Tutor Too Classic (oz11442)
About this Plan
Tutor Too Classic. Control line stunt model. For Super Tigre .40 power.
This is a later modified version of the Top Flite Tutor (oz11400) design.
Quote: "Steve / Mary, I found a small sketch of Dave Hemstrought's plane, TUTOR TOO CLASSIC online. No plan existed for it that I could find, so I decided to take the Topflite Tutor from which the plane is derived, and make the appropriate changes to the Tutor's outline. The new plan corresponds with the sketch drawn by Jim Harris featured in an article in the MAN magazine from the 1980s. (if anyone has the article please upload it- or a picture for that matter!)
Dave Hemstrought's plane, the Tutor Too Classic, had a 47-3/4 in equal span wing, and used a Super Tigre .40. The builder needs to make certain that the engine mounting size is right for the .40 used as well as an appropriate sized tank. (This plan shows the original Topflite Tutor .35 size engine spacing, and 4 oz. tank. Adjust as necessary).
There are two changes that I made for the plan. First, I included an adjustable leadout guide. The sketch calls for fixed positions. Secondly, I left out the fuselage cutout from the plans. If you want to reduce weight further by doing so, then by all means either follow the sketch or drill several 1 inch holes. Thanks, George Albo"
Direct submission to Outerzone.
Update 12/04/2021: Added article from Model Aircraft by Dave Hemstrought, detailing his modifications to create the Tutor Too from the Top Flite Tutor kit, thanks to GeoffGoodworth.
Quote: "How to Make a Precision Aerobatic Airplane Work, by Dave Hemstrought.
The purpose of the words you are about to read is to share with you the experiences I have been through as a builder and flier of Precision Aerobatic airplanes, to help steer you in the right direction, and to help eliminate common mistakes that virtually all Stunt fliers have made at one time or another. What causes the problems is our inclination to experiment and try something different. This is okay if you have some facts to back you up. More times than not a flier ends up with a $100 or $200 investment hanging on the wall!
So, I am going to give you some facts. Of course, when this is all said and done, you may want to redesign the rudder shape, wing tips, canopy, landing gear, wheel pants (be sure they are round or oval shaped), or the paint scheme. All this is fine as long as you don’t fiddle around with the other stuff. In fact, throughout I am going to be very dictatorial, simply because it works for me. And if it works for me, it can work for you!
Our subject will be the Top Flite Tutor. It is a well-designed kit. It features good wood and easy-to-follow plans, and easy to follow plans, and is easy to build. Mark Bauer did a good job of designing it and Sid Axelrod of Top Flite did his usual excellent engineering job.
Let’s get on with it. I am going to assume you know how to build a model airplane, therefore the building sequence should come from the plans. I will discuss only the changes necessary for good aerobatics.
Moment Arms: For our purposes we will say these are the distance from the back of the prop to the leading edge of the wing at the root (nose moment arm), and the distance from the flat/wing hinge seam to the stabilizer/elevator hinge seam (tail moment arm) .There are other ways to figure this, but this is the way we are going to do it.
We want the nose moment arm to be 62.5% of the tail moment arm. Or, an 8-3/8 in nose moment arm and a 13-1/2 in tail moment arm. The stock 'moments' of the Tutor are 8-1/4 in nose and 15 in tail, but this is too long for the small stabilizer/elevator and narrow flaps. Also, the airplane is very tail-heavy with this arrangement and requires too much nose-weight to balance on its required center of gravity, which also raises the overall weight of the airplane..."
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