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On Jun 7, 2021, at 8:17 AM, Anthony Cooper <To...@coopers.org> wrote:
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So that solves the recovery wad problem. I also agree with Tony - invest in a decent, properly sized parachute.You also don’t specify your recovery harness. Keep in mind the wisdom of the late, great James Marino “elastic is to for your underwear and not your shock cord.” Get kevlar cord and ensure a fail-safe system. If you know a commercial electrician, it is often used as pull cord for electrical conduit - you may be able to get a couple of yards donated to your project.There may be a 29mm nose cone in the LUNAR donated parts box - another source for quality build materials on a budget. We recently had a ton of materials donated from a flyer who left the hobby.
On Jun 7, 2021, at 8:26 AM, Anthony Cooper <to...@coopers.org> wrote:
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What’s the point of the big body tube/”duct” hanging off of the back? You’ll want to Google the Krushnic Effect. The sim also doesn’t show how this tube is attached to the rocket.
Rob Heil
NAR: 31892
TRA: 17863
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Hi Stan,I looked over your .ork file. I think Rob's earlier comment about the "Krushnic Effect" is worth exploring. Perhaps you might first try flying it w/o the duct tube just to prove the model flight worthy, then add the duct tubing.Having said that, I also don't see the motor retainer in your design. Since it's a significant weight, be sure to add a weight object to represent it. Just a short piece of tubing with the appropriate weight override will work.Additionally, things like shock cords, screw eyes, etc., do add additional weight, and will affect your CG location. While trivial, they will make a difference, and in this design, especially with the tube so far behind the motor, balance may be very important.As for the "Krushnic Effect", the significant portion of that might be a reduced realized thrust. While the motor thrust won't change, the expansion of the gas flow (post nozzle) might be changed significantly. I'm not familiar, so for sure this would be a "heads up" flight the first time you have the duct attached. Still, with your selected motor, I'm certain it will get off the pad, just be sure to have it well above the blast plate to avoid any induced vacuum effect. Otherwise, for sure you'll burn a hole in the plate. Most of these simulators do a less than perfect job of simulating uncommon designs with tubes well behind the motor, so your design may need adjustments after you examine your first flight's data.Steve Kendall
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Steve
your eyes are as sharp as ever Allen Palmer
On Jun 7, 2021, at 1:52 PM, srkendal <srke...@comcast.net> wrote:
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Allen j Palmer
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Allen, Steve is actually a lumberjack and came to my place in Oregon to get wood and make some cabinets.
CW
From: lunar-...@googlegroups.com <lunar-...@googlegroups.com> on behalf of srkendal <srke...@comcast.net>
Sent: Monday, June 7, 2021 1:58 PM
To: lunar-general <lunar-...@googlegroups.com>
Subject: Re: [LUNAR general:] MPR G motor Rocket Part List Check
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