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Search: Posts Made By: HazelNuts39
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Forum: Tech Log
28th Nov 2012, 11:13
Replies: 147
Views: 30,456
Posted By HazelNuts39

The original post just says "in the air". That...

The original post just says "in the air". That isn't necessarily cruise, what about other flight conditions such as holding or approach? What speeds are you at when holding?
Forum: Tech Log
27th Nov 2012, 11:34
Replies: 147
Views: 30,456
Posted By HazelNuts39

... if the brakes are too weak to lock the wheels...

... if the brakes are too weak to lock the wheels or to activate the ABS.
Forum: Tech Log
26th Nov 2012, 14:34
Replies: 147
Views: 30,456
Posted By HazelNuts39

Equation (9) in the paper referenced in post#27...

Equation (9) in the paper referenced in post#27 gives the minimum drag speed Vmd. It corresponds to a lift coefficient equal to √(Cd0/K).

If Vmd1 and Vmd2 are the minimum drag speeds at different...
Forum: Tech Log
26th Nov 2012, 07:35
Replies: 147
Views: 30,456
Posted By HazelNuts39

Hi mm43, Thank you for sharing your exciting...

Hi mm43,

Thank you for sharing your exciting experiment. Thomas, the heavier engine in the first test, stopped in the shorter distance?

Bye,

The problem lies not in the use of the word...
Forum: Tech Log
25th Nov 2012, 10:29
Replies: 147
Views: 30,456
Posted By HazelNuts39

Hi John, Thank you for your intervention. I...

Hi John,

Thank you for your intervention. I wasn't prepared for the emotional response to my remark. I shouldn't have made it and regret that I did.

Regards,
HN
Forum: Tech Log
25th Nov 2012, 09:13
Replies: 147
Views: 30,456
Posted By HazelNuts39

Let's study that in some detail. Presumably the...

Let's study that in some detail. Presumably the speeds achieved by your 3 year old grandson were low enough for the aerodynamic drag to be insignificant. So the retarding force is the result of the...
Forum: Tech Log
24th Nov 2012, 16:43
Replies: 147
Views: 30,456
Posted By HazelNuts39

Dear mr Bye, I'm not aware of anything in my...

Dear mr Bye,

I'm not aware of anything in my writing that calls for the apology you ask for. I've pointed to an incongruence that I perceive between your claim of being an engineer and the...
Forum: Tech Log
24th Nov 2012, 12:07
Replies: 147
Views: 30,456
Posted By HazelNuts39

Bye, I'm just quoting the facts as you wrote...

Bye,

I'm just quoting the facts as you wrote them in your posts. It is up to the reader to form his/her opinion about your sincerity in this debate.

If you're not playing the game of trolling,...
Forum: Tech Log
24th Nov 2012, 10:26
Replies: 147
Views: 30,456
Posted By HazelNuts39

Dave, We're debating with a person who...

Dave,

We're debating with a person who claims to be an engineer designing aero engines yet writes such nonsense as (see his first post #15 on this thread):

Then states his objective as:...
Forum: Tech Log
24th Nov 2012, 09:21
Replies: 147
Views: 30,456
Posted By HazelNuts39

There are only two forces acting on a glider: an...

There are only two forces acting on a glider: an aerodynamic force and a gravitational force. The gravitational force is directed towards the center of the earth and is equal to the product of mass m...
Forum: Tech Log
24th Nov 2012, 08:11
Replies: 147
Views: 30,456
Posted By HazelNuts39

Urbandictionary.com:

Urbandictionary.com:
Forum: Tech Log
23rd Nov 2012, 20:13
Replies: 147
Views: 30,456
Posted By HazelNuts39

Well ... The two aircraft shown in post #49...

Well ...

The two aircraft shown in post #49 have the same L/D at about 226 kts. At that speed, and only at that speed, both airplanes slow down at the same rate. As the speed reduces below 226...
Forum: Tech Log
23rd Nov 2012, 15:36
Replies: 147
Views: 30,456
Posted By HazelNuts39

That is true at any speed. For the variation of...

That is true at any speed. For the variation of L/D in Owain Glyndwr's graph the wing's aspect ratio (roughly the ratio between wing span and average chord length) determines the efficiency of...
Forum: Tech Log
23rd Nov 2012, 06:39
Replies: 147
Views: 30,456
Posted By HazelNuts39

yippy ki yay, If I understand you correctly,...

yippy ki yay,

If I understand you correctly, I think you agree with Microburst and me. Just a small correction:
Actually, above the minimum drag speed the heavier aircraft will have more total...
Forum: Tech Log
22nd Nov 2012, 22:45
Replies: 147
Views: 30,456
Posted By HazelNuts39

Semantics

According to Wikipedia:
Forum: Tech Log
22nd Nov 2012, 22:26
Replies: 147
Views: 30,456
Posted By HazelNuts39

If you have, I don't get it. Must be my fault.

If you have, I don't get it. Must be my fault.
Forum: Tech Log
22nd Nov 2012, 21:53
Replies: 147
Views: 30,456
Posted By HazelNuts39

Bye, How do your remarks make untrue what I...

Bye,

How do your remarks make untrue what I wrote, that the maximum braking force is determined by either the maximum that the brake can produce, or the maximum that the tire/runway friction can...
Forum: Tech Log
22nd Nov 2012, 21:18
Replies: 147
Views: 30,456
Posted By HazelNuts39

Not necessarily, it depends on the brakes and the...

Not necessarily, it depends on the brakes and the friction available between tires and road surface. That's why I added the caveat 'brakes sufficiently powerful'. The maximum retarding force from a...
Forum: Tech Log
22nd Nov 2012, 20:37
Replies: 147
Views: 30,456
Posted By HazelNuts39

SMOC states Newton's second law as: F=MA. It...

SMOC states Newton's second law as: F=MA. It relates force F, mass M and acceleration A. Energy doesn't come into it.

Extricate's questions in posts #1 and #5 are about A, which equals F/M. F is...
Forum: Tech Log
22nd Nov 2012, 19:23
Replies: 147
Views: 30,456
Posted By HazelNuts39

Bye, Post #2 states the 'basic physics'. ...

Bye,

Post #2 states the 'basic physics'.
F/M is 'basic' aerodynamics.
Your analogy doesn't address either one.
Forum: Tech Log
22nd Nov 2012, 17:47
Replies: 147
Views: 30,456
Posted By HazelNuts39

I'm wondering if your simple analogy explains...

I'm wondering if your simple analogy explains that the heavier aircraft slows down more rapidly than the lighter aircraft below the minimum drag speed.

Regards,
HN
Forum: Tech Log
22nd Nov 2012, 15:40
Replies: 147
Views: 30,456
Posted By HazelNuts39

Yes you can, up to a point. The retarding force...

Yes you can, up to a point. The retarding force that can be derived from the friction between tires and road increases proportionally to the load that the weight exerts on the road. Provided the...
Forum: Tech Log
21st Nov 2012, 16:30
Replies: 147
Views: 30,456
Posted By HazelNuts39

The green dot speed varies with weight, the green...

The green dot speed varies with weight, the green dot AoA does not.
Forum: Tech Log
21st Nov 2012, 15:59
Replies: 147
Views: 30,456
Posted By HazelNuts39

I'm assuming you're comparing two aircraft of the...

I'm assuming you're comparing two aircraft of the same type at different weights. I'm also assuming that the deceleration is in level flight and that engine thrust at idle is negligible.

Then it...
Showing results 1 to 24 of 24


 
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