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Search: Posts Made By: alwynhartman
Showing results 1 to 18 of 18
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Forum: Rotorheads
18th Oct 2012, 23:19
Replies: 9
Views: 3,407
Posted By alwynhartman

Ha Ha! Quite!

Ha Ha! Quite!
Forum: Rotorheads
17th Oct 2012, 23:51
Replies: 9
Views: 3,407
Posted By alwynhartman

Thank you to all who took the time to reply! ...

Thank you to all who took the time to reply!

I have indeed purchased copies of Prouty's work and Leishman's textbook (including the answer set to the questions).

The studying has been slow...
Forum: Rotorheads
12th Oct 2012, 04:51
Replies: 39
Views: 17,571
Posted By alwynhartman

Saro Skeeter endearing qualities

Does anyone have any insight regarding the Skeeter's flight characteristics? Anything that was particularly troublesome or strangely well mannered?
Forum: Rotorheads
8th Jun 2012, 00:33
Replies: 4
Views: 1,402
Posted By alwynhartman

So, I seem to have answered the question myself....

So, I seem to have answered the question myself. Please feel free to critique.
Consider the following, design parameters:
MTOW 700 kg
Rotor Dia 7 m
Chord 0.18 m
Number of blades 3
Tip speed 192...
Forum: Rotorheads
7th Jun 2012, 23:16
Replies: 4
Views: 1,402
Posted By alwynhartman

Well SAS, I thought it would be interesting to...

Well SAS, I thought it would be interesting to see how performance would compare if only one variable was changed, in this case, an extra rotor. To introduce overlap (proper practice or not) would...
Forum: Rotorheads
6th Jun 2012, 23:35
Replies: 4
Views: 1,402
Posted By alwynhartman

Tandem vs single

So heres the skinny,
Lets suppose for a moment that there exists two complete airframes with identical mtow and empty weight

Which of the two ships will exhibit better overall performance if one...
Forum: Rotorheads
6th Dec 2011, 03:18
Replies: 6
Views: 1,347
Posted By alwynhartman

So the consensus seems to be that they are only...

So the consensus seems to be that they are only really useful when the turn is steep and tight but during level flight they can, in certain cases, prove to be a source of irritation.

Thanks! I...
Forum: Rotorheads
6th Dec 2011, 00:33
Replies: 6
Views: 1,347
Posted By alwynhartman

Upward visibility?

Why is visibility above the helicopter from the pilot seat important? Ive heard that one of the drawbacks that tandem helicopters like the HUP and particularly the JOV-3 and MC-4 had was that the...
Forum: Rotorheads
20th Nov 2011, 06:02
Replies: 22
Views: 9,688
Posted By alwynhartman

How effective is a wire strike protection...

How effective is a wire strike protection installation when a helicopter flies into a power line or telephone line at speed?

What are the general limitations of such systems eg, max wire...
Forum: Rotorheads
15th Nov 2011, 10:21
Replies: 17
Views: 2,297
Posted By alwynhartman

Perhaps, but the scientific mind yearns to explore

Perhaps, but the scientific mind yearns to explore
Forum: Rotorheads
14th Nov 2011, 21:57
Replies: 17
Views: 2,297
Posted By alwynhartman

Hillberg, thanks for that! History as a tendancy...

Hillberg, thanks for that! History as a tendancy to repeat itself but thanks for letting me know the research has been a documented failure! I was on my way to constructing a test piece and doing my...
Forum: Rotorheads
14th Nov 2011, 00:16
Replies: 17
Views: 2,297
Posted By alwynhartman

Hillberg, would you be so kind as to clarify...

Hillberg, would you be so kind as to clarify perhaps?
Forum: Rotorheads
14th Nov 2011, 00:08
Replies: 17
Views: 2,297
Posted By alwynhartman

I think I may have answered my own question. ...

I think I may have answered my own question.
Correct me if Im wrong but it seems that as long as the center of pressure / center of lift, as measured over the span of each blade, is higher than the...
Forum: Rotorheads
13th Nov 2011, 11:20
Replies: 17
Views: 2,297
Posted By alwynhartman

I see what you are saying AC but the idea is to...

I see what you are saying AC but the idea is to try fathom how flight with such a system might feel.

The idea came as a comparison of di-hedral vs an-hedral in fixed wing aircraft. Anhedral is...
Forum: Rotorheads
13th Nov 2011, 10:05
Replies: 17
Views: 2,297
Posted By alwynhartman

Maybe I dont fully understand the Hookes Joint...

Maybe I dont fully understand the Hookes Joint effect but if I understand it correctly then in the Bell / Robinson system the following occurs (please correct me if Im wrong): When the advancing...
Forum: Rotorheads
13th Nov 2011, 09:13
Replies: 17
Views: 2,297
Posted By alwynhartman

Aside from the obvious complication of the rotor...

Aside from the obvious complication of the rotor teetering over to its extreme angle when it slows, and lets just suppose that it can be built not to do that during start-up and shut down, how will...
Forum: Rotorheads
13th Nov 2011, 06:53
Replies: 17
Views: 2,297
Posted By alwynhartman

"Upside down" teetering rotor

What would the theoretical flight dynamics be if (in a two bladed head) the teetering hinge was upside down so that the pivot lies below the blade grips (as measured from the ground) rather than...
Forum: Rotorheads
9th Mar 2011, 00:26
Replies: 9
Views: 3,407
Posted By alwynhartman

Rotor Calculation

Hello everyone, this is my first post!
Im an English teacher in Japan with some time on his hands and as an intellectual exercise would like to design a theoretical helicopter.

Does anyone...
Showing results 1 to 18 of 18


 
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