level 1 Question.

[MikeSModerator]

I scratch build most of my rockets. But when I go for my level one I want
to make sure.

I am getting a HI-Tech H45 Loc. W/38mm engine mount.

I hope to use it with a 29mm adaptor to use a 29/240 case and an H180W
load.

I have a EZI-65 built but want to save it for larger motors and W/ a little
more experience.

I ‘believe it or not’ launched the EZI-65 with a G80. It went, but the altitude was just enough for recovery.

As always there is a budget.

I am planning for MHM 2007

Does this sound like a good plan?

thanks Mike

[Chris LaPanse]

Sounds like a plan, although I vastly prefer the 38mm H123 to the H180. The longer burn is nice, and the wider and shorter case is easier to clean. Either one will be nice. Will you be at the November launch this saturday?

[MikeSModerator]

I work weekends. 4 10s…friday through monday

[new2hprParticipant]

All,

I too am thinking L1 now. Any opinions on the LOC Fantom 438 EXL? It’s got a 38mm mount (which I’ll augment with 6x24mm cluster for later 😀 ).

I think it should be nice and big and low with a small H, but capable for much more interesting (Dual deploy, etc.) for later. Should I swap G10 for the ply fins if this will also go L2?

Opinions are welcome and requested!
-Ken

[Chris LaPanse]

That should be a good choice. G10 fins might be a good idea, although wood would work.

[new2hprParticipant]

The Hot Pink Suppository of Discomfort had G10 fins. I LOVE working with that stuff. I don’t know if .062″ thick would be adequate on the larger span of the Fantom 438, though. I still have a couple sheets of .062″ left. Suggestions from Mr. Composite (Chris)?

I’d love the look of CF over the stock plywood fins (glossy clear, but unpainted, of course), but I doubt it’s worth the trouble.

-Ken

[Ken PlattnerParticipant]

Pay attention to the weight on the aft end. It can dramatically alter the CG/CP ratios. Adding FG may aft may need counter balancing towards the nose.

KenP.

[Chris LaPanse]

I could make some (pure) CF plate up for you if you wanted – it’s pretty easy, and the cost would run about ~$20-$25 for enough roughly .062″ thick plate for that rocket (more than adequate for almost anything L1). It would have that glossy look that you like (possibly with slight pinholes, but not many). I could also make it to any thickness you wanted (in increments of roughly .08″). Obviously, the thicker stuff takes more cloth and would be more expensive. If you don’t want it, I’d recommend G10. I’ve flown .062 G10 fins to 600+mph before without difficulty, but there was DEFINITELY flutter. YMMV. .093″ would take anything you throw at it without difficulty (IMO, anything thicker than that would be a waste unless you want to do mach with it).

Chris (who somehow apparently got dubbed “Mr Composite”)

[Ken PlattnerParticipant]

Well, Mr. Composite is probably a better label than Mr. teflon!

[Chris LaPanse]

True 😆

As for weight, after looking at the design of that rocket, you’d probably be fine as is – no noseweight needed (especially with the CF).

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