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How to fly model airplanes >> Tether/Swing Flying Models >> Flying U-Control models as 'Swingers'
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Message started by simpleflyer on Nov 12th, 2015 at 10:01pm

Title: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 12th, 2015 at 10:01pm
After our recent experience with flying a Berkeley Profile Powerhouse as a swinger with a Cox 020 as the nose weight, we returned to the idea of flying reduced size U-control models by swing control.  We have done a few of these before.

The idea is not a new one.  An article about 'wind flying' was published 60 years ago. 
SC_stunt_ATYM_6-55_sm.JPG (58 KB | )
wind-fly_ATYM_6-55_txt.JPG (92 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 12th, 2015 at 10:25pm
We will start by revisiting the profile P-51 designed by Walter Musciano and marketed by Scientific Models.  We had built one of these in our long list of crashed models before finally successfully flying a Guillows Trainer II.

We've posted a more detailed description of the P-51 in reply #5 at:
http://www.stickandtissue.com/cgi-bin/yabb2/YaBB.pl?num=1428715653/6#6
In this post there is a plan of the profile P-51.

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 12th, 2015 at 11:05pm
The profile P-51 plan mentioned in the previous post is edited in MS paint to obtain the image of shapes below.  This is printed to a letter size sheet of cardstock.  The sheet is cut up to make the patterns also pictured below.  These will be used to cut the balsa for the model.
P-51_pattern.JPG (43 KB | )
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Title: Re: Flying U-Control models as 'Swingers'
Post by Sky9pilot on Nov 12th, 2015 at 11:22pm
Al, you going to use another .049 to weight this one as well?  I look forward to this one coming together.
Sky9pilot

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 13th, 2015 at 11:28pm
Thank you, Tom, for your comment.  Although, Musciano shows a 049 as the power for the profile P-51 and I used one on the P-51 that I built years ago.  I will use a modified Cox 020 Pee Wee on this version.  It will have a 14 inch wingspan as opposed to 18 inches on the original kit.  The 020 ought to make a suitable nose weight.

Today, the parts were cut out and marked.  Kinda looks like our old favorite, the Guillow ZIP no-cal kit.
SC-11-13-15a.JPG (42 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 13th, 2015 at 11:33pm
Also attached the vertical tail and right side nose doubler,  and formed the wing dihedral.
SC_11-13-15b.JPG (37 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by Sky9pilot on Nov 14th, 2015 at 12:13am
Can't wait to see this one in the air.  Just something about a Mustang!
Sky9pilot

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 14th, 2015 at 11:30pm
The left side doubler is attached to the fuselage.  A simple engine mounting plate is made by laminating three layers of sheet balsa capturing the wire landing gear struts.  The nose weight will be the visual shell of the 020 PeeWee consisting of the cylinder, glow head and crankcase.  The metal crankshaft is replaced by a strip of 1/8 square bass rounded at one end to pass thru the front end of the engine.
SC_11-14-15a.JPG (54 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 14th, 2015 at 11:43pm
The Cox noseweight and mounting plate temporarily attached to the P-51 nose to get an idea of what it will look like.
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SC_11-14-15c.JPG (54 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by Sky9pilot on Nov 15th, 2015 at 3:06pm
Bringing back memories of the early days...Al
I love it.  Good use of a beat up .049!
Sky9pilot

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 16th, 2015 at 12:54am
Thanks, Tom, glad you like it.  Actually, the nose-weight is a 40% 049, a 020.  A late night session in the 'paint shop' produced the attached result.
SC_11-15-15a.JPG (37 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 16th, 2015 at 1:13am
We are attempting a simple replication in model form of the Mustang in the attached pic.  N2251D was used by Bob Hoover in the 1960s.  It was replaced in 1972 by another Mustang N51RH. 

We attended a Confederate Air Force Air Show in Harlingen, TX in 1976 and had the opportunity to see Bob Hoover fly the Shrike Commander and the P-51.  Both were amazing flights by a man who knew his aircraft and could fly them to the edge of their flight envelope.  One of the experiences that I treasure to this day.   
RH_mustang_one.JPG (27 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by Sky9pilot on Nov 16th, 2015 at 10:33am
I've had the privilege of seeing Mr. Hoover do that routine in both those birds as well.  I'll never forget it.  Especially the Shrike Commander's engine out manuvers and taxie up to the stands at the end, complete momentum management !!!! Awesome display of skill and finesse!
Sky9pilot

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 22nd, 2015 at 6:10pm
Shown here are a few of the final steps of construction of the P-51.  The air-scoop is glued to the fuselage.  A pair of 3/4 in diameter foam wheels are put together.  And some scrap balsa is going to be glued together to form some 3/16 stock for the side bracing of the nose plate.

A close-up picture of the wheel building process shows the wheels are cut from 3/16 black foam from a meat tray from the grocer.  The wheel hubs are punched from card stock and glued to the foam.  The punch is made from a scrap of 3/8 brass tubing attached to a scrap piece of wood and sharpened.

SC_11-20-15a.JPG (51 KB | )
foam_wheeks_11-20-15.JPG (47 KB | )
SC_11-20-15b.JPG (46 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 22nd, 2015 at 6:19pm
A couple of triangular shaped side braces are cut from the 3/16 stock and glued to each side of the fuselage behind the nose plate.  A simple tail-wheel is formed from a couple of 3/8 inch discs of balsa glued to a piece of thin music wire and attached to the fuselage.  A loop of thread is taped to the wing-tip and the Mustang is ready for a test flight.
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SC_11-21-15c.JPG (48 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 22nd, 2015 at 6:25pm
It was a bit windy, but the test flight was OK, although the outer wing droops a lot in flight.  My guess is the craft is bit heavy and could use more dihedral and wing area.
SC_11-21-15d.jpg (16 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by Sky9pilot on Nov 22nd, 2015 at 7:13pm
My guess is the wing depended on the prop wash for additional lift!  But it sounds like you've got a good handle on the solutions!  Great to see her in the air!
Sky9pilot

Title: Re: Flying U-Control models as 'Swingers'
Post by terryman on Nov 22nd, 2015 at 8:11pm
Simpleflyer,

That's a very sharp looking p-51.  Regarding the foam used for wheels, is it a single sheet 3/16" thick or laminated from multiple sheets?  Will you try anything to improve the flying?

Terry

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Nov 24th, 2015 at 10:40pm
Thank you, Tom and Terry for your comments.

Tom, the little P-51 is really heavy for its small wing area.  These little half-A CL models were pretty hefty and relied for fairly strong 049 to keep them flying in a circle at the end of the lines.  Even though we decreased the wood sizes when we reduced the size of the P-51 it still came out pretty heavy.  And these swing models like to fly as gliders so they like ample dihedral.

Terry, the black foam comes from the fresh meat section of the grocery.  Often when Norma buys fresh meat it comes in small black form trays and a lot of the time they are about 3/16 thick, more or less.  About the future of the P-51, first I thought of turning it into a hanger queen for our workbench.  But , curiosity prodded me into trying to get it to fly better.  We removed the nose plate, LG,  and PeeWee ; and shortened the nose a tad;  and put in a Telco Shark for a nose weight.  This lightened the P-51 a bit and also moved the CG back.  Both seemed to improve flight characteristics a bit.  Next, we'll try shortening the nose a bit more and increasing the dihedral.


P-51_11-24-15a.JPG (40 KB | )
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Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Dec 1st, 2015 at 11:45pm
OK, back to the P-51.  Some more dihedral is added to the P-51 and the nose is shortened a bit.  The wing drop is reduced, but it isn't evident in the pic taken from the center of the swing circle.
P-51_11-25-15.JPG (40 KB | )
P-51_11-27-15a.JPG (10 KB | )

Title: Re: Flying U-Control models as 'Swingers'
Post by simpleflyer on Dec 1st, 2015 at 11:50pm
I asked Norma to take some pix from the outside  of the circle.  These cropped and enlarged images of the P-51 are not clear but do show it flying in a more level attitude.
P-51_11-27-15bCr.JPG (12 KB | )
P-51_11-27-15cCr.JPG (11 KB | )
P-51_11-27-15e.JPG (20 KB | )

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