NiceThought you'd like to see the new Q-Jet packaging, including for the White Lightning Q-Jets, coming soon.
View attachment 434113
View attachment 434114
Nice packages!
I've got a question on how you determine your listed max-liftoff weight, and what constraints are used.
Is there an average body tube size you use as part of the calculation? Maybe I just keep thinking of edge cases like a fat lightweight rocket where it's at the liftoff weight for a long delay, but by nature will need a shorter delay despite meeting the listed weight on the package. ( I think I'm just having flashbacks to a flyer bringing up what was essentially a paper mache brick with a motor tube and stubby fins saying "But its under the manufacturer's liftoff weight limit!!")
Are there any updates? I inquired with a vendor last week and he was not able to provide any details when the motors will become available.We are actually getting ready to ship motors to the UK and Switzerland. I would contact Juerg Thuering at [email protected].
Are there any updates? I inquired with a vendor last week and he was not able to provide any details when the motors will become available.
Reinhard
I recently purchased a couple 3-packs of F-24Ws and flew the first one today. No issues with the flight but I ran in to an anomaly with assembly. The dark blue delay spacer stuck out ~1/32" too far past the delay liner, which prevented the aft closure from reaching the threads. I trimmed the spacer to meet the liner, which is how the assembly directions showed, and it closed up just right.
Did you contact Juerg? I know that a shipment was successfully shipped to the UK recently.
We have a shipment heading to Juerg around the end of the month and he still has inventory for immediate delivery.
Any news on Q-Jets in Australia?
Have you ever considered making the K250 a DMS motor..? (possibly with the carbon fiber case) I wouldn't even care if it didn't have tracking smoke.
We're ready to ship when the dealers are ready to buy.
We're ready to ship when the dealers are ready to buy.
Does anyone have a good picture of the K400 in flight?
Here’s a good video I found on YouTube:
The delay spacer is supposed to protrude slightly, it compresses the delay O-ring when the closures are tightened.
Huh, just looked at my sealed F24-4 pack (date code 05151705), and they have a green spacer as well. Same as a sealed E18-4 pack (01231803). The delay length for the F24-4 is about 0.47", and for the E18-4 is about 0.50". My previous 3-pack of E18-4 (just one left) also has a green spacer and 0.50" delay lengths - I don't recall that the delays were too short in flight. I've had this happen once before in 15+ years. I've contacted Aerotech Warranty.<snip>I too, purchased (recently) a pack of aerotech F24-4 reloads for my rms 24/40 case. What I found was a bit troublesome...
I found that the delay elements were NOT of the HDK-11 type. If they were, as specified by the HDK cross reference sheet, the delay length SHOULD have been 0.531" length with a BLACK delay spacer of .094" length.
What I have are delay elements of about 0.47' length, with a GREEN spacer that apparently is 0.14" length. THIS corresponds to a delay element from ab HDK-04 18mm kit with the spacer corresponding to an HDK-02 spacer.<snip>
Huh, just looked at my sealed F24-4 pack (date code 05151705), and they have a green spacer as well. Same as a sealed E18-4 pack (01231803). The delay length for the F24-4 is about 0.47", and for the E18-4 is about 0.50". My previous 3-pack of E18-4 (just one left) also has a green spacer and 0.50" delay lengths - I don't recall that the delays were too short in flight. I've had this happen once before in 15+ years. I've contacted Aerotech Warranty.
Thanks. How does that work when using a HDK? They have a fixed grain length, not associated with a propellant lot.I don’t know what happened in this specific case but part of our manufacturing process is to adjust the delay and spacer length in production based on lot testing. Propellant and delay burn rates vary from batch to batch and with different lots and suppliers of materials. Otherwise the delay times would be out of spec.
Thanks. How does that work when using a HDK? They have a fixed grain length, not associated with a propellant lot.
Karl got back to me quickly, stating the same as post https://www.rocketryforum.com/threads/aerotech-open-thread.125657/post-2055931. The delays supplied with the motor will be +/- 1s. I appreciate the answer!I was just about to ask that VERY question... the explanation of variations in burn rate is completely reasonable and totally believable from what I know about mixing stuff together from concrete to cocktails with propellant somewhere in there... (not that *I'VE* ever engaged in the latter....)
But it does put the expectation of a 4 second delay for a given HDK 11 element used in an F24W motor somewhat dicey ground doesn't it?
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