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Old Oct 15, 2006, 12:34 PM
W4UAV
Gainesville, FL
Joined Nov 2005
1,043 Posts
Discussion
Twin Boom electric for AP - new fuselage

This is a new fuse for the orange and black twin boom I have been using for AP, I was getting heat buildup inside the fuse, as ambient temps rose (a month ago) the ESC would shut off. I was getting close to maxxing the 40 amp ESC out already. I made the entire fuse a tunnel and a big exit for the air just below the AXI. I get great airflow even static with the motor running, if this hadnt worked I was going to buy a 70 amp. It flew great yesterday, this fuse is a little shorter, balances good and flies great. I also switched to bolt on wing, I hate rubber bands!
Mike
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Old Oct 15, 2006, 12:36 PM
W4UAV
Gainesville, FL
Joined Nov 2005
1,043 Posts
Heres a family pic with the Grey Ghost:
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Old Oct 15, 2006, 12:44 PM
Professor of Wood
kd7ost's Avatar
Nampa. Idaho
Joined Nov 2004
4,266 Posts
Looks great Mike,

The Orange and Black covering is reminisant of Dave Jones' boomerang.

Dan
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Old Oct 15, 2006, 12:59 PM
W4UAV
Gainesville, FL
Joined Nov 2005
1,043 Posts
Yes, he got me hooked on that color scheme, that wing has been on 5 different planes, three crashed leaving the fuses destroyed but the wing survived unscathed every time. Weird.
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Old Oct 15, 2006, 04:08 PM
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Rich Hill Missouri 64779
Joined Nov 2003
8,399 Posts
Those are simply great looking planes. Looking forward to some AP with them and some video.
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Old Oct 15, 2006, 06:05 PM
Registered User
United States, AL, Foley
Joined Nov 2005
539 Posts
Good lookin fleet ya got there Mike. As Greg says, "another tool for the trade"

Look forward to some pics soon.


Tommy Patterson
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Old Oct 15, 2006, 07:53 PM
W4UAV
Gainesville, FL
Joined Nov 2005
1,043 Posts
Thanks QB, Dan and Tom.
I think I already have a client interested in some rural acreage shots. He saw the test flight and was about as impressed as I was.
I thought Id lost him, we had talked a month or so ago. A flying buddy of mine said I went into a different mode when I found out the guy was a realtor, "business mode" I guess youd call it.
Thanks guys, Ill post pics when I get them.
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Old Oct 15, 2006, 09:11 PM
Registered User
Fullerton, CA
Joined Feb 2005
36 Posts
Those are great looking planes, almost exactly what I've been thinking about building. Could you furnish some dimensions, airfoil type & motor size. What type of material are you using for the booms? Looks like your not running rudders, how does it fly? Do you need much runway for takeoff and landing?

Gary
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Old Oct 15, 2006, 09:49 PM
W4UAV
Gainesville, FL
Joined Nov 2005
1,043 Posts
Airfoil is a Clark-Y, the wings are from the Tower Hobbies Trainer 40, the booms are of balsa, 36" from leading edge to elevator, Grey Ghost has an OS .32 helicopter engine, the Mantis (Orange/Black) is running on an AXI 2826/10 using 4cell lipolys at 3500-4000 mah, takeoff do need to roll out a bit, they fly very stable and predictable.
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Old Oct 15, 2006, 11:16 PM
Registered User
Fullerton, CA
Joined Feb 2005
36 Posts
RaptorAP
Thanks for the info, I'm going to start on one as soon as I can get the parts together.
Another question, how does it glide, how long of flight times are you getting?

Gary
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Old Oct 15, 2006, 11:50 PM
Firefighter
tysons's Avatar
Newark, Ohio
Joined Sep 2006
546 Posts
FYI Just thought I would post this.

I read up on the clark Y, I think the tower hobbies wing is a flat bottom.

http://www.gliders.dk/clark_y.htm

"This is the real Clark Y – Clark Y for men. There is no such thing as a “flat-bottomed Clark-Y”. If you ever hear anybody say “flat-bottomed Clark-Y”, you now know they are pufters and that they are talking of a home made Aquila type airfoil – i.e. a flat bottom and a curved top – you instantly know that they are aerodynamic ignorants compared to yourself and their aerodynamic wisdom is what you read on a box of cereals every morning. The Clark Y is a real airfoil with curves like a lady and just straight enough to be a joy to handle on a flat table."
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Old Oct 16, 2006, 03:38 AM
Firefighter
tysons's Avatar
Newark, Ohio
Joined Sep 2006
546 Posts
I thought this was pretty cool again FYI


http://webpages.charter.net/rcfu/HelpsHints/ModDgn.html


Airfoil Type
AIRFOIL SHAPE CHARACTERISTIC
Flat Bottom Slow, docile, forgiving, poor inverted flight
Semi-symmetrical Good lift, penetration, aerobatic, and inverted flight
Symmetrical Best aerobatic and inverted flight
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Old Oct 16, 2006, 06:38 AM
W4UAV
Gainesville, FL
Joined Nov 2005
1,043 Posts
I had a feeling when I posted that it was wrong, I knew someone would correct me if it indeed was wrong.
They both have a flat bottom trainer wing, I hate building wings so I use ARF wings, takes less time.
Thanks tysons.
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Old Oct 16, 2006, 07:17 AM
Professor of Wood
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Nampa. Idaho
Joined Nov 2004
4,266 Posts
Other than a few positive ordinances under and behind the LE, the Clark Y is considered a flat bottomed airfoil. It is not under cambered, it is not semi or fully symmetrical.

Dan
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Old Oct 16, 2006, 09:32 AM
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Greg McNair's Avatar
Birmingham, AL
Joined Aug 2003
945 Posts
Nice job Mike, now you need to make it ducted fan with that big ol' hole.

Hey, did ya get many photos of the Gator fans as they returned from Auburn?
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