The development of the U/C Valve
The inside scoop from the guys who thought of it!
1. Arrangement for an L Class Hybrid Motor
SPECIFICATIONS:
800 lb-sec total impulse at 150 sec and 350 psi.
Oxidizer Tank:
| Dimensions |
Weight |
Volume |
Wall Thickness |
| 5-3/8 in OD x 17 in L |
9-1/2 lbs with valve |
220 cubic inches. Will take 5 lbs of N2O. |
.13 in |
Fuel grain - 22 cubic inches:
| Grain ID |
Burn Time |
Surface Area |
Length |
G |
Nozzle |
Orifice |
| 2 in |
5 secs |
345 sq in |
55 |
.318 |
.456 in |
.131 in |
| 2" |
10 secs |
173 sq in |
27-1/2" |
.159 |
.322 in |
.093 in |
| 3 in |
5 secs |
-- |
36 in |
.138 |
.456 in |
.131 in |
| 3 in |
10 secs |
-- |
18" |
.069 (too low) |
.322 in |
.093 in |
CONCLUSION:
Use 2" grain with 10 second burn or 3" grain with 5 second burn.
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