AT E11-3?

[gpoehlein]

Just out of curiosity, does anyone use the E11-3 reload? If so, what do you use it in? I got a pack of these reloads a while back, but the delay is so short, I haven't found anything it works well in. In a Big Daddy (the model it was suggested I use it in), Rocksim shows the ejection velocity at 68 f/s (I flew it in the Big Daddy, and tore 5 of the 6 shroud lines from the chute). In a Maxi Alpha, the ev is 37 f/s. Rocksim says it will eject at 60 f/s in the BT-60 upscale Groove Tube I'm building. So what CAN you fly it in that won't shread the chute or zipper the model because of high ejection velocity? (I'm still trying to figure out why Aerotech only issued this motor with a 3 sec delay and nothing longer.)

[J Blatz]

I have not flown this, but I am sure that the short max delay is due to lack of length in the delay column section of the forward closure.

I will say that those 24 and 29mm Blackjacks have a real "soft" end of burn - I'd be that the E11-3 would work fine in any rocket that uses a D12-3.

[plano-doug]

(I'm still trying to figure out why Aerotech only issued [the E11] with a 3 sec delay and nothing longer.)

I wondered that, too. Turns out, with the slow burning propellant, that too much delay gets consumed during the motor's burn time. All you're left with is 3 seconds. They would either have to come up with a different, slower delay formula - ie, non-standard - or a different, longer forward closure - non-standard again.

I concluded AT doesn't see enough return on investment to go to all the trouble required to add longer delays (for this motor type).

But, with the smaller altimeters available nowadays, you could consider using electronic deployment and leave out the motor ejection charge. Altho, for a low thrust motor, you'd have to build the e-bay extra light, which is easier said than done. That is, with a slow burning, low-thrust motor, altimeter ejection is maybe too much of a stretch to be a reasonable option.

Which relegates the motor to use in high-drag (short coast time) applications - cones and saucers, for example. And gliders, sans delay, which is where this one comes from, I think.

Doug

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[Zeus-cat]

There was an E11-5 at one time, but I haven't seen it for sale in years. I still have one as a matter of fact.

I think the E11-3 is suitable for a draggy rocket that files well on a D12-3. The extra burn time over the D12 may not add much to the forward velocity so the ejection is just about right.

[n3tjm]

E11-3's are one of my favorite reloads. I really consider them E11-5's since the delays I get from the range fro 3 - 7 seconds. Last pack I had was a very consistent 3 seconds.

[Donaldsrockets]

I flew one in a Quasar One Sky Needle (6 foot tall Mean Machine) style rocket with no problems.

I'd say the delay was in the 4-5 second range. Other than the plastic chute stripping, it was a great flight.

[gpoehlein]

I flew one in a Quasar One Sky Needle (6 foot tall Mean Machine) style rocket with no problems.

I'd say the delay was in the 4-5 second range. Other than the plastic chute stripping, it was a great flight.

Yeah - that's the same thing that happened with my Big Daddy. The boost was incredible but the ejection was too early for the model and stripped the shrouds from the chute. I'm lucky it didn't zipper.

So that's what I want to know - anyone know of any designs that LIKE a short delay and would work well with this short delay? Hmm... Maybe a big glider like the upscale Sky Dart? What else likes short delays? (I've got two more of these reloads - I wanna use them in SOMETHING! )

[JPVegh]

Works great in a super big bertha/broadsword.

[qquake2k]

I've flown my Executioner several times on E11-3's. It loves them!


http://www.youtube.com/watch?v=yZtbIFRE9hY

[kjohnson]

I used to fly my Hawk's Hobbies Super Sprite on this motor.

kj

[AstronMike]

So that's what I want to know - anyone know of any designs that LIKE a short delay and would work well with this short delay? Hmm... Maybe a big glider like the upscale Sky Dart? What else likes short delays? (I've got two more of these reloads - I wanna use them in SOMETHING! )

Yes, sort of. As a matter of fact, I've flown a BT70 SkyDart on F12s many times, but I'd say that an E11 isn't going to cut it. That glider is built with regular BT70 and uses Adams Readiboard for all the flat surfaces, whilst the pod is the foil lined BT50 and has enough ballast at its end for boost stability. Total weight sans motor of like close to 11z.

If you did a BT60 version the same way, it would be great on D12s and E11s, since I have that too and flown it enough. Was even considering making a kit out of that but decided against it.

[Rocket86]

I've flown my Executioner several times on E11-3's. It loves them!


http://www.youtube.com/watch?v=yZtbIFRE9hY

That looks awesome! I've been holding off using the E11-3 in the Executioner out of concerns the delay was too short. Yours looked perfect. Nice camera wirk to catch that btw. E11 it is!

[qquake2k]

That looks awesome! I've been holding off using the E11-3 in the Executioner out of concerns the delay was too short. Yours looked perfect. Nice camera wirk to catch that btw. E11 it is!

My Executioner weighs in at 9.1 oz, and the 3 second delay seems about perfect. It would probably be good in a Mean Machine or Maxi Alpha III too, but I haven't tried it yet.


http://www.youtube.com/watch?v=l9yQsHJAvuA


http://www.youtube.com/watch?v=kCo62lk4knM

[BobH48]

What else likes short delays? (I've got two more of these reloads - I wanna use them in SOMETHING! )

Saucers like short delays. I had two packs of these and then someone GAVE me 2 more packs. I have used all but one of them in Art Applewhite saucers, Stealth, Scimitar.

[MarkII]

I fly my Der Fat Max on F12-3s. It does great on them and the 3 second delay seems to be just right. The thing is, though, that it goes ridiculously high on that motor. To get some lower flights I might try it on E11-3s.

The Max was kitbashed from a Fat Boy but I didn't use some of the FB construction techniques. I upgraded the motor mount to 24mm (obviously) and used papered basswood for the fins instead of the standard balsa. (The DFM modification requires a new set of fins.) So mine, I'm sure, is a little bit heavier than spec. I don't know this for a fact, but I suspect that short fat rockets don't coast as well as longer ones, so they may require shorter delays.

I don't know why the 3 second delay didn't work for your BD. Are you sure that the delay was too short? Could it have actually ejected late? Even though the Daddy is wider and longer than the Boy, your rocket could conceivably be lighter than mine if you built it stock. I also pack my Fat Max with a nylon parachute, which weighs a bit more than a standard Estes plastic chute, and I use a Nomex protector in it, which weighs more than TP wadding. So the stubby profile, the larger and draggier DFM fins and all of the other weight-adding mods (perhaps as much as an ounce added) might explain why it does well with the short delay of the F12-3.

[qquake2k]

That looks awesome! I've been holding off using the E11-3 in the Executioner out of concerns the delay was too short. Yours looked perfect. Nice camera wirk to catch that btw. E11 it is!

Resurrecting an old thread here. Did you ever fly your Executioner on an E11?