2.2" Fiberglass Tomach ™
As far as you can go with an L2 kit
Posted by Don Kephart on 13th Mar 2020
I flew this to 18,500' at Black Rock on an Aerotech L1000. I wanted to use it as a test bed for my tracking and telemetry before my L3 certification attempt. I was a little nervous about putting almost 300 pounds peak thrust into a thin-wall fiberglass airframe so I called the folks at Mad Cow. They assured me that others had flown the Tomach 2.2 as a minimum-diameter project before with no problems.
A few things you should know about this kit:
1) Like other Mad Cow kits, the CNC machining and tolerances are A+. Everything is true and snug.
2) You may need to replace the forward payload bay with a longer section of airframe tubing to have sufficient volume for your parachute, deployment bag and recovery harness.
3) You will almost certainly wish to add fin root fillets and tip-to-tip fiberglass reinforcement for the fins themselves. You will probably also bevel the fins to reduce drag.
4) The fins are relatively small and not all the way aft on the airframe, so the center of pressure may be farther forward than you are used to with other rockets. Depending upon your motor you may need to put some extra weight into the nosecone to maintain stability.
A nice performer
Posted by NZ Rocketeer on 24th May 2017
I modified this kit a bit to get a more conventional dual deploy system and I did tip to tip glassing of the fins to make sure they never came off. A lovely flyer. I have not tried to make it aerodynamic, but it made 4,600 feet and Mach 1.05 on a J425R. No damage and I am getting it ready to fly on a K or an L.
Nice minimum 54
Posted by John Jamieson on 17th Nov 2016
Had good flights on H's and I's, on a J it needs a tracker. I unfortunately lost it.
Little Ripper of a Rocket!
Posted by Stewart on 4th May 2016
I constructed one of these about 18 months back, painted it orange, and called it "Orange Revolution". Set up as dual deploy (2 x Ravens) with telemetry (TeleMega). Had a great flight at Thunda Downunder 2015. First flight was on a CTI L640DT. Figures from it were:
Altitude: 21512', Max Velocity: Mach 1.8, Max Accel: 47G
Flew it last year for its second flight but someone pushed the button before I had the GSE booted for tracking. It is temporarily lost, so I need to buy another one.
2.2" Fiberglass 5:1 Von Karman Filament Wound Nosecone
2.2" Filament Wound Fiberglass Airframe 30"
2.2" Filament Wound Fiberglass Airframe 18"
2.2" Filament Wound Fiberglass Coupler 6"
G10 1/8" Fiberglass Fins
G10 Fiberglass Bulk Plates (2 Airframe, 2 Coupler)
Nylon Shock Cord
Cardboard Fin Guides
Hardware Pack (10-24 Eyebolt (3), 10-24 Nut (3), #10 Washer (3), 8-32x7 Threaded Rod (2), 8-32 Nut (6), #8 Washer (6), Rivet (2), Rail Buttons and screws (2))
Weight: 2.5 lbs
Motor Mount: 54mm
Fins: 3 each 1/8" G10