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Old Oct 06, 2014, 07:44 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,676 Posts
Build Log
Pitts Special 4 channel VLF style

I love the new UMX Pitts Special by Horizon, and was tempted to make the purchase. However, I have found with all the UMX planes that I have owned, I grew tired of them for one reason or another.

So here was the challange. To create a 4 channel Pitts Special that could utilize a variety of power systems and be relatively easy to recreate. This is what I came up with;

Pitts Special S-1 Biplane
Wingspan - 22.25"
Wing Area - 164 sq. in.
Motor - 24g KEDA 1500 Kv (currently testing with)
ESC - 10A Turnigy Plush
Servos - Three 5g units
AUW - 8.7 oz. with a 750 mAh 3s battery

Initial flight tests were positive with some final CG adjustments needing to be validated under better conditions.

Ken



Here is the initial fit up and sanding of the airframe. Sanding takes a little time, but really yields great results in terms of appearance and reducing mass aft of the CG.



The little Pitts looks great, but making great in the air will be the true test of its worth. The semi profile fuselage has just enough shape to be appealing.





I am currently testing a 1500 Kv 24g motor with 10A esc. Had this setup in my FireFly turning a 9x5 prop on 3s. Finding just the right prop combination will be key to the best blend of thrust and speed.





Pushrods were all made from .032" music wire. the arms of the 5g servos just protrude from the fuselage enough to attach and allow full movement.





I had to turn the lower wing ailerons over by swapping them end for end, to get the torque rods to function correctly.



The tail wheel was very simple to bend and install without any additional reinforcement. Will glue it in place once the painting is done.
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Last edited by dz1sfb; Oct 06, 2014 at 08:00 AM.
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Old Oct 06, 2014, 08:04 AM
It's never done that before...
Rclover23549's Avatar
Joined Aug 2012
97 Posts
WOW Looks great! I have the eflite pitts and love it, But this looks incredible! I cant wait to see it after paint!
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Old Nov 10, 2014, 10:23 AM
Registered User
United States, IN, Fort Wayne
Joined Sep 2013
51 Posts
Any updates on your further testing? Nice looking plan and wonderful challenge concept.
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Old Nov 10, 2014, 11:26 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,676 Posts
I have to add some right thrust into this one. Otherwise it really wants to roll left. It can be compensated with the rudder but then she is side slipping throughout the flight.

Here is the finished paint job.

Ken
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Old Nov 10, 2014, 12:53 PM
skumgummi dave
Gresham, OR.
Joined Mar 2004
1,914 Posts
Good looking Pitts!!!
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Old Nov 11, 2014, 04:10 AM
serial scratchbuilder
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Canada, BC, Mission
Joined Sep 2012
1,368 Posts
Very nice! Is that built from MPF?
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Old Nov 11, 2014, 06:14 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,676 Posts
Quote:
Originally Posted by Granted View Post
Very nice! Is that built from MPF?
Yes, entirely from MPF.

Ken
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