Re: Query about high-performance design
- From: "dave.harper" <dave.harper@xxxxxxxxx>
- Date: 3 Nov 2005 06:23:47 -0800
Kevin OClassen wrote:
> I'm in the very beginning of planning a high performance rocket, based on an
> H650 or I700 motor system, and am quite concerned about airframe failure.
> I'm wondering at what point people start reinforcing airframes, and the
> benefits of different materials. From what I've read, anything approaching
> mach needs to be reinforced with fiberglass, at a minimum. What about
> effective gravity? I mean, at what point does reinforcement become
> "mandatory"? 35 Gee? 50 Gee?
>
> My first estimates suggest that this rocket will pull about 40G, but if I
> shrink the rocket a bit (a distinct possibility, chasing mach....) it could
> easily hit 65G+.
>
> I can see several different solutions. Obviously, buy fiberglass airframe
> tubing, and work from that. Are there different types of tubing? Any dealer
> recommendations? Any specific problems working with the product for a 3FNC
> thru-the wall rocket? I've worked with G10 finstock quite a bit, and suspect
> the material would be similar. (fins would likely be 3/32" G10, FWIW)
>
> Reinforcement of phenolic tubing is also in mind. I've looked at
> Aerosleeves, and like the look of the product. I'm particularly thiking in
> terms of carbon fibre, but wonder if that is overkill? Also, I read that
> fiberglass creates a product somewhat more flexible that CF. Does this
> matter?
>
> Because I like to putter and have people willing to teach me the process,
> I'm leaning towards reinforcing an existing phenolic tube, so I'll ask-- any
> airframe tube preferred for this purpose? I've used mostly flexible phenolic
> from Red Arrow, so my exposure to other brands is limited.
>
> Any "DON'T do this" comments?
>
> I'm still scanning the web, looking at what other folks have done, but
> figured I'd tap the expertise in here as well.
>
> TIA
>
> Kevin OClassen
That really depends on the mass distribution, dimensions and mechanical
properties of the components, etc. Can you provide a simple schematic
for what is mounted where, and some dimensions?
Dave
.
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