Simitar (oz10187)


Simitar (oz10187) by Bill Evans 1976 - plan thumbnail

About this Plan

Simitar. Radio control sport model. Flying wing design for .049 power.

Quote: "A Half-A flying wing with quick response and near full-pattern capabilities. Easy to build and repair, the Simitar requires a minimal flying field size and yields about thirty-two flights per quart of fuel. Simitar by Bill Evans.

The Simitar is a product of the '70s energy crisis and the nation's general conservation effort. With the recent problems having to do with shortages of fuels and materials and the resultant high prices, more economical models seem to be a wise choice for many modelers. Small aircraft generally cost about one third as much to build, maintain, and fly, than their much larger counterparts. Therefore, there are some of us who could not enjoy R/C flying if we were unable to realize the advantages of smaller low cost aircraft. The significant features of the Simitar that you will enjoy are:

(1) Easy to build and repair.
(2) Most any .049 will provide ample power,
(3) Response is quick.
(4) Landing gear installation is not required.
(5) Fuel consumption gives about 32 flights per quart at 6 plus minutes per flight.
(6) Flying field size is minimal.
(7) Dead stick landings are a breeze due to the excellent glide characteristics.
(8) Near full pattern capabilities.

The disadvantages that we have noted are:

(1) The small size, combined with high speed, make orientation at distances difficult for inexperienced pilots.
(2) Large radio gear may be a bit cramped.

Several design requirements were kept in mind for the Simitar. Those were:

(1) The wing span must be 48in or less.
(2) Construction must be quick and simple.
(3) Stall speed must be less than 10 mph.
(4) Maximum power .049.
(5) Two channel radio to be employed.
(6) Weight must be 20 ounces or less to minimize damage in the event of impact.

Flying experiences with the Simitar have been most rewarding and pleasurable from the very first. Hand launches are made from a standing position, and no running start is required when using a TD .049 for power. After the first launch of the initial prototype a bit of down elevon trim was applied and it was off in a normal climbing attitude. Inside and outside loops were tight and tracking through the loops was good. The rolls, twenty-five or more, made it seem like the ship was attached to an electric drill! Four point rolls, due to a lack of rudder control, as well as tail slides, are not practical for this ship. Inverted flight and tight turns however were very easy. The most satisfying first flight experience was the dead stick landing, since the glide was excellent, very flat and gentle and, much better than expected..."

Supplementary file notes

Article, thanks to hlsat, JHatton.


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Simitar (oz10187) by Bill Evans 1976 - model pic


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User comments

Dear sirs, I could not find the CG designation both in the plan and articles. This is one of most important thing for the scratch builders. Hope this will help for any improvement. Regards,
Shinjin - 30/04/2021
Good point. Bear with me while I start up my time machine and set the dial for December 1976.
SteveWMD - 30/04/2021
Bill Evans basically designed about 70 or so Simitar derivatives of which around just over 50 have been published. He always used the same airfoil on all of them. Due to the airfoil design, which uses reflex at the trailing edge (both elevons slightly up), the CG is fairly further forward than on conventional airplanes.
I have built the Simitar Deuce (plan #oz4184) which is basically the same one presented here, but slightly larger, has landing gear, and some minor different details. The CG on the Deuce (54" span) is 1-3/8 inch behind leading edge (13" chord). So for this one (50" span , 10" chord, according to article), it should be around 1" to 1-1/16" behind leading edge. If visual confirmation is needed, you can look at the Simitar Deuce plan that I already mentioned.
RC Yeager - 01/05/2021
Yes. Take a look at the other Bill Evans's Simitar Range of models. C of G are all close to leading edge. BTW Thank you for reclaiming these plans from history. From NZ,
Phil Fowler - 01/05/2021
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