Mue-23 motorglider - Page 2

No Step · Dec 05, 2008, 05:45 PM

Thanks for the offer. But I have Compufoil, and can convert any in the library to .dxf., and I can modify any airfoil 1000 ways. So If I knew what it looked like (and it looks like maybe I will), no problem duplicating it or finding one close to it.

No Step · Dec 29, 2008, 12:31 PM

No further activity. I'm just checking in and letting you all know that in a few days, I'll be away from drawing and building until March. I'll update you all at that time. I'm still waiting for more detailed information. I should have better documentation at that time.

solitairyman · Feb 09, 2009, 06:47 PM

Hi Fred,
The info arrived.
Solitairyman

birdofplay · Feb 09, 2009, 09:00 PM

You should recall that Fred is in Cambodia just now.

Although I havent heard from him in a coupla weeks.

solitairyman · Feb 10, 2009, 09:50 AM

Hi BirdofpRay,
I know and he will get more the moment he will be back

.
Just waiting for a mail though, beginning March...
Till then it will be waiting and waiting for more...

Solitiaryman

No Step · Feb 25, 2009, 06:06 AM

Solitiaryman,... OH BOY! Great news!. Yes, I'm in Vietnam now. I'll be back at my building board in just a few days. Looks like I'll be building several planes at once to catch up,... these vacations are take away too much building time.

No Step · Mar 03, 2009, 01:06 PM

Up early in the morning recovering from jet lag,... what to do?,... Draw! Yeah baby! I took the above factory 3 view and carefully checked and corrected my earlier drawing. Here's what I have so far. All is subject to change with additional information information. Airfoil is definately subject to change. It's started out as a thickened SD8040. Then I saw the 3 view and I thickened it some more. I'm not sure if I will stay with it,... and also I'm thinking of transitioning to a thinner airfoil at the tips. Right now, it's guess work.

Looking at the 3-view, I'm thinking it might have spoilers on the bottom surface of the wings too, well fwd of the top spoilers. Ugh,... that'd be a lot more work,... awaiting more information.

GeeW · Mar 03, 2009, 02:05 PM

Fred
I have a feeling that the Mu23 has DFS type airbrakes...I cant find the image right now but in one of the (few) images it shows a partially extended airbrake....

EDIT
What a lemon I am!

The above 3 view shows it clearly as DFS type. The airbrakes are on both upper and lower surfaces.

EDIT#2
This http://scalesoaring.co.uk/VINTAGE/Do...es/3View_1.jpg
shows the DFS airbrake nicely on the Weihe.

No Step · Mar 03, 2009, 02:33 PM

Ah, like this.

Edit: you beat me by a minute

Yep, I think you are right. Thanks, never heard of them before.

GeeW · Mar 03, 2009, 03:20 PM

Fred
The nice thing about that type of airbrake (full size) is the low operating forces compared to the Schemp Hirth type as per K-13. Mind you, that linkage and geometry will keep you quiet for a while!

Gordon

No Step · Mar 03, 2009, 04:30 PM

Hopefully there's enough room to put a small servo in the middle with a dual servo arm and just run adjustable linkage fore and aft (actually just one would need to be adjustable). That'll be my plan.

birdofplay · Mar 03, 2009, 10:33 PM

Fred !!! Your Back !!! :-)

AMBeck · Mar 03, 2009, 10:57 PM

I understand that the Mu airfoil was designed by Egon Scheibe when he was a student at Munchen. It was used for all the non-laminar flow Mu sailplanes from at least the Mu-13, and on a lot of Scheibe sailplanes and motorgliders before the SF-34. Several years ago, I got the plans for the Mu-17 from Akaflieg Munchen. No airfoil coordinates were included. They said to measure a Bergfalke. Luckily, there was one nearby. I'll dig the coordinates up if you'd like. The section has a large LE radius and slight undercamber and is about 13% thick as I recall. It would be very easy to build with a plywood wrapped D box LE. However, it wouldn't be very good on a model.

No Step · Mar 04, 2009, 11:07 AM

Well thank you very much, but I >think< I have that information already coming from Noel Rumers in Belgium.

ShredAir · Mar 04, 2009, 06:23 PM

Fred, welcome back!
You started this thread when we were in Costa Rica (I think), and I found it just now sitting here in warm, pleasant Medellín.
Looks like Noel is helping you out competently, and I'd like to offer my help also. So if you'd like me to correspond with Akaflieg München (or any other German source) on your behalf, please let me know.
This is a great project, and knowing you, it'll turn out great. For your creativity and can-do approach to tasks, I've always looked up to, and not just because I'm a SLS (short little sh... : )

Dieter Mahlein, ShredAir

Feb 09, 2009, 06:47 PM	#18
solitairyman Registered User Join Date: Oct 2007 Posts: 112	Mü 23 Hi Fred, The info arrived. Solitairyman Attached Thumbnails 3 view drawing 45.6 KB · Views: 199

Feb 10, 2009, 09:50 AM	#20
solitairyman Registered User Join Date: Oct 2007 Posts: 112	Saurier Mü 23 Hi BirdofpRay, I know and he will get more the moment he will be back . Just waiting for a mail though, beginning March... Till then it will be waiting and waiting for more... Solitiaryman

Mar 03, 2009, 01:06 PM	#22
No Step My hanger is full Join Date: May 2003 Location: Everett, Washington Posts: 2,681	Up early in the morning recovering from jet lag,... what to do?,... Draw! Yeah baby! I took the above factory 3 view and carefully checked and corrected my earlier drawing. Here's what I have so far. All is subject to change with additional information information. Airfoil is definately subject to change. It's started out as a thickened SD8040. Then I saw the 3 view and I thickened it some more. I'm not sure if I will stay with it,... and also I'm thinking of transitioning to a thinner airfoil at the tips. Right now, it's guess work. Looking at the 3-view, I'm thinking it might have spoilers on the bottom surface of the wings too, well fwd of the top spoilers. Ugh,... that'd be a lot more work,... awaiting more information. Attached Thumbnails 60.3 KB · Views: 103 9.1 KB · Views: 48 49.8 KB · Views: 73 21.9 KB · Views: 59 Last edited by No Step; Mar 03, 2009 at 01:48 PM.

Mar 03, 2009, 02:05 PM	#23
GeeW SB-28 UK Display Pilot Join Date: Jul 2001 Location: ENGLAND Posts: 1,447	Fred I have a feeling that the Mu23 has DFS type airbrakes...I cant find the image right now but in one of the (few) images it shows a partially extended airbrake.... EDIT What a lemon I am! The above 3 view shows it clearly as DFS type. The airbrakes are on both upper and lower surfaces. EDIT#2 This http://scalesoaring.co.uk/VINTAGE/Do...es/3View_1.jpg shows the DFS airbrake nicely on the Weihe. Last edited by GeeW; Mar 03, 2009 at 02:32 PM.

Mar 03, 2009, 02:33 PM	#24
No Step My hanger is full Join Date: May 2003 Location: Everett, Washington Posts: 2,681	Ah, like this. Edit: you beat me by a minute Yep, I think you are right. Thanks, never heard of them before. Attached Thumbnails this is not the Mu-23 but something I found on the net searching DFS spoilers. 110.4 KB · Views: 149

Dec 05, 2008, 05:45 PM	#16
No Step My hanger is full Join Date: May 2003 Location: Everett, Washington Posts: 2,681	Thanks for the offer. But I have Compufoil, and can convert any in the library to .dxf., and I can modify any airfoil 1000 ways. So If I knew what it looked like (and it looks like maybe I will), no problem duplicating it or finding one close to it.

Dec 29, 2008, 12:31 PM	#17
No Step My hanger is full Join Date: May 2003 Location: Everett, Washington Posts: 2,681	No further activity. I'm just checking in and letting you all know that in a few days, I'll be away from drawing and building until March. I'll update you all at that time. I'm still waiting for more detailed information. I should have better documentation at that time.

Feb 09, 2009, 09:00 PM	#19
birdofplay RC since 1968 Join Date: Dec 2005 Location: Cathlamet WA Posts: 3,273	You should recall that Fred is in Cambodia just now. Although I havent heard from him in a coupla weeks.

Feb 25, 2009, 06:06 AM	#21
No Step My hanger is full Join Date: May 2003 Location: Everett, Washington Posts: 2,681	Solitiaryman,... OH BOY! Great news!. Yes, I'm in Vietnam now. I'll be back at my building board in just a few days. Looks like I'll be building several planes at once to catch up,... these vacations are take away too much building time.

Mar 03, 2009, 03:20 PM	#25
GeeW SB-28 UK Display Pilot Join Date: Jul 2001 Location: ENGLAND Posts: 1,447	Fred The nice thing about that type of airbrake (full size) is the low operating forces compared to the Schemp Hirth type as per K-13. Mind you, that linkage and geometry will keep you quiet for a while! Gordon

Mar 03, 2009, 04:30 PM	#26
No Step My hanger is full Join Date: May 2003 Location: Everett, Washington Posts: 2,681	Hopefully there's enough room to put a small servo in the middle with a dual servo arm and just run adjustable linkage fore and aft (actually just one would need to be adjustable). That'll be my plan.

Mar 03, 2009, 10:33 PM	#27
birdofplay RC since 1968 Join Date: Dec 2005 Location: Cathlamet WA Posts: 3,273	Fred !!! Your Back !!! :-)

Mar 03, 2009, 10:57 PM	#28
AMBeck Registered User Join Date: Nov 2007 Location: Charleston, SC Posts: 132	I understand that the Mu airfoil was designed by Egon Scheibe when he was a student at Munchen. It was used for all the non-laminar flow Mu sailplanes from at least the Mu-13, and on a lot of Scheibe sailplanes and motorgliders before the SF-34. Several years ago, I got the plans for the Mu-17 from Akaflieg Munchen. No airfoil coordinates were included. They said to measure a Bergfalke. Luckily, there was one nearby. I'll dig the coordinates up if you'd like. The section has a large LE radius and slight undercamber and is about 13% thick as I recall. It would be very easy to build with a plywood wrapped D box LE. However, it wouldn't be very good on a model.

Mar 04, 2009, 11:07 AM	#29
No Step My hanger is full Join Date: May 2003 Location: Everett, Washington Posts: 2,681	Well thank you very much, but I >think< I have that information already coming from Noel Rumers in Belgium.

Mar 04, 2009, 06:23 PM	#30
ShredAir slope'n the Colombian Andes Join Date: Mar 2001 Location: Girardota, Colombia Posts: 3,699	Fred, welcome back! You started this thread when we were in Costa Rica (I think), and I found it just now sitting here in warm, pleasant Medellín. Looks like Noel is helping you out competently, and I'd like to offer my help also. So if you'd like me to correspond with Akaflieg München (or any other German source) on your behalf, please let me know. This is a great project, and knowing you, it'll turn out great. For your creativity and can-do approach to tasks, I've always looked up to, and not just because I'm a SLS (short little sh... : ) Dieter Mahlein, ShredAir