Aerotech G79 RMS Motor

Aerotech - G79 RMS Motor {Motor}

Contributed by Dick Stafford

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstarstar
Manufacturer: Aerotech
AeroTech G79 reload and 29/120 RMS hardware

Brief:
This is a comparison review o' Aerotech’s new G79W, shiver me timbers, includin' t' new 29/120 RMS case.

Construction:

Although this product was introduced at LDRS 23 in July 2004, arrr, me casin' (S/N 037) has a manufacturin' date o' 1/8/02. Ya scallywag! This product be obviously in the works for a while. Begad! T' case is new and is nay interchangeable with the 29/40-120, but t' closures are t' same as those used with t' 29mm high power cases. Begad!

T' reload kit is a typical AT reload so I won't go into the details--liners, insulators, shiver me timbers, O-rings, two slugs, arrr, etc. Ya scallywag! Here is a comparison between t' G79 and t' G80:

G79 ¹ G80 ²
Type RMS SU
Total Impulse (N-sec) 115 120
Burn Time (sec) 1.5 1.5
Propellant Weight (g) 58.6 57.4
Propellant Type White Lightning Blue Thunder
Delays (sec) 6, 10, 14 4, 7, 10
Igniter First Fire Copperhead
Loaded Weight (g) 158 120
Length (in) 5.9 4.88
Retail (as o' 07/20/04) $11.95 $18.95
Notes: ¹ per AT. ² per NAR.

T' main trade-offs include:

AeroTech G79 reload and 29/120 RMS hardware
  • You have t' build t' motor instead o' just slappin' t' single use G80 in.
  • Loaded motor is slightly heavier and just a hair less oomph than t' G80.
  • Longer than t' G80, arrr, which is a problem if you used a (evil) motor block.
  • T' longer delays may or may nay be beneficial t' you. Well, blow me down! Ahoy! I'd rather have a -4 than a -14. (I overbuild, what can I say?)
  • Much better igniter with t' reload. Well, blow me down! I'll be dippin' fewer igniters than before.
  • T' reloads are much cheaper. Ahoy! I hear t' G80s are headed up in price again.

Construction Rating: 5 out o' 5

Flight:
I have flown this twice...and I like it. Ahoy! Lots o' white smoke like me beloved G80FWLs. Blimey! I do have two observations:

  1. T' delay components all fit together easily, whereas on t' 38mm RMS it takes some effort (very little, me bucko, ya bilge rat, but some) t' get it together. Begad! Begad! A good example is the delay spacer--this one fell right in. On t' 38mm RMS I have t' work them in.
  2. T' threads o' t' forward closure were t' dirtiest I've ever seen in an RMS (post flight, o' course). Blimey! Also, thar be lots o' gunk betwixt t' liner and t' case on t' forward end. Ya scallywag! T' aft end was nay unusually dirty.

I will monitor T' Rocketry Forum t' see what other people’s experiences are.

Flight Rating: 4 out o' 5

Summary:
I am ecstatic about this product release. Begad! I love G80s and t' G79 is a lot cheaper. Avast! (Not as cheap as $10 G80-FWLs from Magnum, but those days are gone for good.) In more good news, arrr, AT has promised Redline loads soon. Begad! (I though I saw Blue Thunder reloads too, matey, me bucko, but cannot find t' reference.)

Overall Rating: 5 out o' 5

Comments:

avatar
B.S. (July 29, 2005)
I have flown the G79R 4 times and the results are great. Assembly went together without a hitch. Clean up was easy with minimal work. And the RED FLAME, all I can say is try it for yourself. A big thumbs up to Rocketmotion for showing me the ropes. This new 29/120 has only a few reloads for it now. I hope for are in the works, I give it 2 thumbs up.
avatar
D.S. (August 1, 2005)
I'd point out that the G79W is not a red motor, so the previous comment should be in relation to the G77R.

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