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Dec 07, 2012, 07:58 PM
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Pat Daily's Avatar
Mark

It looks like fun! Nice plane--anxious to see it in the air.
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Dec 07, 2012, 08:31 PM
Gravity sucks.
mrittinger's Avatar
Quote:
Originally Posted by Chad Veich View Post
Don't let the color scheme of the airplane as depicted on the shirt sway your decision Mark. Stay the course!

LOL Well.....we won't know till its time for covering.
Curious though, if anyone has tried putting HVAC foil tape over Doculam?

Mark
Dec 08, 2012, 09:53 AM
D.G.B.
KOMET 44's Avatar
Mark,I picked up this link from the "OTHER SITE"
http://www.taichiunlimiteddrawings.com/ Yes I purchased the precious metal drawings and color picture.A friend of mine gave me the H9 40size mustang after he had a less then purfect flight.I have it in the project pile.I plan to use the next size up himax counter rotating motor set up.I'll keep watching.I heard P/M did good at the air races this year.
stefanP
Dec 08, 2012, 11:13 AM
Gravity sucks.
mrittinger's Avatar
Sounds like a fun project. Those are good drawings.
Lot of differences from a D model....
Oh, its Contra-rotating on one shaft. Counter- rotating is two opposite props on two seperate engines.
Dec 08, 2012, 05:44 PM
Gravity sucks.
mrittinger's Avatar
Tinkering away with the plans, fuselage former templates now that I have motors and mount...
Dec 08, 2012, 10:45 PM
Gravity sucks.
mrittinger's Avatar
http://ntrs.nasa.gov/archive/nasa/ca...1983002859.pdf

Quite a read! But, if I read the final finding correctly, they determined only 1.1% to 5% rotational pitch differential between front and reat to be optimal, and no real benefit from running the rear prop smaller.
Theres a lot of info in there on sweep of blades (rearward and FORWARD!), pitch,diameter, rotational airflow,Stators,drag,load division, and noise. Pretty interesting.
They call them couter-rotating lol, I was always told counter was two motors, contra was one.
Mark
Dec 10, 2012, 08:13 PM
Gravity sucks.
mrittinger's Avatar
I wonder if the team will change her wingtips?

http://www.dtic.mil/dtic/tr/fulltext/u2/a800374.pdf
Dec 10, 2012, 09:09 PM
GOTTA FLY STRIGHT UP
WILLIAM M's Avatar
Quote:
Originally Posted by mrittinger View Post
I wonder if the team will change her wingtips?

http://www.dtic.mil/dtic/tr/fulltext/u2/a800374.pdf
Mark

Thanks for the link on tip design. I read it all.

Now I am wondering. As I understood the drooped tip, it moved the vortex outward and reduced stalling effect and drag.
Is that correct??

Bill
Dec 10, 2012, 09:50 PM
Gravity sucks.
mrittinger's Avatar
According to this, no. 5 was the best tip shape for increasing effective aspect ratio and lowering drag.
I know Hoerner did a lot of tip research, and I read an article a long time ago that had drooped Hoerner desgned tip info, and while it had higher drag, it had very good slow flight characteristics. I used them on the Sportwin and SuperSportwin, and they do seem to provide just that....
Mark
Dec 11, 2012, 08:27 AM
GOTTA FLY STRIGHT UP
WILLIAM M's Avatar
Mark

Thanks for clarifying that. The sloooow flight characteristics is what I need. I have been told how to recover from a stall, but it seems I'm always too low. and have crash a few because of that.

Bill
Last edited by WILLIAM M; Dec 11, 2012 at 08:33 AM.
Dec 11, 2012, 09:06 AM
Gravity sucks.
mrittinger's Avatar
Simple tip plates hanging down from the wing are less elegant but just as effective.
Dec 13, 2012, 07:44 PM
Gravity sucks.
mrittinger's Avatar
Have the fuse sides on and drying, nose bottom block cut, and stab-ele cut out.
Should be able to install the nose chin block tomorrow, and then remove it from the board.
Mark
Dec 13, 2012, 09:22 PM
Electric Coolhunter
Thomas B's Avatar
Quote:
Originally Posted by mrittinger View Post
http://ntrs.nasa.gov/archive/nasa/ca...1983002859.pdf

Quite a read! But, if I read the final finding correctly, they determined only 1.1% to 5% rotational pitch differential between front and reat to be optimal, and no real benefit from running the rear prop smaller.
Theres a lot of info in there on sweep of blades (rearward and FORWARD!), pitch,diameter, rotational airflow,Stators,drag,load division, and noise. Pretty interesting.
They call them couter-rotating lol, I was always told counter was two motors, contra was one.
Mark
Well, some real aircraft with just one contra prop assembly do have two engines driving them...the Convair Tradewind (8 jets turning 4 props) and the Bugatti 100 come to mind.
Latest blog entry: 2014 events and travel
Dec 14, 2012, 11:10 AM
Gravity sucks.
mrittinger's Avatar
Germans had a bomber with two motors geared to one shaft,what do we call that? Lol


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