Invictus II (oz6563)
About this Plan
Invictus II. Twin boom pusher sport pattern model, for 45 - 61 power.
Quote: "Invictus - it means undefeatable, or if you prefer, unbeatable. That is the way I feel about this design. I am delighted to see the present trend of multi design aircraft finally swinging away from the super-modified TaurusKwikFlyOrionAstrohog and toward more creative ends. During the past year or no many new and fascinating designs have come out; however, I feel that many of them suffer from one of two faults: They are either a bit too difficult to construct, except for the more ambitious builders, or they are really not good stunt pattern aircraft. I believe this design cures these two faults and still remains creative. Let's face it. It is about as different as you can get! And I guarantee you it will stand out on any flight line!
It all started several years ago when a fellow Chicagoland R/C member, Bob Halvorsen, and I were flying pusher deltas around the Windy City skies. I was satisfied with the pusher engine concept, the sleek military nose, and the ease of construction, but let's be honest - you can seldom, if ever, get a delta to spin, snap roll or knife edge. So this present design evolved. I wanted to retain the pusher engine, sleek military nose, and still have a ship that would be truly different, aerodynamically sound, and do the complete AMA and FM pattern as well as a standard multi ship.
After the first test flights, I realized (with knees shaking) that this beauty had exceeded all my expectations. First of all, she is beautiful to behold in flight. With the swept wing and twin booms it looks more like a real jet than anything I have ever seen. Spins, snap rolls and knife edge flight are extremely smooth and easy to perform. The rolls aie axial without a trace of yaw. She is an extremely easy aircraft to fly and is quite fast. Interested? Read on, McDuff!
The stab was placed on top for two reasons. First, because I thought it looked good, but mainly to get it away from the prop blast just sixteen inches away. This does not seem to adversely affect the axial rolls at all. The fin area may look a little large, but it is in keeping with this type of design. At first glance the linkage problem may look like a nightmare, but bear with me. It's quite quick and simple if you use cable inside of teflon or nylon tubing. If you use bellcranks or Nyrods you're on your own.
The choice of engine and tank are up to you. The prototype used a Super Tiger 60 with a German made 11 x 7-3/4 pusher fiberglass prop. Notice I use the past tense. The prototype finally joined an elite group: The German Mid-Air Club. I think I cried for two days.
The Super Tiger 60 is more than adequate as this ship should weigh out no heavier than 5-34 to 6 pounds dry. I'm sure a good .45 would do the job. A standard tank put in backwards has worked well with the Super Tiger, although theoretically, a balloon tank should be better. There is plenty of room inside the fuselage for any radio gear..."
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User commentsBrilliant stable design - required some lead in the nose. Built a second one that carried a full size video camera in the front. Weight distribution was good. Secure attachment of tail plane is a must as first one let go. Built about 30 years ago and still in one piece but a little worse for wear. 60 powered is best, but a 46 worked well.
Col Baker - 30/08/2021
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