AeroTech Open Thread

[rharshberger]

+1.

Having a G-reload for 24/60 case might even justify buying that hardware.



Aren't those OOP ?
Are they coming back?

a

The G110 SU and G55 SU are long OOP, I doubt we will see them again antime soon. As for a 24/60 case G motor that probably is impossible due to the volume of the case being to small for the required volume of propellant.

 

[Rocketjunkie]

+1.

Having a G-reload for 24/60 case might even justify buying that hardware.

24/60 means the max reload is 60 N-s. You would need a case twice as long for a G. G55s were SU. Loved them.

 

[0011001100]

Having a G-reload for 24/60 case might even justify buying that hardware.

Would be pretty much impossible to fit a G motor (80 Ns of impulse) in a 60 Ns case.

 

[Ronz Rocketz]

Regarding my D20-4W that chuffed, I haven't heard back from Karl since last week Tuesday. I left a message with customer service. I'm hoping he's trying to figure out what's going on with the motors.

 

[terryg]

The 24/60 case was redesigned to be more robust. I wonder if a longer version of the case would work with the same end closures.

 

[mrwalsh85]

Would love to get my hands on some more G110 and G55 24mm SU motors. Anyone know where I can find thrustcurves or .eng files for them (I know they are long OOP).

THIS!

I'm not sure how they'd compete with the CTI 24mm G motors, but I absolutely love these buggers.

I have flown a G110 and a G55 in an Estes Mini Fat Boy - and I absolutely LOVE IT!

I have been buying these up any chance I can get. Think I have about 8 total... I'm a little shy about burning them, but I love burning them.

Wonder if they could be released under the Quest brand?

 

[rharshberger]

THIS!

I'm not sure how they'd compete with the CTI 24mm G motors, but I absolutely love these buggers.

I have flown a G110 and a G55 in an Estes Mini Fat Boy - and I absolutely LOVE IT!

I have been buying these up any chance I can get. Think I have about 8 total... I'm a little shy about burning them, but I love burning them.

Wonder if they could be released under the Quest brand?

I have two of each left and hope to fly them during the TRA Research portion of Sod Blaster 3 aka SodBlaster 2021

 

[FlyBy01]

Bad Aerotech Liners​

AeroTech has discovered that a small number of 54mm RMS reloads were shipped with liners that were cut about 1/4” too short. This may result in a CATO and destruction of the rocket. A K480W reload was recently identified by a customer as having one of the the short liners. Here are others that could be affected: K375 01062102 01062103 01202103 01202105 K700 011420 K1275 01192105 K1103 01252103 If you or any of your customers have received any of these reloads with the corresponding lot numbers, DO NOT use the reload and email Karl Baumann immediately at [email protected]. Thank you for your patience and cooperation. ​

 

[Ronz Rocketz]

Regarding my D20-4W that chuffed, I haven't heard back from Karl since last week Tuesday. I left a message with customer service. I'm hoping he's trying to figure out what's going on with the motors.

Karl called me back. He said they have a number of military contracts that have been on hold and now they want the product immediately so they're very busy.

He said it could be a weak initiator and to use a wire to score the inside and try again. I think I'll try it again in the Estes MR. If it blows up, then I've still got the Boyce MR. I'll have to wait for a low wind day which should be any year now.

 

[AeroTech]

Regarding my D20-4W that chuffed, I haven't heard back from Karl since last week Tuesday. I left a message with customer service. I'm hoping he's trying to figure out what's going on with the motors.

Put a new igniter in it. There is no systemic problem with D20s.

 

[AeroTech]

What is the black powder ejection charge in the new 24mm Q-jets? Is it the same with both types, and all delay options?

D22-4, 7, 10

E26-4, 7, 10

Thank you.

It is 0.7 grams for all D22W and E26W motors.

 

[AeroTech]

Are there any plans for 24mm G motors?

No active plans, but they would make for an interesting DMS development project if the demand was there.

 

[tsmith1315]

I would be interested in a 24mm G if it were SU.

 

[DaHabes]

No active plans, but they would make for an interesting DMS development project if the demand was there.

Bigger is better...

 

[75Grandville]

Question on the plug for the 54mm closure. I'm using a 54mm floating closure, and installed the plug as per the picture below. The delay o-ring doesn't fit, so I assembled with the delay spacer only. First time use - is this the right way?

On a side note - K805G-PS is sold as plugged motor, but comes with delay grain? Confused.

 

[0011001100]

On a side note - K805G-PS is sold as plugged motor, but comes with delay grain? Confused.

Thats so you can have a smoke trail after burnout still.

 

[75Grandville]

Thats so you can have a smoke trail after burnout still.

And ejection charge? Actually, they probably just have one kit that they include with all RMS, which includes ejection charge. Makes sense.

 

[GlueckAuf]

Would be pretty much impossible to fit a G motor (80 Ns of impulse) in a 60 Ns case.

Maybe so, a 133% output over the rating.

Unless you’re Loki Research’s magician Scott Kormeier. His K-627LR motor wrings 1,518 N-s out of the 38-1200 case (126.5%) and the M-1378LR squeezes 5,363 N-s from the 54-4000 (134%).

Gotta love that Loki Red!

Good skies,
GlueckAuf

 

[mrwalsh85]

No active plans, but they would make for an interesting DMS development project if the demand was there.

Hi, my name's Mike and I'm an interested customer!

 

[Walter Longburn]

If you want to know what I'd be super interested in it would be be bigger 54mm motors.

 

[mtnmanak]

Bad Aerotech Liners​

AeroTech has discovered that a small number of 54mm RMS reloads were shipped with liners that were cut about 1/4” too short. This may result in a CATO and destruction of the rocket. A K480W reload was recently identified by a customer as having one of the the short liners. Here are others that could be affected: K375 01062102 01062103 01202103 01202105 K700 011420 K1275 01192105 K1103 01252103 If you or any of your customers have received any of these reloads with the corresponding lot numbers, DO NOT use the reload and email Karl Baumann immediately at [email protected]. Thank you for your patience and cooperation. ​

I posted this in the other thread about this, but I should have posted the question here:

@AeroTech What is the tolerance on the liners? I checked all my liners and I found one that is 1.5mm short. Is that within tolerance?

It is a K1103X lot # 01062104

 

[BEC]

Would be pretty much impossible to fit a G motor (80 Ns of impulse) in a 60 Ns case.

I don't know....the 24/40 case has two 50 N-s reloads (F39T, F24W).

 

[AeroTech]

I posted this in the other thread about this, but I should have posted the question here:

@AeroTech What is the tolerance on the liners? I checked all my liners and I found one that is 1.5mm short. Is that within tolerance?

It is a K1103X lot # 01062104

Normally +/- 1/32"

 

[mtnmanak]

Normally +/- 1/32"

Okay, so this liner is off by 1/16", I assume that I should not fly it then?

 

[mtnmanak]

Okay, so this liner is off by 1/16", I assume that I should not fly it then?

For everyone's benefit, wanted to relay that I got a call from Karl from Aerotech and he said I can use one of the brown fiber discs on top of the seal disc to make up the 1/16" gap. Makes sense. He is sending me a couple discs. Good solution and quick response from Aerotech.

 

[crossfire]

And ejection charge? Actually, they probably just have one kit that they include with all RMS, which includes ejection charge. Makes sense.

The charge is the black powder. Other is just a delay grain. If it's a plugged forward closure there is no ejection charge.

 

[ChicagoDave]

The charge is the black powder. Other is just a delay grain. If it's a plugged forward closure there is no ejection charge.

I thought so to..... until I opened my two K480W-Ps to check the liner length. Aerotech kindly included the 4f.

Note to Aerotech: Not complaining at all - I just use that to start one of my ejection charges so it saved a little 4f from my own inventory. I was just surprised since I remembered other "-Ps" don't typically get the 4f.

 

[Bowman]

For everyone's benefit, wanted to relay that I got a call from Karl from Aerotech and he said I can use one of the brown fiber discs on top of the seal disc to make up the 1/16" gap. Makes sense. He is sending me a couple discs. Good solution and quick response from Aerotech.

I think I'd rather they just send a replacement liner.
I know those phenolic liners are expensive but that's not your issue.

 

[mtnmanak]

I think I'd rather they just send a replacement liner.
I know those phenolic liners are expensive but that's not your issue.

Unfortunately, I had already bonded the grains to the liner. This is a good solution for this case and makes sense. If I hadn't bonded the grains already, I am sure they would have had no problem sending me a new liner.

From now on, I plan to check all the liners before grain bonding/assembly.

 

[tfish]

Unfortunately, I had already bonded the grains to the liner. This is a good solution for this case and makes sense. If I hadn't bonded the grains already, I am sure they would have had no problem sending me a new liner.

From now on, I plan to check all the liners before grain bonding/assembly.

The big thing you need to do is...make sure you feel the orings compress as you tighten the closures. If you don't feel like they are sealing correctly...you can add a 1.990" fiber washer to the top of the aluminum seal disc. https://www.rocketmotorparts.com/Washer_1990_/p1577809_7823725.aspx this should get you back to within specs..

Tony