RW-22 Tiger Moth Top Wings:
The shape of the trailing edge at the root is not like a Tiger Moth.
Fig 9 shows 90 degrees at the root rib to the trailing edge. In the film Roger shows making an indent from the rear spar to the second rib trailing edge. This is like a
.......................Sky Bolt................................................... Tiger Moth ..............
My Redesign: To make the Top Wing like the real Tiger Moth, The root rib is cut off flush with the rear spar. The next two ribs are cut short at the trailing edge to give a curve to the fourth rib that is full length.
Ribs: full length Fig 2. There are two full length ribs in each side, top wing. Six ribs are made with the trailing end cut off 1/8 of an inch longer than the final length. On the two ribs that are shorter, I left off the rear 1/16 plywood that goes from the top rib cap to the bottom rib cap. After these ribs are fitted to the trailing edge I will put the 1/16 plywood back.
The ROOT rib: the front up right 1/4 X 1/4 is cut to 1/8 x 1/4 Fig 4. The rear spar I added a 1/8 plywood plate to the front of the spar at the root block. With this plate I had to move the 1/4 X 1/4 forward 1/8 of an inch. The 1/4 X 1/4 rib up right is left off and the rib is cut flush with the rear spar.
Wing bows are not the right shape.
Fig 9 did not use! In the film Roger said YOU will have to look at a real Tiger Moth to get the right wing bow shape.
Lower Wing Changes
"Oh" time to glue up the next rib, be back in an hour an a half.
On the RW22 the ailerons are full length. I design mine to be like the real Tiger Moth. Of course this means Fig 30, 31, 32, is NOT used.
There is a curve at the trailing edge at the root. The root rib and the next ribs are cut short at the trailing edge to give a curve. The next two ribs and the end ribs are full length Fig 2. Six aileron ribs are made with the trailing end cut off 1/8 of an inch longer than the final length.
The Ribs for the aileron I changed. I removed the rib up right 1/4 X 1/4 at the rear of the rear spar, so I can make the aileron well with a solid piece of wood the full length of the aileron. The purpose is to make the aileron well and the rear spar, (like) one solid piece so when covering, the well does not crush in and cause an unwanted scollop between the ribs.
I will not be using the 1/16 plywood caps over the ribs., because I will be rib lacing. The compression strut 3/4 X 3/4 is a 1/4 inch from the rib..NOT CLUED TO THE SIDE OF THE RIB..
Also, I will add the compression strut 3/4 X 3/4 to the top of the spars to make the wing stronger.
The RW-22 lower wing is not swept back. The change will sweep the lower wing back the same as the top wing. About 6 degrees.