Nice.Sneak peek at CFF twin cylinder fill system
Nice.Sneak peek at CFF twin cylinder fill system
It is unfortunate that hybrids are being flown less and less at many clubs.
Very true.It doesn't surprise me. Look at all the fiddling last weekend resulting in a no go. Then add in all the GSE required which I don't know of any club that supplies it as a routine part of setup.
That's why I keep saying prefilled flight tanks are the way to go.Very true.
I would really like to know more about the WilsonFX controller boxes in this image.Some hybrid flyers are investing in the future.View attachment 462148
Check out Wilson FX site.I would really like to know more about the WilsonFX controller boxes in this image.
Yes, I had seen some earlier controller boxes that had hybrid fill and dump switches. Unfortunately, their new website is not really operational yet, as far as I can see. I have checked out the http://wilsonfx.com/ site, but there doesn’t appear to be anything other than a placeholder. If anyone has any information about their current hybrid capabilities I like to know about it.Wilson FX at one time at hybrids as an option on their boxes. It appears that it is returning.
System was sent to me to test operation with the new Contrail Fast Fill solenoid valve as well as to confirm that the launch circuit would be able to initiate the resistors used used in the 12 volt igniter. Each of the two launch circuits was able to initiate seven igniters. The O-6300 has seven injectors each having two Pyrodex Pellets and two igniters. The Wilson FX handled the task using a 20 amp relay on each fire circuit. In addition I performed transmission testing to ensure communication over extended distances. The Wilson FX was able to respond to the Fill, Purge and Fire commands on one or both Fire circuits at one then two then three miles away.Yes, I had seen some earlier controller boxes that had hybrid fill and dump switches. Unfortunately, their new website is not really operational yet, as far as I can see. I have checked out the http://wilsonfx.com/ site, but there doesn’t appear to be anything other than a placeholder. If anyone has any information about their current hybrid capabilities I like to know about it.
I think the prefilled tank type hybrids would have a chance to become popular. Most club launches are just not set up for hybrid flyers who need extra time to get rocket ready rocket for fireing.
The new continuous duty Contrail Fast Fill solenoid valve has a .375 orfice versus the BFV .120 orfice. This means faster fill times and the restriction is the cylinder valve not the solenoid valve.Most of the setup time comes down to GSE. If a club has several people launching hybrids, the GSE can be set up prior to the launch and can normally double as a back up for solid GSE. The increase in time on the pad is negligible for smaller hybrids (L impulse and below). For something like an O motor, it may take 10 to 20 minutes to fill with a Pratt BFV.
Successful L3 certification on a Contrail M1491 using new “Ring of Fire” igniters developed as a collaboration with UT Knoxville and Contrail Rockets. $105 M reload including nitrous, and instant ignition
With the introduction of the CNVA which produces a hollow cone vortex in the NOS injectors that rotates at about 1200 rpm a higher temperature ignition became necessary.
I initially returned to red iron Thermite as used in the Contrail hybrid motors certified in 2005. Working in collaboration with the University of Tennesee a safe stable shippable formula of copper Thermite. While UT was applying this to the fuel grain I looked at a method to move the ignition above the injector and the aggressive flow of the CNVA. Contrail Rockets is calling this composition and process the used the “Ring of Fire”. The cup and composition fit inside the CNVA injector baffle and include a hole that allows the internal vent to exit the motor thru the combustion chamber. The copper oxide in the composition lowers the disassociation temperature of nitrous oxide enhancing ignition of the motor. Twin igniters are used thus a primary and backup igniter are installed during motor assembly. Using resistor igniters or shunted e-matches in an inert motor waiting for the oxidizer to be loaded at the pad is safer then the ejection charges installed during rocket assembly. Here is a picture of the “Ring of Fire” being assembled in a 54mm 20 inch Motor. This motor has yet to be tested by TMT. Properly assembled this ignition method ensures that when you fill your hybrid motor you launch your hybrid rocket.View attachment 465597View attachment 465599
You mean like a 36 inch 98 mm M six inch grain with 42 stars.
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