#151  
Old 01-21-2019, 10:01 PM
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davetherocketguy davetherocketguy is offline
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Way too cold to be doing recovery tests outside so go some indoor work done tonight. I even got a putting test done on v 2.0:



Probably going to get some of the miles and miles of cat5 cable stripped up and run a length of the pairs between the spokes so the putters don't fall out the bottom like that one did. Why cat5? 'Cause I got a BUNCH of it years ago for free so I might as well use it...
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  #152  
Old 01-23-2019, 06:12 PM
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ericb45696 ericb45696 is offline
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McGruber!!!!!!!!

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  #153  
Old 01-25-2019, 09:24 AM
d11rok d11rok is offline
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Dave, great first launch. Any thoughts on using a slow I-power motor next launch? Haven't done the math, but it looked like you had enough inital power but not enough lasting power against the likely high drag.

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  #154  
Old 01-25-2019, 10:17 AM
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davetherocketguy davetherocketguy is offline
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Quote:
Originally Posted by d11rok View Post
Dave, great first launch. Any thoughts on using a slow I-power motor next launch? Haven't done the math, but it looked like you had enough inital power but not enough lasting power against the likely high drag.
Heeeeeyyyy someone that speaks my language lol. You are absolutely correct in your assessment and great question by the way.

I have a AT I140 (single use) in stock at the moment which was intended for another rocket but has since been designated for this one. I have higher thrust I motors (I245 - I think?) that are good for the other rocket but probably not so good for this one. I haven't done a final weight just yet because with the addition of the ebay and chute tube on top the weight is obviously going to be more - just don't know how much yet. Going to be a long indoor weekend here in Michigan so this is going to be a good time to get it finished. Once I know the dry weight then I can figure out what motor I want.

-Dave

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  #155  
Old 01-25-2019, 10:50 AM
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davetherocketguy davetherocketguy is offline
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And I might switch up motors anyways. For reference, here is the H100 it originally flew on:

http://www.thrustcurve.org/simfilesearch.jsp?id=2132

This is the I140:

http://www.thrustcurve.org/simfilesearch.jsp?id=2018

Is that enough? 336 NS vs. 200 NS is a 168% increase in thrust - so maybe? Another appealing option is a Loki I210 - which ships hazmat free by the way:

http://www.thrustcurve.org/simfilesearch.jsp?id=1497

Thats 490 NS and is a 245% increase over the H100 and might be a bit much. I mean, it'd be kinda funny to watch it shred as it ascends and see bits of chain and oak dowels come flying off but I'd kinda like it to work - at least once. Yeah, I need to crunch some numbers and think about this for a bit...Since this thing is sooooo draggy I have no idea what numbers to crunch lol.
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  #156  
Old 01-25-2019, 11:17 AM
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Noill Noill is offline
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well hell, we learned in the movie Contact to always build two...

Lol

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  #157  
Old 01-25-2019, 11:18 AM
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davetherocketguy davetherocketguy is offline
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Originally Posted by Noill Golf View Post
well hell, we learned in the movie Contact to always build two...

Lol
Well shoot someone earlier suggested I build 9 and launch all of them at once then list it here as a temp course.

-Dave

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  #158  
Old 01-25-2019, 11:26 AM
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brutalbrutus brutalbrutus is offline
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Just think of all the fun Steve would have trying to graph out the pars.

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Old 01-25-2019, 11:43 AM
Tjamesd Tjamesd is offline
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This is awesome, keep the updates coming.

Reading through this thread has re-ignited my childhood interest in model rocketry. Made me remember how much I enjoyed doing this with my dad, and I think I'm going to get back into it with my oldest kiddo! #GrowTheHobby

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  #160  
Old 01-25-2019, 12:30 PM
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davetherocketguy davetherocketguy is offline
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Quote:
Originally Posted by brutalbrutus View Post
Just think of all the fun Steve would have trying to graph out the pars.


Quote:
Originally Posted by Tjamesd View Post
This is awesome, keep the updates coming.

Reading through this thread has re-ignited my childhood interest in model rocketry. Made me remember how much I enjoyed doing this with my dad, and I think I'm going to get back into it with my oldest kiddo! #GrowTheHobby
AWESOME!!! Such a great hobby to do with kids for so many reasons. They learn basic scientific principles without even knowing it. Thanks so much for posting this. It means a lot to me.

Had a bit of an epiphany while eating lunch believe it or not. Trying to think how I could fool my OpenRocket program into accurately simulating the FBD&D...I'll just over-ride the mass of an existing simulation and then make the body tube so big and draggy that it matches the flight profile of the video I posted earlier. So based on that vid I think the flight time from ignition to apogee is roughly 4 seconds - or a little less. With OpenRocket I am gaining a little over 80 feet of altitude going from the H100 (211' -> 300') to the I140 and if I use the Loki I210 I gain about 180' over the H100. And that's adjusting for the new weight as well which I think will be around 6 pounds without motor. Having a sim (even inspite of its inaccuracies) is a huge step in this project in determining my timer set up and which motor I use. It'll at least get me in the ball park.

-Dave

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