheads
15th Nov 2016, 09:22
Replies: 230
Views: 73,205
Posted By Birdy2

Thanks Birdy, but I must be missing something. If...

Thanks Birdy, but I must be missing something. If the blades are free to flap, why then the teetering head?
The blades teeter on the central hub hinge, and can cone freely on the indervidual blade...
Forum: Rotorheads
14th Nov 2016, 00:46
Replies: 230
Views: 73,205
Posted By Birdy2

Megan, the light metel robbi blades dont like to...

Megan, the light metel robbi blades dont like to be flexed.
The added flap hinges are intended to relieve the bending stresses at the blade root when changes in G load produce changes in the coneing...
Forum: Rotorheads
14th Nov 2016, 00:42
Replies: 230
Views: 73,205
Posted By Birdy2

TTSN, On November 3, 1987, at approximately...

TTSN,

On November 3, 1987, at approximately 1338 Pacific standard time, N8475A, a Robinson R22 Alpha operated by Helicopter Adventures, Inc., broke up in flight during a dual instructional flight...
Forum: Rotorheads
13th Nov 2016, 06:45
Replies: 230
Views: 73,205
Posted By Birdy2

Yes JD, im sober now. ;) And for a blade to hit...

Yes JD, im sober now. ;)
And for a blade to hit the boom is one thing, but to slice any part of the cab is way past the teetering range, shearing tusks n all.

While low/0 G is an obvious no no...
Forum: Rotorheads
11th Nov 2016, 20:24
Replies: 230
Views: 73,205
Posted By Birdy2

Not sure why you would want that information...

Not sure why you would want that information Birdy
Working on a hunch Crab.
I know the configuration of the Robbi head, i just need the specs.
I also know theres ample control authority......... .
Forum: Rotorheads
11th Nov 2016, 04:15
Replies: 230
Views: 73,205
Posted By Birdy2

Iv asked this question on other forums without a...

Iv asked this question on other forums without a responce, could someone here help please?

Interested to know, if someone can help, some head limits on Robbies.
How much stop to stop teetering...
Forum: Rotorheads
9th Nov 2016, 04:11
Replies: 14
Views: 35,475
Posted By Birdy2

So I guess we have to look elsewhere to see...

So I guess we have to look elsewhere to see whether the CH-7, or the CH-77 for that matter, is a safe kit helicopter.
As with most machinery H and H, they are as safe as their human intervention....
Showing results 1 to 16 of 16


 
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