Monday April 21st 15.00PM CEST we are testing a new engine of the HATV type. We call this subtype “Super HATV”, and we invite you to watch the test live here on our website. The livestream will start approximately one hour before the engine fires. If the engine test is sucessful we will attempt to reload and fire it a second time. There will be no commentary available but you will be able to hear our internal radio communication.
This test is the first in a series of minor test planned this summer to investigate the behaviour of hypergolic hydrogen perioxide rocket engines. This engine type can be very useful in the future as control thrusters or main booster for smaller experimeltal rockets.
This particular engine uses 80% hydrogen peroxide as oxidizer and MDF (yes, you did read correctly – ordinary Medium density fiberboard!) as fuel grain.
While you wait please consider sending us a donation to keep our activities going.
Please note that changes in scedule can occur due to weather conditions or technical problems. The live steam will start at 14:00 CEST and any major delays will be announced on the website.
Time to engine ingnition
Below you can find some of the engines specifications:
- Engine type “Super HATV”
- Fuel: Plywood
- Oxidizer: Hydrogen Peroxide
- Ignition type: Hypergolic
- Engine caliber: 220mm
- Engine length: 440mm
- Fuel / Oxidizer start weight: 2.05kg
- Chamber material: Steel
- Nozzle material: Graphite
- Propellant/Total mass ratio: 65%
- Expected nominal thrust: 1450 N
- Expected burn time: 2.5 S
- Expected nominal Pc: 16,5 Bar
The engine is designated “Super” because its Propellant to Total mass (P/Tm) ratio is more than 2 times better than the “Standard HATV” that powered the TDS1 LES engine and the Sapphire rocket.
The standard HATV had a P/Tm ratio of only 35%. The percentage of propellant compared to the engines total mass is important because it’s directly tied to the rockets efficiency. When building a rocket booster you want as much as possible of the total mass to be propellant, because the shell of the booster is only “dead” weight.