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Search: Posts Made By: barto
Showing results 1 to 25 of 500
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Forum: Crash & Rebuild
11-13-2006, 12:24 PM
Replies: 10
Views: 1,756
Posted By barto

RE: preflight

Yep, that's actually what I meanth but it was kind of late:)

Bart
Forum: Aerodynamics
11-13-2006, 12:20 PM
Replies: 57
Views: 8,840
Posted By barto

RE: " Ground Effect "

Tailstrikes would also be a problem with airliners trying to do AD.

Bart
Forum: Crash & Rebuild
11-12-2006, 07:33 AM
Replies: 10
Views: 1,756
Posted By barto

RE: preflight

For computer radio users:

- check if you selected the right model BEFORE turning the TX on. Just in case you switch from gas to electro as the engine might start running as soon as the TX is...
Forum: Aerodynamics
11-11-2006, 04:19 AM
Replies: 57
Views: 8,840
Posted By barto

RE: " Ground Effect "

The vortex is actually generated close to the wingtip. This pulls the boundary layer that is on top of the wing towards the tip. As a result you get a thicker boundary layer near the tip which...
Forum: Aerodynamics
11-11-2006, 04:12 AM
Replies: 57
Views: 8,840
Posted By barto

RE: " Ground Effect "

So basically you have proven my point. Aerodynamic braking does not work, i.e. it does not give the shortest landing distance possible.

Bart
Forum: Aerodynamics
11-07-2006, 02:05 PM
Replies: 65
Views: 10,932
Posted By barto

RE: What does washout means?

Well, couldn't really see the humor... spitfire - washout - pilot not flying the plane correctly...

it just was full moon I think, ah well maybe it's because the days are getting shorter:)
...
Forum: Aerodynamics
11-07-2006, 01:58 PM
Replies: 57
Views: 8,840
Posted By barto

RE: " Ground Effect "

Yep, it looks very nice. Did it too with small aircraft, sadly not with a fighter jet.:-)

grtz,
Bart
Forum: Aerodynamics
11-07-2006, 01:46 PM
Replies: 57
Views: 8,840
Posted By barto

RE: " Ground Effect "

I don't know any of the procedures of the Draken but my point was that if you keep the nose of the ground the landing distance will not be shorter. On top of that, with certain aircraft designs,...
Forum: Aerodynamics
11-07-2006, 12:52 PM
Replies: 65
Views: 10,932
Posted By barto

RE: What does washout means?

Negative, it is a way to improve low speed performance, thus allowing for shorter landing distances.

Bart
Forum: Aerodynamics
11-07-2006, 12:48 PM
Replies: 57
Views: 8,840
Posted By barto

RE: " Ground Effect "

Aerodynamic braking means holding the nose off with the main gear on the ground. Just landing with high pitch attitudes is not the same. Aerodynamic braking does not work.

You are correct in...
Forum: RC Gliders, Sailplanes and Slope Soaring
11-06-2006, 02:46 PM
Replies: 4
Views: 2,206
Posted By barto

RE: Wing & Stab Mounting Options

Could you take similar pictures but zoom out a bit more? It's quite hard to see what's pictured...

Bart
Forum: RC Gliders, Sailplanes and Slope Soaring
11-06-2006, 02:27 PM
Replies: 2
Views: 2,180
Posted By barto

RE: Help ID a Roebers Modellbau 4 meter ASW 28?

Hello,

If I'm correct Roebers (german company btw) no longer makes any models, but I'm not sure though. I'll ask around at my club this week-end, there are a few that have a glider made by him....
Forum: Kit Building
11-05-2006, 06:16 AM
Replies: 12
Views: 3,229
Posted By barto

RE: Lanier Ultimate Pitts finished

Looks very nice!

So how did it fly?

Bart
Forum: Aerodynamics
11-01-2006, 10:52 AM
Replies: 65
Views: 10,932
Posted By barto

RE: What does washout means?

Hi,

- induced drag is not responsible for the lift. Induced drag is CAUSED BY having lift. More lift means more induced drag. Induced drag can be reduced by weakening the vortices.

- do you...
Forum: RC Gliders, Sailplanes and Slope Soaring
11-01-2006, 10:33 AM
Replies: 9
Views: 4,489
Posted By barto

RE: Thermofluegel ASW 28

Have a small update:

I started building the tailplane today. Drilled the hole to attach the stabilator, glued and sanded the wingtips to it. Next I will install the elevator and rudder servo.
...
Forum: Aerodynamics
11-01-2006, 10:02 AM
Replies: 9
Views: 9,213
Posted By barto

RE: Tip Stall

Those toblerones are basically stall strips.
As for the buffeting, it is indeed present on a lot of full scale aircraft. It is caused by separated air (due to the impending stall) which is...
Forum: Aerodynamics
11-01-2006, 05:27 AM
Replies: 30
Views: 4,685
Posted By barto

RE: Tip Stalling Airplane

Do you mean adding winglets ?

If so I would not do it. They don't solve the problem of tip stalling. In fact they do exactly the opposite, they make things worse.

Winglets reduce the...
Forum: Aerodynamics
11-01-2006, 05:08 AM
Replies: 65
Views: 10,932
Posted By barto

RE: What does washout means?

I agree, more lift means more drag and YES I did see this at school.

The plane doesn't continue to climb but this is not due to the extra drag only, there's another factor which is more...
Forum: Aerodynamics
10-31-2006, 04:31 PM
Replies: 65
Views: 10,932
Posted By barto

RE: What does washout means?

The reason why your plane balloons when you deploy flaps is because you don't reduce the body attitude (pitch angle, NOT the same as AOA)

L = 1/2 x Rho x V² x S x Cl

If you lower...
Forum: Aerodynamics
10-31-2006, 04:00 PM
Replies: 65
Views: 10,932
Posted By barto

RE: What does washout means?

Fully agree with Tall Paul.
Forum: Tips & Techniques
10-31-2006, 01:25 PM
Replies: 14
Views: 38,720
Posted By barto

RE: improvised thread lock

Nail polish for me:)

Bart
Forum: Aerodynamics
10-31-2006, 01:19 PM
Replies: 65
Views: 10,932
Posted By barto

RE: What does washout means?

What you say it not correct. Wash-out does have a big effect on tip stall! Adding washout to the wingtips will give them a smaller 'angle of incidence'. If you then slow the aircraft down and keep...
Forum: Aerodynamics
10-31-2006, 12:45 PM
Replies: 9
Views: 9,213
Posted By barto

RE: Tip Stall

The effect of CG on stall characteristics is not that big. The main effect it has is: aft cg REDUCES stall speed.

I think that in the case of aerobatic aircraft a bigger reason for (tip)...
Forum: Aerodynamics
10-31-2006, 12:24 PM
Replies: 9
Views: 9,213
Posted By barto

RE: Tip Stall

Just for information, a 'dutch roll' is something totally different and has nothing to do with stalling. It is a stability problem.

Bart
Forum: RC Scale Aircraft
10-24-2006, 02:17 PM
Replies: 5
Views: 1,173
Posted By barto

RE: Looking for Instrument Panel Pics

You could also try www.airliners.net , with a bit of luck you can find detailed cockit pictures.

Bart
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