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  #1  
Old 04-27-2009, 07:27 PM
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CoachJT CoachJT is offline
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Default New Design: Drakh Raider

This is still a work in progress, but it looks promising
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  #2  
Old 04-27-2009, 07:30 PM
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Quote:
Originally Posted by CoachJT
This is still a work in progress, but it looks promising


Is this being done with RockSim? What are your simulation runs showing?

Wild design!
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  #3  
Old 04-27-2009, 07:40 PM
James Pierson James Pierson is offline
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Thumbs up Cool!

Looking forward to this one CoachJT.

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Old 04-27-2009, 07:52 PM
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Default New Design: Drakh Raider

Thanks everyone for the compliments.

I originally did it in Rocksim v8, then updated it in v9. I love the pod feature

Here is some of the flight data.

Wind speed model: Slightly breezy (8-14 MPH)
Low wind speed: 8.0000 MPH
High wind speed: 14.9000 MPH

Launch guide length: 36.0000 In.
Velocity at launch guide departure: 46.9705 ft/s
The launch guide was cleared at : 0.233 Seconds
User specified minimum velocity for stable flight: 43.9993 ft/s
Minimum velocity for stable flight reached at: 33.4321 In.

Using a delay time of : 7.000 Seconds
Velocity: 56.6158 ft/s
Altitude: 882.89042 Ft.

P: Parachute Deployed at : 8.651 Seconds
Velocity at deployment: 56.6158 ft/s
Altitude at deployment: 882.89042 Ft.

The deployment speed is obviously way too fast, and I think I need a longer launch rod. I'm going to keep working on this one though.
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Old 04-27-2009, 08:13 PM
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What engine did you select?

On your deployment, is the parachute showing an "ascending" or "descending" arrow?
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Old 04-27-2009, 08:13 PM
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What motor?

And I find it hard to believe that those looooooooong forward-swept fins won't flutter at least a bit.
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Old 04-27-2009, 08:17 PM
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Good point, John. Although being a work-in-progress, that might be correctable with a stiffener or two. Like the spar of a wing, running the long dimension. A CF "I" beam, with the balsa fitted in the channels, might be enough.
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  #8  
Old 04-27-2009, 08:28 PM
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Default New Design: Drakh Raider

I was using n Estes d-12. I definately needed a longer rod. Much better performance after I went to a 48 in. rod.

I too thought about those fins flapping back and forth like a card in bicycle spokes. Without some sort of reinforcement, those things would snap like a twig.

Here is the file if anyone wants to play.

JT
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Last edited by CoachJT : 04-28-2009 at 01:26 PM.
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  #9  
Old 05-03-2009, 02:06 AM
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Wink Variations on a theme

Quote:
Originally Posted by CoachJT
I too thought about those fins flapping back and forth like a card in bicycle spokes. Without some sort of reinforcement, those things would snap like a twig.
Yours is more faithful (and therefore *much* cooler looking!) than the whack I took at this design:

http://www.oldrocketforum.com/showp...3&postcount=180


I theorized that the fins could be made of a couple of criss-crossed 1/16" balsa. That basic idea might work for you (although you're doing 24mm instead of 18mm like I did).


Cheers,
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  #10  
Old 05-03-2009, 04:21 AM
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I think the 'safe' thing to do is put clear plastic centers in the fins.
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