Supersonic Flight and Sonic Booms

Discussions on high/extreme altitude and mach busting rockets.

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SpaceManMat
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Re: Supersonic Flight and Sonic Booms

Postby SpaceManMat » Thu May 05, 2016 5:46 pm

Yikes, Mach 3 in the stasophere is about 370C.

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jase
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Re: Supersonic Flight and Sonic Booms

Postby jase » Thu May 05, 2016 6:21 pm

OTT - modified kettle, 'lets get this coffee brewed quicker, first class are waiting!'

Mat - yup, reason why flights between Mach 2 and Mach 3 are 'exponential' more difficult?

Posted these today as a place holder (for me) and as an interesting point (for others)...

Without going into detail, I ran a sim today on a previous flight Noel and I did but with a different motor (M650 sub-minimum diameter to 30k feet), with new motor sim said Mach 4.49 so I needed to do some 'goggling', remembered this thread, tried some single malt(s)(maybe plural), and posted what I found...(note to self - it'll need a 'sanity check' before even considering to attempt it)...

The Concorde image I thought was very cool, and relevant for us :!:
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SpaceManMat
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Re: Supersonic Flight and Sonic Booms

Postby SpaceManMat » Thu May 05, 2016 7:01 pm

Some of the guys on TRF had discussions about N5800 and Mach 4+ flights that failed of course. Not sure thats survivable without large amounts of metal, wonder what Nic thinks the limit of his leading edge construction technique is?

Mach 4.5 on the graph is about 870C. What's the plan?

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jase
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Re: Supersonic Flight and Sonic Booms

Postby jase » Thu May 05, 2016 9:09 pm

I can hold a Bic lighter against your arm at nearly 2,000C for a moment :wink: and you can survive :shock:

imagine Nic's ingenious design at half the thickness (fins) and half the weight...

Defence materiel :lol: 8)
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Lister
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Re: Supersonic Flight and Sonic Booms

Postby Lister » Thu May 05, 2016 10:03 pm

When did you get more unobtanium.. You been holding out on me?

I'm bringing a hard hat to that launch :shock:

High Impulse
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Re: Supersonic Flight and Sonic Booms

Postby High Impulse » Thu May 05, 2016 10:34 pm

I know somewhere with an abundant supply of Ti6Al4V which would probably do the job...

Although the DMTC probably wouldn't be very impressed if it were strapped to an N5800 :(
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vance2loud
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Re: Supersonic Flight and Sonic Booms

Postby vance2loud » Fri May 06, 2016 1:55 am

TRA #15165 AMRS #50
I do it because i can, I can because I want to, I want to because you said I couldn't. - Unknown
I have not failed. I've just found 10,000 ways that won't work.
- Thomas Alva Edison

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kopius
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Re: Supersonic Flight and Sonic Booms

Postby kopius » Fri May 06, 2016 6:57 am

QRS Secretary

AMRS #3 L3 ACO
Life member of QRS

NAR L2 #98260

MDRA Member #0241

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Scoop1261
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Re: Supersonic Flight and Sonic Booms

Postby Scoop1261 » Fri May 06, 2016 8:21 am

Why Limit Yourself?

AMRS #4 - L3 |TRA #11080 - L3 |MDRA #263

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SpaceManMat
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Re: Supersonic Flight and Sonic Booms

Postby SpaceManMat » Fri May 06, 2016 12:43 pm

Sometimes I think we put far too much emphasis and trial and error as the primary learning tool. It should not be that way IMO, what we are doing is known so we should be doing our homework upfront. Ok I know that I'm probably biased as it suits my build style to do things that way, but if your going to chuck a thousand dollars or more at a bird you should at least do your best to avoid as many of the obvious pitfalls as you can.

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OverTheTop
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Re: Supersonic Flight and Sonic Booms

Postby OverTheTop » Fri May 06, 2016 1:00 pm

TRA #13430
L3
"Everybody's simulation model is guilty until proven innocent" (Thomas H. Lawrence 1994)

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SpaceManMat
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Re: Supersonic Flight and Sonic Booms

Postby SpaceManMat » Fri May 06, 2016 1:23 pm


High Impulse
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Re: Supersonic Flight and Sonic Booms

Postby High Impulse » Fri May 06, 2016 5:51 pm

L1: Callisto - H410VM

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jase
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Re: Supersonic Flight and Sonic Booms

Postby jase » Fri May 06, 2016 7:57 pm

Sheesh! I just wanted to talk about rockets....

I reckon 6061 T6 would do the job - BTW, I don't beleive my drunken sim at all, not even a little bit.

Mach 3 ish I think is doable with a 75mm motor of sufficient savagery.

I'm also entertaining a sub min diameter 6" project - not outside the realms of possibility...

Yeah, it's all piss-and-wind until you step up and do it.

Ti sure, why not! Although I'm not sure any high performance sounding rockets ever utilized it for entire fin? Well, leading edges of this bad boy http://www.isas.jaxa.jp/e/enterp/rocket ... s520.shtml
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