Sunday, January 21, 2007

48" long wound FTC test

I tested the 48" wound florescent tube cover tank to failure this morning. At around 1500 PSI it started weeping around the o-ring. At between 1900 and 2000 PSI the pins on the aluminum end cap failed. All the pins were sheared off, and none of the spectra was even torn. I'll post detailed pictures later.
(The tank was 337 gms and held 1.65 Liters of water. for a MR >5 at 1500 PSI)


George Katz said...


I am very impressed with what you managed to do with the FTC tank.

The water rockets community would be very interested in these tanks for high performance water rockets. I took the liberty of putting your tank parameters into Clifford Heath's simulator to see what sort of performance is achieavable, and by the looks of it, with a small nosecone, a set of fins, and the tank fitted with say a 10mm nozzle, you could probably break the world water rocket altitude record with it.

Look forward to seeing the photos. Keep up the good work.

- George
Air Command Water Rockets

Paul Breed said...

I think the water rocket rules forbid the use of metal parts. I'm using aluminum end-caps so I'm not sure
its appropriate.

George Katz said...

Hello Paul,

There are no 'official' rules for water rockets as we are generally a loosely connected bunch of enthusiasts. There are often competitions set up that impose certain rules such as capacity, materials used, etc. But the rules are as varied as the competitions.

The 'no metal parts' is often stated for safety reasons, but in the same way a high performance water rocket is dangerous in its own right, metal parts or not.

But generally the more sophisticated rockets do end up using metal parts to an extent be it in their deployment systems, cameras, nozzles or otherwise.

I think the serious water rocketeers will be looking closely at your developments.

I don't want to distract you too much though from your mission.


- George