> As I was putting the motor mount into a Estes Maniac the glue seized too soon.
> As a result, the motor is now going to be 5/8 inch further back (aft) than it
> should be. Will this affect stability? If I have to add some weight to the
> nose, how much should I add? I'm guessing that this will not make any
> difference but this is my first D powered rocket pre or post BAR and I don't
> want to lawn dart it in front of 20 other people at the club launch next month.
You shouldn't find any problem with that amount of difference in the
motor mount location. The Maniac, like many other Estes kits, has a
good bit of excess stability.
It might be advisable to run a VCP or other CP calculation and balance
the rocket in launch configuration before attempting to fly it on an RMS
24/40, though; that motor (especially with E and F loads) is a little
heavier than an Estes D12. Even that, though, is probably okay.
> BTW, Estes calls this thing level three. What a joke. The only reason they
> call this thing level three is the sparsity of the instructions and the
> attention to a couple of details to make sure it survives D & E thrust levels.
> Big Bertha (Level I) was harder to put together becasue of the fin gluing but
> it had very detailed instructions. On the plus side I had 75% of the Maniac
> done in 30 minutes or less (didn't time myself). With my schedule that's about
> all I can spare in an evening to build.
If you look over the Estes catalog with an eye toward skill levels,
you'll note that any model that uses D motors, no matter how trivial to
build (like the Maniac, as the extreme case) is Skill Level 3 or
higher. They've done that just to put off complete novices who don't
know how to get a motor mount glued in place so it stays, I think;
there's certainly (as you point out) less work in building a Maniac well
than there is in building either a Big Bertha (skill 2) or an Alpha
(also skill 2).
Of course, what they don't tell you is that any competent *** (the
sort who don't cut themselves trying to pick up a single-edge razor
blade) ought to be able to start with Skill 2 and make any skill 3 or
skill 4 kit in the catalog as a second rocket -- assuming they're paying
attention and don't get in a rush.
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Donald Qualls, aka The Silent Observer NAR # 70141-SR Insured
Rocket Pages http://www.FoundCollection.com/
Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.