Future L3’s

[Dr_J]

Hmmm. That is funny. 🙂 Let me talk to Tim.

Now Doctor J, we should discuss. What I really want is an N1100. I bought (and still have) an M795 for my L3 cert, but ended up flying an AT load because I wanted to keep the altitude down. What kind of deal can we make on an N1100? 😀 😯

Warren

[Chris LaPanse]

Hmm…

I may take one of those M3400s – will it be offered with a similar deal when it shows up later in the month?

[Dr_J]

Hmm…
I may take one of those M3400s – will it be offered with a similar deal when it shows up later in the month?

Eh, .. Why not. I thought this would the the kind of motor for you, Chris.

This deal is starting to become really popular. Good thing the end of the month is approaching fast.

Jeroen

[Chris LaPanse]

Excellent 🙂

With the 98-4g and a couple of spacers, I’ll have a ton of choice when it comes to 98mm loads for my L3 rocket (which I’m finishing up the design on right now). It should be a good case to have. Have you got a thrust curve for that motor so I could sim it?

[Dr_J]

Have you got a thrust curve for that motor so I could sim it?

See your inbox (email).

Jeroen

[sserell]

Sweet deal! Thanks! I’m starting the design process on my L3 now – its based on a Mongoose 98 minimum diameter and would prefer to fly it on the M3400 over the M2505 if possible… could you send me the thrust curve as well?
I’m also planning on flying it on the P98 6GXL but am not wanting to break the waiver on my cert flight so it’ll likely follow.

Thanks, Sean S

[Chris LaPanse]

A mongoose 98 on an M3400?

That should be awesome – my current design will go quite high (5″ fairly light, simming to ~18k on the 3400), but a MD 4 inch should be spectacular. When do you plan to fly it?

[John A. WilkeParticipant]

That’s gotta be a Black Rock shot, right Sean? I’m planning to go to one of the BR launches myself next year, though BALLS may be tough due to so many other diversions that time of year (Oktoberfest, hunting, etc.)

I wonder if a perfectly tuned 4″ minimum diameter rocket can beat a perfectly tuned 3″ diameter rocket for net altitude? I don’t think so… I think an N1100 would easily be the motor of choice on the 98mm side. The 75mm KBA M1450 would give it a run for the money. The Pro75 Dual Thrust motor for that casing would probably tack another 5-8K onto things – possibly more.

I never really thought of this until Dr. J talked about it, but I really believe the highest, single-staged rocket you could build today would fly on a 75mm casing in a min-dia rocket…

[Chris LaPanse]

I doubt it. What about a 4″ MD on a Pro98-6xl 75% or greater N motor?

I would guess that a 3″ would be the best for an M, but the extra impulse of the N should more than make up for the additional drag. It’s definitely an interesting question though.

[Dr_J]

Chris, I think you are right. Excluding the 6GXL (which I forgot), I don’t think the Pro98-6G or RMS98/15360 hold enough propellant given the frontal area of the 4″ motor. The 6GXL might work. What we really need is a 6GXL moonburner….

Just some numbers for the 98-6G casing
N1100 altitude record ~ 45 kft
N3180 altitude record ~ 40 kft

The M1450 in AMW75/7600 casing is capable of 40kft.+. A dual-thrust motor for that casing and some higher density propellant should be 5kft more, at least, as suggested by John. I’m working on a Pro75-like commercial program right now. Within that program, we developed a mold for a larger nozzle. Such a nozzle would really work well with this motor.

An N4100 (98-6GXL) sims to 60kft. I think the N2900 (the Classic load) might result in a few more kft.

Jeroen

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