Sumo Rocket Kit
The Aerotech answer to High-Power Rocketry.
The only High Power rocket so complete, easy to build and with piston ejection.
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Disponible el: 0000-00-00
|Motor mount||29 mm|
|Recovery||105 cm (42") nylon parachute|
|Launch pad||High Power|
|Recommended Engines||Aerotech Single use G40-4W, G80-4T / Aerotech RMS G64-4W, H128W-S*, H180W-M*. This is just our suggestion. Many other motors can be used. (*An HPR Level 1 certification is required)|
High-Power Rocketry made easy.
With the Sumo, Aerotech wanted to devise a model that was absolutely complete, easy to build and designed specifically to get certified Level-1.
The kit maintains the characteristics of all the other Aerotech kits, therefore has strong plastic fins (same to those of Astrobee D), locked in place by a system that prevents mounting them out of alignment, and an aluminum screw-on motor retainer. The parachute protection system has been replaced by a piston, which in addition to protect the parachute from expulsion gas, ensures an extremely efficient expulsion, as occurs in Public Missiles Ltd kits. The piston is pushed out by the pressure of the gases and this movement pushes in turn the parachute. It is the most effective system, inherited directly from professional systems.
Why this choice? Sumo is a rather short model. In these cases the parachute is very close to the motor front end and it very difficult to protect it adequately from the ejection gases. The piston guarantees an absolute protection because the gases do not even enter into the space where the parachute is housed, and the parachute is pushed out from the fuselage effectively.
Sumo also has another big advantage: it can be launched with smaller engines than High-Power, so you can be free to do all the flight tests that you want. Using a G engine the Sumo can get to respectable altitudes, and you can verify that everything is working well so you will be sure to get the certification when you will do the certification flight.
If we want to get the same result as in the pictures, it will be enough to paint the rocket entirely in red. Self-adhesive decals will do the rest!
Despite the kit includes the usual launch guides for 6 mm rod, it is highly unlikely that you can launch the Sumo by a launch pad with a rod of this diameter. Even with G engines the weight of the rocket will bend the rod at liftoff , and the launch will not be safe. We suggest you two solutions: the first is to replace the launch lugs with others suitable for rods of 8 mm in diameter at least, and 150-180 cm in length. The second solution, the best one, is to replace the launch lugs with rail guides. If you use this model for Level-1 certification or other High-Power flights you will necessarily do it in a club where rail launch pads are available. The same applies to the launch controller: you need a 12-volt controller, so something like Aerotech Interlock or Estes PS II is valid, but if you fly in a club you will be using their controller anyway.
Aerotech kits have a complete set of solutions and construction details that brings them one step beyond all other mid-power kits of the same size. For this reason, and for the great care with which they are made, they appear to cost more than others, but being so complete does not require the purchase of additional parts, and to finish them you need only adhesive and colors.
Opening the box of one of these kits you will immediately notice the quantity and quality of the parts. The tubes are made of strong kraft cardboard, with pre-cut fins slots. The nose cone is tough plastic, with a length to diameter ratio of about 5: 1.
But certainly the most striking particular is the motor mount assembly and the fins. These are made of rigid and molded plastic. You do not need to sand or give them an aerodynamic profile. They fit into two grooved plastic rings that keep them perfectly aligned and blocked at the same time. No more crooked and misaligned fins!
In addition, the motor mount tube has a pencil line traced on it that acts as a reference for mounting.
Even the motor retainer is worthy of note. Initially, these kits were equipped with a steel engine hook, similar to those present in Estes kits but bigger and stronger. Now Aerotech has made a screw-on motor locking system that is included in all their kits.
If you add the cost of such a retainer and a parachute Nomex protection to the price of other kits comparable in size, you easily see that the Aerotech kits are very competitive.
A nylon parachute of appropriate size, a self-adhesive decals sheet of excellent quality, and launch guides for 6 mm rods are included as well.
The shock cord is made of fabric covered elastic. This is perhaps the only detail that we would improve. Although abundant in length, elastic is not the ideal material because it can break in the long run. As it is tied to the motor mount, it will be difficult to replace it. For this reason, we would add some 3 or 6 mm Kevlar tubular, at least until you get beyond the opening of the fuselage, in order to untie the elastic band if it should break, and replace it with a new one.