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REV 2.4 - Tue Aug 17 08:34:31 2010

Estes Industries
Terrier Sandhawk
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ROCKSIM FILE: MISSING - please submit here
SpaceCAD FILE: MISSING - please submit here
REC'D MOTORS: D12-3, D12-5, E15-4, E15-6; with adapter: B4-2, B6-2, C6-3

(Contributed - by Yitah Wu) 

This kit has been discontinued, but there's still more than a few floating around - I've seen some at out of the way hobby stores as recently as 6/97. 

I started this kit in 2/97, and finished most of the Sandhawk (less fins) and recently started to finish. 

The Sandhawk portion of this kit is the same as the old Sandhawk kit. Lots of plastic, both on the fin can and on the payload/nosecone section. The tool must be getting old or something as the fits are not great and there's some slight sink marks here and there. 

The kit is designed to be flown either as a Terrier-Booster with a  "Sandhawk" Nosecone, or as the Sandhawk alone.  I've heard that you can  electronically stage the Sandhawk, but don't see how this can be easily done since the adapter connects to the Sandhawk where the engine is. 

After reviewing Bob Wiersbe's information on this, it turns out you have to modify the Sandhawk Engine mount during construction of the  Sandhawk, so I'm SOL.  I'm going to try to scratch out my own Sandhawk to see if I can make this work. 

Construction is straightforward and simple, though  the engine mount instructions for the Terrier are confusing and garbled.  If you follow the diagram at the bottom showing the 2 centering rings to be 2" apart, you're okay - ignore everything else.  The Terrier fins are 2-piece plastic injection molded construction - High quality stuff, though I'm worried that the leading and trailing edges are too thin and will be easily damaged. 

Everything has been sanded and primed.  It's plain but fly-able. 

I haven't assembled the antennae yet, as I'm planning to do the piano wire modification that's recommended (The plastic ones break off too easily I'm told) 

More as I finish.... 

[Submit your Opinion]

07/01 - "I built my Terrier/Sandhawk several years ago when it first came out. This has always been one of my favorite rockets. It has innate style and beauty. I had built my kit pretty much stock per the instructions. I didn't find any real errors with the way Estes had done things. Of course I have building models for years now so when I make improvements more out of habit than dwelling on why the manufacturer chose not to do it my way. However, if you build it per their instructions you will have a fine flying model. Make sure you don't forget to add the clay nose weight to the Sandhawk's nosecone because if you fly the Sandhawk by itself you'll need it. I did go with the music wire antennae and I am very glad I did. they have help up very well thru the years. Flying this model (Terrier booster and Sandhawk sustainer) on a D12-5 will yield an acceptable flight to about 400'. I have flown my T/S on a 24mm AT E28-7T RMS. This motor really rocks in the T/S with an altitude of around 1000'. Unfortunately on one flight the motor blew its forwards and aft closures and demolished the interstage joint between the booster and the sustainer. The rocket sat for a few years in my shop just gathering dust. I had built a 3", 29mm HPR version to fill my desire for this rocket so I had no real motivation to fix my Estes version. I did manage to repair the motor mount on the Sandhawk so I could fly it by itself on a D12-5. A D12-5 in the Sandhawk alone really makes it cook. It usually goes to 900' on this motor. With a 18/24mm adaptor you could fly this rocket by itself on C or B engines for smaller fields. However, recently I dusted the booster section off and tried to figure out a way to make her whole again. I finally found a use for those yellow tubes that Estes gives with their kits for motor hook and motor block spacing and installation. It made a great tube coupler. I epoxied half in a BT-50 stuffer tube then epoxied the other end in the section of booster motor tube. Now all I had to do was keep the stuffer tube centered in the booster body tube. The CATO had only damaged the internals of the interstage joiner. I fabricated a centering ring from 1/8" ply and epoxied it at the top of the booster section. Now I needed a really strong way of joining the two sections and still allowing the ejection gasses to pass. I decided to use a spent D motor casing with the insides cleaned out. It provided the right amount of lateral rigidity. About 1/3 is epoxied into the booster's new stuffer tube and the Sandhawk motor tube slips right over this. All that was needed was to file a notch so the Sandhawk motor hook could catch and be retained thereby keeping the two parts together. The refurbished Terrier/Sandhawk flies great. I haven't used an E28 yet but I enjoy the flights I get on the standard D. If you do happen to find this great Estes kit or it's distant cousin, the SM-3 Seahawk, I heartily recommend buying it." (J.B.)

[Enter Rocket Specific Tip]

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[Enter Flight Log]
Date Name Motor Ejection/
Wind Notes
05-27-2001 Jeff Brundt Est SU D12-5 Apogee - Perfect Calm - Great flight for this veteran rocket.
10-28-2001 Jeff Brundt Est SU D12-3 Apogee - Perfect 10+ mph winds - Nice straight boost. Ejection at apogee but unfortunately crap Estes 24 in chute failed due to damn cotton shroud lines. Rocket came down too fast and broke 1 Terrier fin. Rocket is repairable though.
10-28-2001 Jeff Brundt Est SU D12-5 Apogee - Perfect 10+ mph winds - Only the Sandhawk flew this time. Nice boost and insane altitude on a D12-5. Used an 18 in chute but it still drifted. Nice flight but long walk for recovery.
03-02-2008 Doyle Tatum Est SU D12-5 Apogee - Perfect 5-10 mph winds RIP - Just the Sandhawk (broke the Terrier years ago). Great flight ...BUT... the parachute didn't open all the way and it landed in some small trees (easily reachable) on the other side of the raging creek! Ooops. Status: Tree/Roof

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