Rocket R & D 4" Sandhawk

This is my third Rocket R & D (Cluster 'R') rocket. It comes in a bag with 8 pages of detailed instructions. It comes with a metal cable attachment on one of the two plywood centering rings for the shock cord to connect to, and it uses a 15 foot bungie for the shock cord. The body tube has the fin slots precut, unlike the 2.6" version. It uses 7/32" plywood fins (not quite scale) with through-the-wall mounting into some FIRM (Fins with Internal Root Mount) strips, which are small wood strips that glue to the motor mount with a groove for the root edge of the fins to insert into.

So much for the kit. Instead of plywood fins, I am using 0.125" G-10 fins made for me by Public Missiles Ltd. I screwed up the original 54mm motor mount (the fins sagged while curing), so I tore the fins off, sanded down the TTW tabs, and used a LOC 3" motor mount tube with four homemade 3/16" plywood centering rings. I laminated the body tubes with a layer of 1.8 oz. Kevlar® cloth, followed by a layer of 5 oz. and 2 oz. fiberglass cloth. The rocket will utilize dual deployment, with Missile Works RRC2 altimeter in the coupler. I'm using ROCKETMAN R12C and drogue parachutes, and HeatShield parachute protectors and 5/8" Kevlar® shock cord from Pratt Hobbies. Motor retention is assured by an Aero Pack motor retainer. I used conformal launch lugs from ACME Engineering.

Dia: 4.0"; Length: 89"; Wt: 175 oz. (10 lbs, 15 oz.), 181 oz. with 54mm adapter; Motor (1): 75mm (The stock kit is 84" tall, weighs about 75 oz., and comes with a 54mm motor mount)
Manufacturer recommended motors: I211-6W, I357-10T, J180-10T
Status: Active.

FltDateMotorComments
1)5/08/99J415-WExcellent flight, but main chute deployed early. Missile Works RRC2 reported 4124 feet.
2)5/08/99J570-WAnother excellent flight, but main chute deployed early again. Missile Works RRC2 reported 2616 feet.
3)5/30/99K560-WExcellent flight, and dual deployment worked as planned. Missile Works RRC2 reported 8649 feet.
4)5/30/99L850-WExcellent flight, and the rocket obviously broke Mach! Dual deployment worked as planned. My first successful L motor flight. Missile Works RRC2 reported 10,547 feet. Tore the rear launch lug off.
5)6/19/99J415-WExcellent flight, and dual deployment worked as planned. First launch off the blacksky rail. Missile Works RRC2 reported 3556 feet.
6)6/19/99J415-WAnother excellent flight, and dual deployment worked as planned. Missile Works RRC2 reported 3912 feet.
7)7/10/99J275-WNice flight, and dual deployment worked as planned. Missile Works RRC2 reported 2050 feet.
8)8/14/99J415-WNice flight, and dual deployment worked as planned. Missile Works RRC2 reported 4046 feet.
9)9/24/99K550-WNice flight. Missile Works RRC2 reported 5029 feet.
10)9/25/99K560-WExcellent flight. Missile Works RRC2 reported 8453 feet.
11)9/26/99K560-WExcellent flight. Missile Works RRC2 reported 8844 feet.
12)10/9/99K550-WNice flight. Missile Works RRC2 reported 4907 feet.
13)6/10/00J275-WNice flight. Missile Works RRC2 reported 2074 feet.
14)7/15/00J415-WNice flight. Missile Works RRC2 reported 3430 feet.
15)9/15/00K560-WGreat flight. Missile Works RRC2 reported 8703 feet.
16)9/16/00K560-WNice flight. Missile Works RRC2 reported 8594 feet. Landed in shallow salt lake (what a mess).
17)9/17/00K560-WAnother great flight. Missile Works RRC2 reported 8594 feet.
18)10/14/00J415-WNice flight. Missile Works RRC2 reported 4110 feet.
19)4/22/01J415-WNice flight. Missile Works RRC2 reported 4018 feet.
20)5/19/01J415-WNice flight. Missile Works RRC2 reported 3926 feet.
21)6/22/01K560-WNice flight. Missile Works RRC2 reported 8182 feet. Broke a fin off at the root during drag on ground.
22)6/24/01K560-WFin repaired. Nice flight. Missile Works RRC2 battery came loose during drag on ground, so no altitude obtained.
23)10/11/03L850-WExcellent flight, some fin flutter. Missile Works RRC2 reported 10,971 feet.
24)7/17/04K695-RNice flight. RRC2 reported 5602 feet.
25)7/24/04K1275-RNice flight. RRC2 reported 8378 feet.

Pictures
Motor mount/fin assembly.
The completed Sandhawk.
The Sandhawk on a J570-W. 5/08/99.
The Sandhawk on a 75mm K560-W at Medicine Wheel 4. 5/30/99.
The Sandhawk on a 75mm L850-W at Medicine Wheel 4. 5/30/99.
The Sandhawk on a J415-W. 6/19/99.
The Sandhawk on a J275-W. 7/10/99.
The Sandhawk on a J415-W. 8/14/99.
The Sandhawk on a K550-W at HellFire 5. 9/24/99.
The Sandhawk on a 75mm K560-W at HellFire 5. 9/25/99.
The Sandhawk on another 75mm K560-W at HellFire 5. 9/26/99.
The Sandhawk on a J275-W 6/10/00.
The Sandhawk on a K560-W at HellFire 6. 9/16/00.
The Sandhawk on a J415-W. 10/14/00.
The Sandhawk on a K560-W at ROC Lake IV. 6/24/01.
The Sandhawk on a L850-W. 10/11/03.
The Sandhawk on a K695-R. 7/17/04.
The Sandhawk on a K695-R. 7/17/04.
The Sandhawk on a K1275-R. 7/24/04.
The Sandhawk on a K1275-R. 7/24/04.

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