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  #41  
Old 11-11-2019, 07:57 AM
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5x7 5x7 is offline
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They probably pushed Estes to develop the E16/F15, is so they were useful for that.
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  #42  
Old 11-11-2019, 09:30 AM
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Agreed, but I understand that the big Quest motors were semi-port burners like the old Estes C5-3 that provided a real kick off the pad with a lower sustaining thrust.
The Estes F15/E16 are end-burners with lower launch thrust.
Unfortunately only Estes remains in the SU BP engine market, and they continue to show zero interest in making anything in the form of a port-burning high thrust booster.
Yes, I'm still "beating this dead horse" and will continue until somebody ( hopefully Estes ) brings back some port burners.
Incidentally I managed to get 2 sealed packs of good-date-code C5-3s off eBay for the reasonable price of $13.99 very recently.
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  #43  
Old 11-11-2019, 10:26 AM
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No gaurantee they would have had a high initial thrust, this quote directly from Bill Stine in April 2009, after the test flights reported here:


We're also trying to perfect a method to get a higher initial flight velocity for the E's and F's

Development canceled after that.
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  #44  
Old 11-11-2019, 10:42 AM
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ghrocketman ghrocketman is offline
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I wonder what happened to the large quantities of motors they produced that they never certified.
Some of us don't give a Rat's Kazoo about certification and would gladly sign a hold-harmless to get them...
Sell them as fireworks... Those have no real certification.
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When in doubt, WHACK the GAS and DITCH the brake !!!
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If you are NOT FLYING LOW in the left lane, you need to GET THE #$&@ OUT of it !

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, if you have to ask, you probably aren't
!
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  #45  
Old 11-25-2019, 08:38 AM
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Royatl Royatl is offline
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Quote:
Originally Posted by ghrocketman
I wonder what happened to the large quantities of motors they produced that they never certified.
Some of us don't give a Rat's Kazoo about certification and would gladly sign a hold-harmless to get them...
Sell them as fireworks... Those have no real certification.


You can always start at the source and call Bill Stine at Estes. Then if he says he left the inventory with Quest, call Charlie at Aerotech.

Odds are, though, that he just had enough made on spec to do product development and testing, initial marketing, and certification submissions.
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  #46  
Old 11-25-2019, 09:58 AM
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Jerry Irvine Jerry Irvine is offline
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Quote:
Originally Posted by ghrocketman
Unfortunately only Estes remains in the SU BP engine market, and they continue to show zero interest in making anything in the form of a port-burning high thrust booster. Yes, I'm still "beating this dead horse" and will continue until somebody ( hopefully Estes ) brings back some port burners.
In a recent favorable correspondence I had with Estes I reminded them the 24mm full D port burner in an E case was already developed and tested by Ed and would be suitable for a wide range of their kits and our fields. Something like a D30 or 40. Ed Brown showed me some before we went to his house and flew a U.S. Rockets Banshee with a U.S. Rockets H120-12 from his back yard. FAA exempt.

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