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Hello all, I still have got some german Held-1000 rocket engines (C1.3-0), which I'm planning to use as multistage engines. A few weeks ago I used them on a rocket powered glider, this works.
They have no delay time before the ejection charge, so I think they can be used as booster engines for a first stage.
As second stage I have C6-3 engines (I know 3 seconds delay before ejection charge is probably a bit too short for a 2nd stage, but I've got a box full of these engines, so they must have a purpose )
Does anyone have any experience how far I can separate the 1st and 2nd stages, but still make the 2nd stage ignite? Should the top of the booster stage be placed directly against the bottom of the upper stage, or can I leave some room between?
The Held-1000 have a relatively low thrust and long burn time (5.5 seconds!), so it may not be able to get my rocket up to speed very well. Therefore I consider clustering 3 of them in the 1st stage. But then they need to be ignited at exactly the same time at launch.
Can I simply wire them parallel, and use some heavy battery for ignition? Or should I prevent the rocket from being launched so I can make sure all engines are running?
I can imagine that if one engine ignites a tiny moment earlier than the others, it may liftoff the whole stack and cause the others not to ignite at all, resulting in a dangerous launch.
Some interesting links
http://www.apogeerockets.com/education/how_to_multi-stage.asp
http://www.bookcase.com/library/faq/archive/model-rockets/ignition-tips.html
So although there is plenty of information on the internet, I wonder if any of you have some experience with this.
regards,
mcduck
They have no delay time before the ejection charge, so I think they can be used as booster engines for a first stage.
As second stage I have C6-3 engines (I know 3 seconds delay before ejection charge is probably a bit too short for a 2nd stage, but I've got a box full of these engines, so they must have a purpose )
Does anyone have any experience how far I can separate the 1st and 2nd stages, but still make the 2nd stage ignite? Should the top of the booster stage be placed directly against the bottom of the upper stage, or can I leave some room between?
The Held-1000 have a relatively low thrust and long burn time (5.5 seconds!), so it may not be able to get my rocket up to speed very well. Therefore I consider clustering 3 of them in the 1st stage. But then they need to be ignited at exactly the same time at launch.
Can I simply wire them parallel, and use some heavy battery for ignition? Or should I prevent the rocket from being launched so I can make sure all engines are running?
I can imagine that if one engine ignites a tiny moment earlier than the others, it may liftoff the whole stack and cause the others not to ignite at all, resulting in a dangerous launch.
Some interesting links
http://www.apogeerockets.com/education/how_to_multi-stage.asp
http://www.bookcase.com/library/faq/archive/model-rockets/ignition-tips.html
So although there is plenty of information on the internet, I wonder if any of you have some experience with this.
regards,
mcduck