Pitts S-1S (oz5125)

 

Pitts S-1S - plan thumbnail image

About this Plan

Pitts Special S-1S. Radio control scale aerobatic biplane for .60 power.

Quote: "Potent entry for the Sport Biplane should get this excellent program off to a good start. Author believes in backing up his proposals, and does this well with Stand-off Scale version of famed aerobatic ship. Pitts S-1S, by Jerry Nelson.

The Pitts Special biplane is an obvious selection for the Sport Pattern biplane event proposed in the January '74 issue of Model Airplane News. I doubt if any modeler needs an introduction to the Pitts. The model presented here can also qualify for AMA Stand-off Scale competition. Additional details may be required such as flying wires, exhaust stacks, detailed tail wheel assembly, etc. Major deviations from scale are a reduction of fuselage width and height. Length, moments, areas, etc are quite close to scale.

Construction of the aircraft is straightforward for the average builder who has built from magazine plans. General comments are offered to speed construction. The wings should he built first since they are required before the fuselage can be finished.

Wings. The top wing is built in one piece on a flat board. Ailerons are cut out from the structure after the wing is finished. The maple spar/wing attach blocks are pre-drilled with 1/8 dia holes holes as shown on the plans. The brass tubing serves as guide tubes. Later on you will find that the alignment of the top wing onto the cabane strut assembly will be quite easy. Aileron hinges can be of any type. Goldberg RK-2 hinges were used on the original.

Bottom wing is typical of a built-up wing. The #2 rib can be relocated so as to fit the spacing required for the aileron tray. Note that rib #9 is canted outward 2-1/2° so that the wing struts will line up properly into their attach slots. Suggest that the rib be reassembled with the 1/16 plywood doublers and then not glued to the spars at this time to allow some relocation of the rib during final assembly of the wing, strut, and fuselage. The bottom ailerons drive the upper ailerons via a Kwik Link and Solder Link. A 90° nylon bracket by Midwest Products makes an ideal control horn for the aileron drive push-rod. The aileron drive attach points are similar in both wings. The aileron pushrods (lower to upper aileron drive) can be detailed with the addition of flattened 5/32 OD aluminum tubing placed over the threaded rod thus approximating the streamline shape on the full scale Pitts.

Fuselage. Fuselage is initially built on a balsa floor located on the upper aft center line. The initial alignment of the fuselage is greatly simplified with this system. Cut fuselage floor to shape. Draw centerline down its length on both sides. Cut bottom section of bulkheads F5,6,7,8, and draw centerlines. Attach bulkheads matching up centerlines. 1/32 plywood doublers are attached to fuselage sides. 5 minute epoxy works well for attaching the doublers..."

Quote: "Hello Steve, congrats for your webpage, extraordinary work. I have a Pitts S1-A plan that I purchased in 2008 from UncleWillies, I attach it to this message plus a couple of photos of it built [model photo & more pics 005]. Thanks for the great work."

...also Eduardo said quote: - "This is the old Midwest kit as designed by Jerry Nelson. It had a thinner fuselage because he said that if copied exactly it looked funny. Goldberg used the same modification in his Skylanes."

This is an Uncle Willies plan.

Direct submission to Outerzone.

Update 06/05/2016: article pages added, thanks to RFJ.

Supplementary file notes

Article.

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Pitts S-1S - completed model photo

Datafile:

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User comments

Great plan! I build one. Have a look here: http://www.rc-network.de/forum/showthread.php/735197-Bautagebuch-Pitts-S1-in-140-cm-nach-Outerzone-Plan-unter-5-Kilo-6S-Lipo?p=4835554#post4835554>
Peter Rausch - 09/08/2019
I made this based on your Plan [more pics 006-012]. Thank you for this great Pitts.
Peter Rausch - 23/08/2019
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* Credit field

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Scaling

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