Author Topic: K-4 Flettners (Read 2424 times)

MiloMorai · « **Reply #45 on:** August 02, 2005, 10:09:07 AM »

LOL Kurfy, you are the only with the hysteria with another personal attack.

The number was stated awhile back by Butch in a thread (UBI Zoo maybe) where you tried to claim that Flettners were universally fitted to all 109s from the G onwards.

Naturally you forget those numbers in your quest to show how uber Germany was.

When did the Germans start experimenting with aileron Flettners? You posted a pic of a G-6 in 1943.

Seems your heros, the Germans, could not make them work satisfactorly.

Naturally you ignore, and instead put out your usual crap, so give us some numbers for 109s fitted with aileron Flettners as a percentage of the total of each model.

justin_g · « **Reply #46 on:** August 02, 2005, 10:56:39 AM »

Quote

Originally posted by Kurfürst
On point 2, what was the execution of the spring tabs and the type of ailerons on the F6F? As iirc gripen noted, spring tabs and flettners work differently, though from what I recall they are quite similiar (it`s been long time since I read 868 and I gotto run now) - therefore the effect may vary with ailron type, tab type and area...

Oops!:o

Actually, it says in the report that the loss of performance below 280mph was due to the ailerons max. deflection being reduced by the amount needed to deflect the tabs(spring tabs are wired to the stick, unlike the Flettner). The ailerons could be made to reach full deflection by changing the ratio of stick:aileron movement.

Hmm, The geometry of the 109's aileron/tab is available in the diagram above, but without knowing the ratio of deflection between the tab and aileron, you can't figure out the loss in aileron effectiveness, I think.

KurfÃ¼rst · « **Reply #47 on:** August 02, 2005, 04:04:40 PM »

Justin,

I think I have the deflection angles somewhere, I`ll look it up for you. Could it be that Flettners don`t show this behaviour as spring tabs at low speeds due to different setup? I am asking.

Orka · « **Reply #48 on:** August 02, 2005, 04:59:47 PM »

Here you have. Sorry for bad quality

agent 009 · « **Reply #49 on:** August 03, 2005, 12:00:39 AM »

Interesting stuff. Now if I could figure out how the butterfly flaps worked on the George, life would be good.

FalconSix · « **Reply #50 on:** August 03, 2005, 12:52:24 AM »

We still got a few flying 109s around. Why can't someone just ask the guys flying them?

justin_g · « **Reply #51 on:** August 03, 2005, 04:07:59 AM »

Falconsix: AFAIK none of the existing 109's have Flettner tabs.

Kurfurst: One NACA report on aileron tabs states that the change in lift & drag with the tabs fitted was within their measurement error of +/- 3%. So I think the reduction in performance at low speeds would hardly be noticable with Flettner tabs.

Now we have the geometry & deflection data(thanks Orka), I think that if someone was keen enough to do the maths(and could understand the appropriate formulas:eek: ), they could figure out how much the 109 aileron Flettners reduced the control force.