Aerotech G77 RMS Motor

Aerotech - G77R Reload for RMS 29/120 {Motor}

Contributed by Dick Stafford

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Manufacturer: Aerotech

Brief:
This is a brief review of Aerotech’s new G77 Redline reload kit for the 29/120 case.

AeroTech G77 reload and 29/120 RMS hardware

Construction:
The reload kit contains the typical components: Nozzle, liner, two propellant grains, forward and aft O-rings, forward and aft fiber insulators, ejection charge adhesive disk, FirstFire igniter, ejection charge container/cap, delay element, delay insulator, delay O-ring, delay spacer, and forward delay washer.

The assembly is straightforward and typical RMS, so I won't go into any detail. You can view the full instructions by going to the Aerotech web site, selecting 'Resources', then 'Instructions', and scrolling down to the 29/120-180R instructions. You will need to lube the O-rings and it will of course require the 29/120 hardware.

Here are the salient specifications:

Total impulse 105 N-sec
Burn time (calculated) 1.36 sec
Propellant type Redline
Delays 6 and 10 sec**
Propellant weight 55.4g
Loaded weight (including case) 155g
Length (with case) 5.9 inches
Retail (as of 5/7/05) $13.95

AeroTech G77 reload and 29/120 RMS hardware

** - Can be modified for other delays. See document on Aerotech site under Resources/Instructions/Reload Delay Kit (RDK) and Delay Modification Instructions/RMS Delay Modification Instructions.

Construction Rating: 5 out of 5

Flight:
The down side to this motor is that is had a bit less total impulse than the G79 or a G80. However, it has one distinguishing feature--that bright red flame! My thanks to Randy from TRF, aka 'Rocketmaniac', for the following photo!

Flight Rating: 5 out of 5

Summary:
It sure is cool to have a Redline for the mid power crowd. (You can also get the G67R for the 38/120 case.) I like the igniter and the ability to modify the delay...and did I say the flame? In person, it is brighter than the photo shows.

Overall Rating: 5 out of 5

Comments:

avatar
D.S. (June 24, 2005)
Aerotech recently announced that some RMS-29/120 G77R and RMS-38/120 G67R reload kits were packaged with incorrect instructions. These included reversed inside pages (38mm instructions in the 29mm G77R and 29mm instructions in the 38mm G67R). The correct instructions can be downloaded from the "Instructions" page of the AeroTech Resource Library. As it turned out, I used a set of G79 instructions and didn't originally notice the error.

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