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  #21  
Old 03-03-2020, 09:06 AM
BigRIJoe BigRIJoe is offline
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When folding a streamer, make the width of the folds less than the width of the body tube
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  #22  
Old 03-03-2020, 01:31 PM
olDave olDave is offline
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Default for fun, or for competition?

Quote:
Originally Posted by Earl
The oft quoted rule of thumb is 10 to 1......


IIRC, that was the limit set for NAR streamer duration events. Wider being better, the 10:1 thing was to prevent someone flying a streamer shorter and wider. This kinda forced people to stay within reasonable bounds and "evened up" the playing field.

For plain ol' sport flying, make your streamers any size or shape you want. Longer has definite advantages if you are launching over bush or tall grass, as a looong streamer will often drape over the tops of surrounding foliage and be much easier to see.
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  #23  
Old 03-03-2020, 01:35 PM
olDave olDave is offline
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Default as to BT-60

If your streamer is big enough to upset the stability of the rocket in descent mode, even a BT-60 will generally land just fine. If you can make it work out so the rocket falls on its side, all you need to do is build strong fins (that is, choose smart shapes, use appropriate thickness and material, etc).

You can often get away with NO streamer----just tether the separated nose cone to the rocket and it will tumble down. Called "nose-blow" recovery, this is an old system that everyone nowadays seems afraid to use.
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  #24  
Old 03-03-2020, 02:38 PM
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tbzep tbzep is offline
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Quote:
Originally Posted by jeffyjeep
Personally, I don't think I would use a streamer in ANYTHING that's BT60 based. What does the model weigh?

I've gone as big as the BT55 Vigilante sustainer with crepe paper streamer. I always launched it in a pasture, so it had fairly soft landings. I don't think I'd do it if the model was bigger and/or I was recovering on hard ground with little vegitation and sure wouldn't on pavement.
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  #25  
Old 03-03-2020, 04:07 PM
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jeffyjeep jeffyjeep is offline
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EVERYTHING I launch somehow finds pavement, water, or a tree.

If I launched a rocket in the Sahara, it would find pavement, water, or a tree.

If I launched a rocket on the moon, it would find pavement, water, or a tree.

If I launched a rocket on an A8-3 from the geographic center of a 1000 acre sod farm, it would find pavement, water, or a tree.

Etc.
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  #26  
Old 03-03-2020, 10:52 PM
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bernomatic bernomatic is offline
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Quote:
Originally Posted by olDave
If your streamer is big enough to upset the stability of the rocket in descent mode, even a BT-60 will generally land just fine. If you can make it work out so the rocket falls on its side, all you need to do is build strong fins (that is, choose smart shapes, use appropriate thickness and material, etc).

You can often get away with NO streamer----just tether the separated nose cone to the rocket and it will tumble down. Called "nose-blow" recovery, this is an old system that everyone nowadays seems afraid to use.


IIRC Wiley Ley in his book Rockets, Missiles and men in space claimed there were rockets launched at White Sands after WW2 which used the nose blow method of recovery.
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