#21
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Thats an interesting idea. I'll have to look into that possibility! John -- John Dyer |
#22
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That's a nice looking model, John! I think the jet engines are what make it. Btw, I met you at NARCON too, although I didn't actually introduce myself. Here's a picture of Jay Goemmer and me (on the left) from another thread here: http://forums.rocketshoppe.com/show...p=6559#post6559
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John Thro, NAR #84553 SR I was too old when I started! Now I'll *never* become a BAR! |
#23
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John,
welcome to YORF! It was nice meeting you and seeing your display at NARCON. I was there with my little ones and gave the presentation on PowerPoint. As per your comment of keeping me away if I had a ruler and a camera, I wasn't kidding about not needing the ruler.... Anyways, I was also very intrigued by your design here. I have 2 questions; 1. Is that a string running along the body for a horizontal descent, ala Centuri SuperKits? 2. Speaking of Centuri, is that a cloned Raven/USS America nose cone up front I see? Once again, welcome. Later, EV |
#24
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Yes, I remember you. It was great meeting you! Thanks for the compliments. I hoipe to see you again soon - Perhaps at NSL, or NARAM???? John |
#25
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Thanks! Yes, thats a string or "lanyard" to help the model land flat. I have to figure out a better attach point at the rear - I have it looped around the motor clip. That sort of works, but I wouldn't want to sell a kit where the motor could pop out after ejection and the parachute opens. The model is BT-50. I currently have a paper cockpit on top, so I can see the resemblence to the Rave/USS America. I've been trying to decide if a paper cockpit will work ok, or if I should go just with a decal for the cockpit. John --- John Dyer www.redriverrocketry.com |
#26
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Fins go on tonight, paint and decals tomorrow, then hopefully the weather will cooperate and I'll get to fly this on Sunday. From a weather standpoint, tomorrow looks hideous. Rain and snow mix with wind and temps around 40. Sunday should only be slightly warmer, but partly sunny. I'd post some pics, but when I went to take them, my camera batteries were dead. Those rechargable batteries aren't what they're cracked up to be, but I guess they've saved me a few bucks in the last year. I'll get pics tomorrow.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
#27
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As promised, some pics. I made my first post-fire foray to VOA today. It was CO-OLD and occasionally windy, but the flying made the trip worthwhile. I made three flights with the RRR Starliner DST. I started with an A8-3, a great small field choice. Perfect flight and recovery, so I stepped up to a B6-4 on the next flight.
This time the flight was okay, but the Mylar parachute failed to open on recovery. It hit tail first on the gravel, and I was sure there would be some damage, but to my surprise, even the shroud was fine. This did nothing to change my mind about Mylar. Hate it. For the third flight I went with the C6-5, and the flight was quite a shock. It was never stable from the time it left the rod. It turned three or four complete loops before crashing hard into the ground in front of a group of panicked kids. It smoked through the coast phase, then fired its ejection charge. Expecting the worst, I approached the crash site, only to find everything still flightworthy. No damage at all. I can only guess that the added weight of the C6-5 was too much for the limited fin area. The kit card shows the C6-5 as a recommended motor, but I'd be hard pressed to go above a B again.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
#28
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Bill, Can you confirm some dimensions? From the photo, I'm guessing this is a BT-50/BNC-50X design, about 17" long, with a 2" tailcone 2" long. I whipped up a RKT file based on those dimensions, and fudged the fins to look close. That design should be stable with the C6-5, with a margin of 1.66. RocSim says such a design only needs about 22" of launch rod, and should have reached 1020'. Perhaps the second flight weakened the shroud more than you realized. There might be a soft area where it hit, and that might have collapsed during the "C" flight, destabilizing the model. See if the attached file is ballpark-close to the actual model... BTW... Optimum "B" motor is actually the B4-4, not the B6-4. You'd get about 5 extra feet of altitude, and a Dv of 7 FPS (9 FPS with the B6...).
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 Last edited by CPMcGraw : 03-26-2006 at 10:08 PM. |
#29
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17" seems a little long. Otherwise it's pretty close. I'll check the Red River site to see if they have the length listed.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
#30
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15" is the actual size. I'll check the shroud when I get home in the morning, but I checked it pretty closely at the field. it was treated with thin CA, so it was fairly rigid.
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Bill Eichelberger NAR 79563 http://wallyum.blogspot.com/ I miss being SAM 0058 Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper |
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