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  #1  
Old 01-10-2013, 10:47 PM
ManofSteele ManofSteele is offline
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Default Estes F15 Engines

So, now we know - The motors at S&T were Estes F15s.... I wonder what these will cost?

I wonder if there will be problems when people try to fly these in heavy models that use composite 29mm motors. I wonder if they will work in the existing Estes 29mm kits - especially the Nike Smoke and Big Red Max?

Matt
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  #2  
Old 01-10-2013, 11:25 PM
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If they are BP or any other low ISP propellant they will only be suitable for lightweight models. The modal delay will be short.
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Old 01-10-2013, 11:28 PM
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They are black powder, almost full F, but apparently not contest certified?
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Old 01-10-2013, 11:37 PM
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The F15 is an interesting choice for Estes. Peak thrust is lower than a D12 and avg thrust isn't much higher. I hope this is just a beginning.

Just in case some of you didn't get the NAR email...

Quote:
The following motor has been certified by NAR Standards & Testing for general use as a Model Rocket Motor effective November 25, 2012.


*************************************
Estes:

F15-0,4,6,8
29mm x114mm
49.61 Newton-seconds Total Impulse
25.26 Newtons Peak Thrust
14.38 Newtons Average Thrust

Propellant mass: 60.0 grams

*************************************
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Old 01-11-2013, 12:39 AM
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Any new news is good news in my book. Anyone have any idea what the typical time period is between certification and product in stores? (Not that I've had the chance to fly an E12 yet. But then, that might not be a bad thing.)
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Old 01-11-2013, 12:51 AM
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Quote:
Originally Posted by tbzep
The F15 is an interesting choice for Estes. Peak thrust is lower than a D12 and avg thrust isn't much higher. I hope this is just a beginning.

Just in case some of you didn't get the NAR email...



Thanks for posting the specs.

Just seems like a strange motor to market, really. I'd consider that to be a 'hot' E motor really.....just does spec over into F range.

What one would use it in other than some min diameter rockets, I'm not sure. Some what like the old FSI F7s........they made good 1/100 scale Saturn V thrust build-up scale launcher motors (two placed in opposing direction in the flame trench of the scale launch pad......looked pretty realistic).


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  #7  
Old 01-11-2013, 07:11 AM
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Quote:
Originally Posted by Gus
They are black powder, almost full F, but apparently not contest certified?



The won't get contest certification until they are generally available.
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Old 01-11-2013, 07:18 AM
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Quote:
Originally Posted by ManofSteele
So, now we know - The motors at S&T were Estes F15s.... I wonder what these will cost?

I wonder if there will be problems when people try to fly these in heavy models that use composite 29mm motors. I wonder if they will work in the existing Estes 29mm kits - especially the Nike Smoke and Big Red Max?

Matt



We haven't got the RASP file done yet but if you pick some numbers off the curve on this sheet and plug them into your favorite simulation program you'll have an answer.
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  #9  
Old 01-11-2013, 08:03 AM
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Thanks for the info, Matt & Bill.

Scott
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  #10  
Old 01-11-2013, 09:46 AM
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Now that this information is out I can add the following. Except for the Mega Dear Red Max these BP F engines fly all of the new Pro Series 2 rockets just fine. I've flown models up to 24 ounces with these engines and they all flew perfect. I know I would NOT fly a 24 ounce model with a D12 but they fly fine on these 29mm BP motors.

John Boren
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