#11
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The only nation to use floating head pistons was the U.S. Floating head pistons were banned the year after the U.S. won altitude and scale altitude at the World Championships in Ukraine. In all fairness, though, one of the objections to floating head pistons is that our piston tubes would fly 20 - 30 feet in the air and then come dropping down on the heads and rockets of our neighboring competitors. Unlike U.S. competiton, International events have each country launching from their own narrow lane. Having piston tubes raining down on your rocket sitting on the pad was pretty annoying. Don't recall that we ever knocked anyone's rocket down, or hit someone in the eye, but they did have a point. Floating head piston are still allowed in NAR competiton and are definitely way easier to set up than fixed heads. |
#12
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Now that we are all more familiar with the geography of the country, where in Ukraine was that? Hope they can return to something as insignificant as a model rocket competition... Bill
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It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
#13
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Lviv in extreme western Ukraine.
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them. |
#14
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Thank you very much Gus.
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them. |
#15
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Bill, The contest was originally scheduled to be held in Dnipropetrovsk, now known as Dnipro, in 2016. Dnipro is only about 80 miles from where the invasion took place in the Donbass region in 2014, and there was still recurrent fighting in that area. So the contest was moved to the far west of the country, near Lviv. Even so, a number of U.S. competitors chose not to go. After the contest my daughter Emma and I were offered the once-in-a-lifetime opportunity to accompany Matt Steele on a visit to the Youzhnoye / Youzhmash rocket design and manufacturing facility in Dnipro. This facility is better known to most of us in the west as the Yangel Design Bureau, where the Missiles of October and current Russian Satan missiles were built. Youzhnoye had a new project in mind and the director wanted to discuss it with Matt, with whom they worked in an earlier joint project to dismantle Russian nuclear missiles. Until about 10 years before we went Dnipro had been a closed city, off limits to foreigners due to the nature of the work done there. And at the time we went, due to the nearby fighting, it was not the safest place to go. But it was worth the risk. The facility was truly mind-boggling. We were also given a private tour of the city's incredible rocketry museum, and were treated to one of the most fantastic dinners we've ever eaten at a truly beautiful outdoor Yurt next to the Dnipro river. Of note, in our visit to Dnipro our hosts walked us by a large rocket display in the downtown area. That display was right across from the very large memorial to local residents killed in the defense of the Donbass two years before. The memorial was a lengthy wall along the city square with photos of those lost in the fighting. Our hearts are truly broken at what is happening in Ukraine. Slava Ukraini |
#16
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Got any pics or diagrams?
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them. |
#17
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Everyone flying NRC in our club uses floating head pistons. They usually fly 20-30' in the air if friction is right. They're harmless when falling down, we all use 34" lengths of standard BT-5, or sometimes more. It's silly they were banned - if they're banned for NRC, I may stop flying NRC. They provide tremendous performance improvement for 13mm motors - less so for 18mm motors.
We found using Quest B4 and B6 motors in pistons worked poorly for egg lofters - they had to be held incredibly tight, usually with a zip tie, and the thrust profile didn't get them up to speed nearly as fast as the Estes B6. This suggest the early spike of the BP motors is important when using pistons.
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Paul If we weren't all crazy, we would go insane - Jimmy Buffett NAR #87246 www.wooshrocketry.org |
#18
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And....well with a heavy payload (the egg) a good thrust spike, piston or no piston, is important. The Q-Jet Bs just aren't the right motor for that application. The Cs are a different story.
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#19
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Amen to that. Thanks for the writeup. Bill
__________________
It is well past time to Drill, Baby, Drill! If your June, July, August and September was like this, you might just hate summer too... Please unload your question before you ask it unless you have a concealed harry permit. : countdown begin cr dup . 1- ?dup 0= until cr ." Launch!" cr ; Give a man a rocket and he will fly for a day; teach him to build and he will spend the rest of his days sanding... |
#20
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We have been entirely clear that the only motors allowed for use at the World Championships next year will be NAR certified motors from Estes and Aerotech. Additionally, those motors will be provided by the organizers. |
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