RM576 MkII PDF files

[Pat Johnston]

Since there is a growing interest in the Ringmaster 576, I'm posting the PDF files for the MkII version.  The big differences is in the removable landing gear and removable tail wheel, plus the most recent construction techniques for the fuselage.  These make the kitting and building of the 576 easier.  The wing shows the "Sport" version which does not have flaps, but a flapped version can be adapted easily.  Actually, there are three wing styles available.  The first resembles an S-1 Ringmaster visually.  The second is a D-tube.  And the third has ribs, half ribs and a spar at the high point with a 1/2" square leading edge.  All can be made in the sport version or flapped version.  Tough to keep track of all that.
Anyway, enjoy the gandering.
Pat Johnston
Skunk Works

[Pat Johnston]

I forgot to say that the PDF files are full sized so feel free to make copies if you wish.  See your local print shop.  And please do not turn this into a commercial operation.
Pat

[Dan McEntee]

  I got one of the early kits, I guess, from my son Sean as a birthday or Father's Day gift several years ago. It shows the wing with flaps on one side and no flaps on the other. It's near the top of the build pile!
   I'll print off these plans and put them with it.
  Thanks a lot,
   Dan McEntee

[wwwarbird]

 Is this the same version and airfoil that Joe Gilbert is flying?

[Keith Miller]

Pat - thanks for sharing!
Might you have a full size drawing of the -2 (wing) sheet? The posted version appears to be a reduced copy.

[Bob Reeves]

Is this the same version and airfoil that Joe Gilbert is flying?

No, the wing in the PDF file does not have flaps.

Having been involved with the building two of the original 576 with flaps. The wing that is in Gilberts 576. That wing is not easy to build and making the flaps will tax your frustration level. Mainly because the trailing edge including the flaps is double tapered. Not only does it taper front to back it also tapers root to tip. You cannot build it on a flat board without accurate shimming and plan on doing allot of sanding to get the flaps fitted to the wing.

When I made my flaps I used a taper cutting jig on my table saw to first cut the trailing edge taper then cut the root to tip taper. This turned the sanding process for the flaps into a couple licks with a sanding block.

[Pat Johnston]

Right you are, Bob.  I think that the construction of the original 576 was not as easy as it could have been.  I have since then simplified the flap construction and use the jig rod system for easier construction.
And yes, it is the same airfoil as the one Joe used.  That has not changed.
Pat Johnston
Improvements Division
Skunk Works

[Randy Cuberly]

Right you are, Bob.  I think that the construction of the original 576 was not as easy as it could have been.  I have since then simplified the flap construction and use the jig rod system for easier construction.
And yes, it is the same airfoil as the one Joe used.  That has not changed.
Pat Johnston
Improvements Division
Skunk Works

Pat,
Do you have construction plans for the one Joe is flying?

Randy Cuberly

[PerttiMe]

Pat - thanks for sharing!
Might you have a full size drawing of the -2 (wing) sheet? The posted version appears to be a reduced copy.

If my experiment with the wing file is correct, it needs enlarging by about 423.579%

[Perry Rose]

The flaps can be built by sheeting over the flap locations instead of leaving an opening for them and cutting them out afterwords. Just like you would for a foam wing. Much lighter too.

[Pat Johnston]

Randy,
I definitely have the plans for the original.  That is plans #75.  I'll attach a PDF file so you gan look at it.
Pat Johnston
Skunk Works

[Randy Cuberly]

Pat,
Interesting.  I may have to have plans!  I'll contact you.

Thanks,
Randy Cuberly

[Brian Courtice]

Interesting.
I've been looking at the MKI version of the plans, and I see how the flaps are built like the ailerons on a typical R/C aerobatic model or sailplane. It makes me wonder why this is so rarely done.
A typical control line stunter starts with a conventional symmetrical airfoil then the trailing edge is cut off, and flaps are attached to the trailing edge. The airfoil that results, when the flaps are considered, is NOT a NACA 0018, or whatever other airfoil that was started with.
You rarely see ailerons/flaps like that on R/C aerobatic planes, and never on a sailplane. The flying surfaces on those models are part of the airfoil, not an after thought simply hinged onto a blunted trailing edge.

It makes me wonder if this is done just because it's easier and works OK, or if conventional ailerons operating as flaps on a UC model have been found to be less effective.

[Mike Griffin]

I built three of the RM576, all were the sport model without flaps.  They all flew great because of the airfoil. 
I meant to build the flapped model to compare how each flew but never got around to doing it. 

Mike