Friday, May 15, 2009

New Aerotech Catalog Out!

Having a very very very geeky moment. The 2009-2010 Aerotech Catalog was released today. It incorporates the new Mojave Green motors, plus the Warp-Nine endburning 'moonburners'.

One of the biggest and best changes I see, besides of course the new motors, is the color coding of the motor thrust curves. The old (2007-08) catalog that I have the hard copy of has all the curves in different bright colors, with no two motors on one graph having the same color. Visually interesting, but not particularly helpful. The new catalog has the different 'flavors' - W, T, R, G, J, FJ, N - matched to the colors of the curves.
From this I note several interesting things. The D6, E6, E7, F13, and G12 RC motors all have Blue Thunder propellant, normally a fast-burning propellant, but these are all low, flat curves, which I suspect are endburners. The same pattern is seen in the 54mm J180T.
No single motor casing has all 7 flavors available for it. The 29/40-120 has all but N; the 38/360 all but FJ and the 38/480 all but G (both have the fast and slow burns Ns, though).
Reline and Mojave Green have almost identical burn patterns.

here is a great chart of casing size versus propellant showing all but the most recent arrivals.

Now: the changes in motors, with many new arrivals and a few losses.
The D10W and F32T have joined the 24mm SU lineup.
The G78G has joined the 29mm SU and LMS lineup.
The I65PW, J125PW, and K1050PW LMS and J420R SU motors are gone, but the K250PW LMS has been joined by the I350PW SU.
The 24/60 RMS system with the F35W is new.
The 29/120 has a 9th motor available: the G76G.
The H250G is now available for the 29/240 hardware - I could fly it after I get the seal disk from Apogee.
The 38/260 adds the I49N and I245G; the 38/480 adds the I59WN; and the 38/720 adds the J500G.
The 54/852 J90W is not new, but tis thrust curve was absent from the old catalogs.
The 54/1706 adds the K805G; the 54/2560 adds the
K270W and the K1050W.

There are many new reloads for the 75mm and 98mm casings:
75/3840: L1390G
75/5120: L1170FJ, L2200G, M1500G
98/2560: L339N (25.4x greater impulse than the G339N with the same propellant, but the same average thrust.)
98/7680: M2100G
98/10240: M1800FJ
98/15360: N1000W, N3300R

For one-use motors, 4 were lost and four were gained, but the new motors are smaller, more interesting, and more useful motors than the old ones and include a 24mm F and a D prefect for smaller 18mm rockets. For reloads, 19 new reloads including a new casing are introduced without dropping any of the old line.

Well done, Aerotech. I look forward to trying some of your new motors soon, including the F32T (already owned), G78G (machbuster), and perhaps some of the Mojave Green reloads.


KenKzak said...

What do you mean at the top of your post when you say; Warp-9 endburner'moonburner'?
No relation between the two geometries except the goal of increased burn duration.

All of the longburn Warp-9's are end burners.
The R/C glider loads are also enburners.
Because an endburner has much less burn surface area, it must use a faster burning propellant to maintain an adequate chamber pressure and thrust. Thus the Warp-9 and BT propellants
The J180T is a Moonburner along with the other longburn 54mm motors;J90, J135, K250, etc.
A Moonburner has a core up one side of the grain [in this case a shallow sawcut slot] instead of a central core. This creates a motor that burns twice as long as a Bates or Coreburn motor of the same diameter and recipe.
AT makes other moonburners in the larger diameters

The EGE said...

Oh. I see. I had no idea they were truly different. I defer to your greater knowledge.
Is there any way to tell which type it is without personal knowledge of the motor?

KenKzak said...

Correction; Only the long duration glider loads are endburners, which were the ones you listed anyway. I'm not sure what the F23 is.

As I said, a good rule of thumb is that a moonburner will bure twice as long as a Bates or Coreburn motor of the same diameter and recipe. C-Slot motors too.
End burnerers will have the lowest thrust and longest burn duration for a given diameter despite being made with a fast propellant recipe, typically.
The only Moonburners Aerotech currently makes are 54mm and above.
Apparently all are White Lightning.
In the pre-reload days Moonburners were made all the way down to an 18mm D9, but they were labor intensive to make, and prone to user error. It was difficult to install the ignitor correctly, and then difficult for the motor to expell the ignitor properly after ignition.

I make my own Moonburners these days. I found ways to cure the problems with the small ones.

Ken Moonburners Forever K

The EGE said...

Ooops, I'm an idiot.... the D10W is 18mm, not 24mm.