Terrier/Sandhawk conversion

Terrier/Sandhawk conversion

Post by A. Roger Wilfo » Fri, 01 Apr 1994 17:00:00




Quote:
> i just bought an estes Terrier/Sandhawk(thanks Ross!)
> and wondered if anybody had some hints for conversion
> to a REAL 2-stage setup.  the 'coupler' looks like it
> may be possible to adapt, except for the sustainer
> engine positioning.

> additionally, actually _having_ a sustainer will require
> more weight in the nose.  how stable is the sandhawk
> to begin with?

The Estes Sandhawk was a issued as a single stage model about 15 years ago.
That model did not need added nose weight (I have one that flies just fine).

A two stage configuration for the Terrier/Sandhawk shouldn't require any
addition nose weight.

- Roger

 
 
 

Terrier/Sandhawk conversion

Post by R.E. Wiers » Sat, 02 Apr 1994 03:34:34


Quote:

>i just bought an estes Terrier/Sandhawk(thanks Ross!)
>and wondered if anybody had some hints for conversion
>to a REAL 2-stage setup.  the 'coupler' looks like it
>may be possible to adapt, except for the sustainer
>engine positioning.

I've done this, and flew it at the NSL back in February. I'm in the process
of drawing up the plans for Sprocket. What I did was to put an 18mm motor
mount in the Sandhawk, and replaced the "coupler" with an expended Aerotech E
casing. The capacitor and mercury switch used for staging are the adapter.

The only problem I had on the first flight was the chute hung up in the  
Sandhawk. It staged perfectly, and was very stable. However, I modified the
kit a _lot_, so it weighs close to 13 ounces without motors. I used an Aerotech E15-4 in the Terrier, and a B6-6 in the Sandhawk for the first flight.

Quote:
>additionally, actually _having_ a sustainer will require
>more weight in the nose.  how stable is the sandhawk
>to begin with?

Actually, the extra weight of the electronics, plus the weight of the motor
in the Sandhawk require less weight in the nose. Estes supplies 2 packs of
clay for nose weight (at least, that's what mine had), and I used one just for
some added insurance. The Sandhawk will fly just fine without any nose weight,
and it's only included so that the CP/CG relationship is correct when you fly
it combined.

Quote:
>are there any larger models of this around? (HPR lite?)

Saw a scratch built one prang at the NSL. Ouch.



 
 
 

Terrier/Sandhawk conversion

Post by Chris G » Fri, 01 Apr 1994 11:03:46


i just bought an estes Terrier/Sandhawk(thanks Ross!)
and wondered if anybody had some hints for conversion
to a REAL 2-stage setup.  the 'coupler' looks like it
may be possible to adapt, except for the sustainer
engine positioning.

additionally, actually _having_ a sustainer will require
more weight in the nose.  how stable is the sandhawk
to begin with?

are there any larger models of this around?(HPR lite?)
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Terrier/Sandhawk conversion

Post by Buzz McDermo » Sat, 02 Apr 1994 11:36:48



: >are there any larger models of this [Terrier/Sandhawk] around? (HPR lite?)
:  
: Saw a scratch built one prang at the NSL. Ouch.

Sproketry has received GREAT liftoff shots of both yours (Bob W.) and Chris
Blunks (4xG40) Terrier/Sandhawks.  Hopefully, one or both will get
published with the NSL review article which should be in the May/June
Sprocketry issue (didn't make it in time for the April issue, sorry!).

BTW...Chris's T/S was DEFINITELY high power, not HPR-lite.  It weighted
about 6 pounds and flew on 4 G40s!

Buzz McDermott