[BProckets] Tubelesses - update

[flint hapirat]

Hi all,
As promised - more on the tubelesses.
I had a launch a few days ago and here are the
results:
Tubelesses were prepared in triplets, ~3gr each, 10mm
OD, 3cm long, 2cm long core, 2mm OD.
Grains were rammed and sun dried for a couple of hours
before flight. Storage time was tested previously and
found to be insegnificant (these grains were 2 months
old at flight)
The current test included:
5% tap water - hard to extract, weak flight
10% tap water - easy extraction, good flight
15% tap water - easy extraction, good flight
10% DDW - good flight
5% flour, 20% water - very weak flight. 
5% flour, 15% water - hard to extract the grains, weak
flight.
50% NC laqour (1ppb/100ml acetone) -
one rocket had an AMAZING flight (very powerful,
fast), one exploded and one didn't leave the ground.
Hence, there is lot's of work to be done on the NC
which hints that it might be a far superior binder.

Current launch summary: 
Water (10%+, either tap water or DDW) gives good
results.

The same goes for some additives [all these were
tested the last time]: 
5% dextrine 
5% corn starch
5% potato starch 
All supplemented with 10% distilled water.
All these give a fairly rigid, cracks free, smooth
looking grain. 

A few notes:
In all the successfull tubelesses compositions the
flight is usually much slower compared to a nozzled
core burner of similar proportions, and the apogee is
between 20-30m (eye estimation). This is surprisingly
nice
 a fairly good result.

I plan on testing various NC laqour concentration and
types. What I can get is: ping-pong ball (99% NC
according to manufacturer), Sanding sealer laqour
(also NC) and very little smokeless. I'll try all
these and report.

Well... 
That's it for now.
Comments/questions?
Cheers,
Flint


		
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