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Old 09-05-2013, 04:43 AM
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mycrofte mycrofte is offline
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Default Booster Ignition

I had another idea pop into my head and thought I would ask here.

Small rocket stages are generally connected directly so the booster can ignite the second stage. I was wondering if a hollow, engine size thermocouple could generate enough current to remotely fire an ignitor?

I have never done a two stage rocket and have no idea what the ejection is like on a booster. I am guessing it has to be a mini blow torch to ignite a second engine...
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Old 09-05-2013, 06:20 AM
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Quote:
Originally Posted by mycrofte
I had another idea pop into my head and thought I would ask here.

Small rocket stages are generally connected directly so the booster can ignite the second stage. I was wondering if a hollow, engine size thermocouple could generate enough current to remotely fire an ignitor?

I have never done a two stage rocket and have no idea what the ejection is like on a booster. I am guessing it has to be a mini blow torch to ignite a second engine...
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Not with a single thermocouple. You could conceivably do ti with a bunch of them and an igniter that doesn't need a lot of current but you'd be adding a lot of weight and there are better ways to get the job done.
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Old 09-05-2013, 06:47 AM
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That is what I was wondering. Could you make one compact enough but still provide enough current for ignition? I was thinking of something the same shape as an engine casing with a hollow core. Whatever flame the booster produced could shoot up through it and create a current.

But, it was just a passing thought.
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Old 09-05-2013, 07:41 AM
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Too much weight and not enought time either.
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Old 09-05-2013, 07:52 AM
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Gap-stage.

You can have the motors separated by about 10 or 11 inches. The booster stage is a section of body tube with a coupler and two opposed vent holes at the front.

Works great and it's easy.

Attached is a simple 2-stage rocket I flew in my LUNAR days.
Attached Files
File Type: ork Wolverine Jr.ork (2.4 KB, 28 views)
File Type: rkt Wolverine Jr.rkt (29.4 KB, 25 views)
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Last edited by Ironnerd : 09-05-2013 at 08:07 AM. Reason: Added ORK/RKT file
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