HE-111 is a glider

[jf1981]

Hi

I discovered the gliding capability of HE-111 while having failed both engines through inadapted cooling (sigh).

Its gliding aptitude is unusually good, I expect a FM issue. It goes like a bird without any power.

[Sven]

Have you seen the size of the wings?

[jf1981]

Hi
I mean the friction are very small, it keeps its speed & alt for very long time.

[Redroach]

yeah, "a very long time" is certainly regarded as a most legitimate measurement nowadays (see various other threads). This sentence surely deserves a major investigation of the whole development team! Quick!

[jf1981]

Originally Posted by Redroach

yeah, "a very long time" is certainly regarded as a most legitimate measurement nowadays (see various other threads). This sentence surely deserves a major investigation of the whole development team! Quick!

Go on measure for yourself, it's simply not realistic.

Report back the results if you want to show the way. Have'nt done that yet, I'll wait till the games get patched to a level where it needs fine-tune before starting to post comments again. There is simply too much work to do on the sim now. I think they'll be dealing with all sorts of things so in few weeks / months time, we'll see certainly quite big difference with now.

[Korn]

You're sending him to measure after you report it? Why didn't you measure it before reporting the issue? It's not hard, just feather your props and see how many km you can glide from 1km and you'll get the glide ratio. Fyi a modern sailplane easily tops 60.

The He111 should glide pretty damn well since it's got very big wings, in fact its wing area is over 50% bigger than say the B25, which is in fact heavier.

[SlipBall]

Originally Posted by jf1981

Hi

I discovered the gliding capability of HE-111 while having failed both engines through inadapted cooling (sigh).

Its gliding aptitude is unusually good, I expect a FM issue. It goes like a bird without any power.

All aircraft can glide even the space shuttle...some jets are not so good at it.

[jf1981]

Originally Posted by Stanger

As you see even a casual observation [...]

Stanger, I guess you did not get that post #12 it's been updated with some measurements & some calculation.

[II./JG1_Wilcke]

Suggested by my CFI, retired Navy Test Pilot, NAWS China Lake.

A good guess for single-engine light (sic...for a twin you have more issues) aircraft is Vx, the best rate of climb speed. But for a better answer:

Flying in calm air, with the engine at idle.

Record your airspeed as and vertical speed vs for at least 3 points - near stall, Vy, Va perhaps. For this purpose, you can just take the ratio of vertical speed to air speed to be L/D.

... Technically you'd need the horizontal component of the airspeed vector, but with realistic errors airspeed will be ok. If you insist, you can correct your airspeed by the factor sqrt( 1- (vs/as)^2 ) assuming of course vs<=as. For as/vs = 2, ( you are descending at 1/2 the airspeed! ) this factor is 0.86 so you can see it's not a big deal.

Given vs in ft/min, as in miles/hour
( mph * 88 = ft/min )

I'll make up some numbers:

VS AS L/D = 88·AS/VS

500 45 7.92

750 90 10.56

1000 110 9.68

If that's still not good enough.. There is a simple formula to create the parabolic approximation f(x) = -ax^2 + bx + c for 3 points... but if you are lazy as I am and/or have more than three points you can use this handy online polynomial regression calculator:

http://www.xuru.org/rt/PR.asp#CopyPaste

Putting in the above numbers, I get f(x) = -a·x2 + b·x + c = -1.273504274·10-3 x2 + 2.097008547·10-1 x + 2.042307692

The best L/D, can be determined by differentiating the above and solving for f'(x) = 0. In general form, I get b/2a, or 82 MPH.

Cool beans.

Any one have a POH for the He-111?

[jf1981]

Hi Wilcke
Could you please add definition of Va, Vx, Vy and POH for me ? Thanks.
I'm not clear with it.