How can she be shy if she is a slu..

Oh.. wait one..

slats!

My bad.. thought you were talking about something else! ;)

109 E plane description says they should extend at 180 km/h.

Here are the values the RAE determined in Flight test Source AVIA 6/2394 BF109E Evaluation

http://img824.imageshack.us/img824/7522/raeslats.jpg

These are 1G values. So slat deployment under G will be Whatever number you use (ASI or trailing) from these x SQR of the G

There is plenty of Mtt data on it.

So how about posting some here for us to peruse. The more data we have the better. Ideally Slat development AOA's .

This is Bf-109E-3 V24 WNr 1929 from April 1940. The report is titled, "Drag and Measurements" and this polar is the aircraft in "normal" condition.

"Normal" by RLM definition means it was a little worse than the finish of an aircraft just off the production line and is intended to representative of an operational aircraft in mid-life. Sort of like the USAAF's "combat weight" (~60% fuel/oil) is intended to depict an operational aircraft encountering the enemy during the target portion of the mission profile.

The polar gives excellent agreement with the RAE measurements. It takes the Clmax out a few decimal places from the RAE report (~1.45), refines the opening CL(~.84), and gives you the 2D AoA(~17.5 degrees). The slats begin to open at about 8 degrees and are fully deployed by ~11.5 degrees. The wing is stalled at ~17.5 degrees with the body angle of course being the induced AoA + Angle of incidence.

http://img33.imageshack.us/img33/8166/v24windk4.jpg

It should help considerably.

A pretty good match with the simple statement in the 109E description, all things considered.

Regardings Crumpps chart, "Spaltklappen" and "Spreizklappen" are two different types of flaps, not leading edge slats. The slats don't open gradually. But from that polar and the RAF test, it should be easy to derive the AoA of ~ 8° at which they bang open.

Who cares and totally irrelevant to anything I posted. I know that and anyone who reads German knows it as well.

Neither of those polars is even in the discussion nor included in the values presented.

Baloney.

The slats open as required and the amount can be precisely controlled by the pilot. From open to close in the Bf-109 is ~2.5 degrees of angle of attack. A pilot can move through than little amount of angle so fast it would seem that they either open or closed. The reality is a pilot can control them and they will only open the amount required. If you knew how to read a polar, you would know that as the shape of the curve would depict it if the slats could only be fully open or fully closed. Simply put, there would be a shift in the polar and not a smooth transition.

Just how many hours do you have flying an aircraft equipped with slats? I can tell you, you have NONE as you don't know how they work at all. You have never been up in an airplane equipped with them either. Stop presenting erroneous information as fact.

I have about 400 hours flying a plane equipped with slats that work just like the Bf-109's.

It is called a "stick" and it is there for the pilot to command the airplane. This is me piloting my airplane a few years ago.

http://www.youtube.com/watch?v=-vbqgfjyW2Q

Is the radiator and intake flaps, btw....

Polar represents landing flaps at 60 degrees and the influence of the radiator and intake flap settings.

Are you sure? I think Spreizklappen are slotted trailing edge flaps whereas spaltklappen are split flaps. I understood these polars to be from tests of an E-3 for evaluating different alternatives to be included on the F-series as components (in this case different flap designs).

Image for those not familiar with different types of flaps