When in doubt, stuff a Huge Motor in it. Never had an issue, just a walk.
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On Tuesday, April 23, 2019, 7:51 PM, James Dougherty <jafrado@xxxxxxxxx> wrote:
When we don't have a thrust curve we usually go by average thrust, and divide
the vehicle weight.Yes, crude, but you need to think fast as RSO/LCO and that's
something you can see guys like Bruce or Marino do blazingly fast;it becomes
second nature.
So being able to divide by and do this as first line of defense is always
preferred to sim results. Usually for sim resultswe want to meet before we head
up to the RSO table.
problem with sims is GIGO, is everything correct? Weights? Lengths, finish
first calcs, then look at sim.
We need to get back to doing basic math, we landed on the moon with less
compute now available in free calculators!
My email was not to dog Eric, he has a great loud voice like Marino, he'd make
a good RSO, and he's already proven his mettle as a spotter!I think he's L2 ...
will wait for his reply.
Now don't everyone volunteer to be RSO at once :-)
On Tue, Apr 23, 2019 at 6:22 PM Vito Orlandella <ravenfireflyer@xxxxxxxxxx>
wrote:
Eric
You are so right on this
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On Apr 23, 2019, at 6:03 PM, Vito Orlandella <ravenfireflyer@xxxxxxxxxx>
wrote:
Nice theories and sims.
I always like the person with the ability to launch one at the slowest off
the pad.
That’s where the real talent is. To be able to see one rise slowly and
stable.
Anyone can blast one with enormous amount of speed off the rail. But just who
can launch a slow off the pad in a realistic representation of our
Saturn/moon celebration for Dairy Air Theme?
I’ve got a $100.00 Award at Dairy Air for those that look beyond the easy so
called minim W/T on the sims.
Vito
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On Apr 23, 2019, at 2:53 PM, Eric Renger <ericrenger@xxxxxxxxxxx> wrote:
That’s true that just looking at the peak thrust during the first second is
not the only thing to consider — it depends on the length of the rail and
whether the thrust you are using for your ratio comes while the rocket is
still on the rail with plenty of room to speed up.
But really these rule of thumb guidelines are all shortcuts to getting
adequate speed off the rail. I don’t think it’s a good idea to rely only on
the thrust ratio, especially if it is close. I think you should always do a
better quality sim that uses an accurate thrust curve for the motor, an
accurate rocket design file with measured CG and measured rocket mass, and
the correct rail length for the equipment you will be using. The rule of
thumb thrust ratios are great for pre-screening the motor choices and
narrowing things down, but you should always plug your motors into a decent
sim program to be sure.
Eric
On Apr 22, 2019, at 4:48 PM, <steven@xxxxxxxxxxx> <steven@xxxxxxxxxxx>
wrote:
Hi Dale,
