CEDAR CITY, Utah USA — The National Association of Rocketry (NAR) Standards & Testing (S&T) Committee has certified AeroTech's new, redesigned G80T Blue Thunder™ single-use model rocket motor at 136.7 N-sec total impulse.

The new G80T is the highest performance single-use model rocket motor ever certified by the NAR. The new 137 N-sec rating represents a 42%+ increase in power over the previous G80T design.

The motor features an all-new molded phenolic casing with a built-in thrust ring, and ships with a FirstFire Jr.™ 2-lead igniter. Delay times will be offered in 7, 10 and 13 seconds which are intended to directly replace the current lineup of 4, 7 and 10 seconds. The suggested retail price for the new G80T will remain unchanged at $25.95 each.

The new G80T motors and outer packaging will be marked with a prominent label that differentiates them from older G80T motors and displays the new NAR-certified 137 N-sec total impulse rating. The first batches of motors are in production and shipments to dealers and distributors are expected to begin in the next few weeks.

The NAR certification document for the new G80T is now available for download in PDF format from the AeroTech Resource Library on the "Certification Documents" page at http://www.aerotech-rocketry.com.

AeroTech Consumer Aerospace is a division of RCS Rocket Motor Components, Inc., Cedar City, UT.

12-07-2007 01:28 PM  #1
H_rocket Certified Level Three   Joined: Aug 2006 Posts: 494	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse I've see way too many fin cans obliterated by the old G80, This time Gary will need some serious public run time to convince me it's safe to go back in the water,

12-07-2007 04:28 PM  #2
fox_racing_guy Certified Level Two   Joined: Mar 2007 Posts: 122	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse I agree with H_rocket, I had one grenade this past summer. Lucky for me it just blew the nozzle out and didn't blow sideways. I have 7 more of the same motor but don't really like playing Russian Roulette. Aerotech did replace it with a G77R LMS and I really liked the way it burned.

12-07-2007 05:01 PM  #3
heada Certifiable   Joined: Apr 2007 Posts: 811	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse From what I remember there was a batch code that had nearly all the failures. Call up Aerotech and read them the batch code and they'll tell you if it is part of the batch that had problems. The new (again) G80 looks very nice, I just wish they kept a 4 second delay as an option. -Aaron

12-08-2007 07:53 PM  #4
ncrocketeer Certified Level Two   Joined: Oct 2007 Posts: 232	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse I'd love to see one of these motors in a reload. I just like the reloads better. They are less expensive, and the cases are stronger. I really like BT propellant in my Cheetah. I've flown the F39 alot, and the F52 a few times. It really gets that thing going quick, and it goes so perfectly straight. A G80 in a reload would scream so high they either have to cert a 12 second delay or I'd have to use an ALT in it. Even on a G64 the 10 second is not quite enough in my Cheetah. On an F52 I have to get the 11 for it. I've seen the G80 in a Initiator and it is so fast everybody laughs like it was a Warp9 launch. I love those high thrust launches. It doesn't have the smoke and fire wow factor, but it does have the performance wow factor. This would be a great motor for the 29/40-120 case. Cut the thing in a 2 grain config for shipping, and this would be a seller. I'm gonna put that Cheetah up ona G77R next time I go to Orangeburg. Maybe I'll get a whim and try one of these new motors if he has the new ones available. I've been looking for something that'll put it over 3000 feet with more max thrust. The G77R sims to about 2900 and pulls 27G's, but it doesn't go as high as the G64 at 3000. If I could get 3200 in the 30 G range that would be awesome.

12-08-2007 07:59 PM  #5
heada Certifiable   Joined: Apr 2007 Posts: 811	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse The new G80T has the following delays: 7 seconds; 10 seconds; 13 seconds. They dropped the 4 second delay. The statement is, anywhere you'd use the shorter delay, move up to the higher delay as the motor now has more total thrust and will make the rocket go higher/faster. (4=7, 7=10, 10=13) If you're looking for a reload G with more punch than the G80T, there is a G104T that fits the RMS 29/100 case. Higher average thrust but lower total thrust, available in 6/10/14 second delays. Since it has more that 80N average thrust, you must be certified level 1 or higher to use it. -Aaron

12-08-2007 09:54 PM  #6
ncrocketeer Certified Level Two   Joined: Oct 2007 Posts: 232	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse Wow, thanks a bunch, I didn't know about that 13. I had heard they dropped the 4 second. I knew about the 104, but would rather stick with the 29/40-120. It's a great case with alot of reloads. More would always be better. More motors and less casings are always good. I ran a sim on the G104. A G71R pulls as mnay G's on liftoff, but the G104T goes 600 feet lower. It's only showing 82 N-s of total impulse. There just isn't a BT reload in that range of the new G80. My bet is they could take that motor and make a reload out of it with two grains and it would be awesome. These new motors they are coming out with are definitely a new breed. They are really getting the performance out them. They are doing their homework at AT. That's for sure.

12-10-2007 02:24 PM  #7
Loopy NAR Level 1   Joined: Dec 2007 Posts: 68	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse Quote: The new G80T has the following delays: 7 seconds; 10 seconds; 13 seconds. They dropped the 4 second delay. The statement is, anywhere you'd use the shorter delay, move up to the higher delay as the motor now has more total thrust and will make the rocket go higher/faster. (4=7, 7=10, 10=13) If you're looking for a reload G with more punch than the G80T, there is a G104T that fits the RMS 29/100 case. Higher average thrust but lower total thrust, available in 6/10/14 second delays. Since it has more that 80N average thrust, you must be certified level 1 or higher to use it. -Aaron Losing the 4 second delay kinda sucks for the booster of the Aerobee Hi, though. Oh well. I'm probably gonna use the G71 for the 29/40-120 anyway. Close to the same initial kick as the old G80, which is the recommended booster for that kit. Still - sounds like an awesome motor!!!!

12-10-2007 07:17 PM  #8
ncrocketeer Certified Level Two   Joined: Oct 2007 Posts: 232	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse That G71R for the 20/40-120 is a kick butt motor! I have two of them to fly and next time I get out to one of the big fields it's going up in my Cheetah. 27G of Red butt kicking awe struckishness!

12-11-2007 11:58 AM  #9
Loopy NAR Level 1   Joined: Dec 2007 Posts: 68	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse Quote: That G71R for the 20/40-120 is a kick butt motor! I have two of them to fly and next time I get out to one of the big fields it's going up in my Cheetah. 27G of Red butt kicking awe struckishness! My PML Amraam 2.1 loves that motor! I'm sure your Cheetah will enjoy his ride into the great beyond...man, that things gonna go and go...lol

12-11-2007 01:16 PM  #10
ncrocketeer Certified Level Two   Joined: Oct 2007 Posts: 232	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse It goes about the same as the G64. It sims slightly lower, but it leaves twcie as hard. It simmed to 2900 feet. I've flown it 3 times on a G64 and that thing is gone for like a full minute. It's gets somewhere between 3000-3200. Something tells me that this particular Cheetah will go a little higher than the 2900 feet. Mine seems like it does a little higher than the sims. I have to go to the longer 11 second delay on the F52. It calls for an 8 on the F52. On F40's I go with a 10 second. It's gonna be one of those launches where you got a bunch of eyes for it when it comes back into sight. I'm gonna fly the G71 just because it's gonna be funny. There will be a red flash and then it will teleport into another dimension for 1 minute and come back. I bet that AMRAAM is really cool on that. I saw one of those 2.1 AMRAAM's and they will kick butt. Put a J570 in it! LOL You'd need tracking to find it.

12-11-2007 02:07 PM  #11
Loopy NAR Level 1   Joined: Dec 2007 Posts: 68	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse Quote: I bet that AMRAAM is really cool on that. I saw one of those 2.1 AMRAAM's and they will kick butt. Put a J570 in it! LOL You'd need tracking to find it. Alas - the 2 inch AMRAAM only has a 29mm mount, so the J570 will not QUITE fit... Still one of my favorite rockets though. Loves any G load I feed it, and will probably get an H128 next spring sometime if the wind is right...

12-12-2007 01:01 AM  #12
ncrocketeer Certified Level Two   Joined: Oct 2007 Posts: 232	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse I simmed the AMRAAM 2.1 on a H128W with the medium 10 second delay and it was a tad early deploying. I then simmed it manually, and set it for a 12 second delay and it was perfect. It will take a long 14 second RDK drilled down to a 12. With the 12 second delay, velocity at deploy was 9.91 fps. The rocket went 2533' ALT, 513.11 fps, pulled 17 G's off the pad. With an H165R (I believe that fits the same case) it sims to 2627' ALT, 560.28 fps, and it pulled 21.48 G's off the pad. Velocity on that sim at deploy was 18.66. Same 12 second delay. That squarish wave of the redline really keeps honkin' around the mid part of the burn. It's alot harder off the pad too. Definitely flights for the bigger fields and low winds in the afternoon. Both of those would be awesome flights. Get video of that! Edited: Those flights assumed a rocket mass of 31.22 ozs with motor on both sims.

12-17-2007 07:22 PM  #13
jsdemar NAR/TRA L3   Joined: Oct 2006 Posts: 350	Re: NAR certifies redesigned AeroTech G80T motor at 137 N-sec total impulse I see some bragging about the Isp for this motor. The generic calculation of the published avg total impulse gives: (136.7/0.0625)/9.81 = 223 s. If you take the published thrust curve and do the calculation, you get an Isp = 217 s. Do the same thing with the 100N-s G80 and you get an Isp = 212. A whopping 2.4% increase, which is the same as the standard deviation of the measurement. If you consider that a portion of the delay grain burns under pressure and contributes to the total impulse during the burn time, the Isp drops to about 212 s. using the higher value of the published total impulse of 136.7. Or Isp = 206 s using the total impulse from the published ENG file. I don't see anything new here except the volume loading increase due to the Bates grain vs. C-slot. This gives the higher total impulse, but no affect on the Isp other than less of a regressive curve (runs at higher pressure longer). -John DeMar