Purple Parrot - MD 38mm

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SpaceManMat
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Re: Purple Parrot - MD 38mm

Postby SpaceManMat » Mon May 14, 2018 2:35 pm

crom wrote:Awesome stuff, congratulations Mat!

Do you think there would be any altitude difference between the using fly away rail guide or a tower??


Thanks Mat

I did some trial sims in OR which suggestted that the lost momentum in the fly away rails and drag cost 20 feet. However that assumed clean and immediate separation as It left the rails, as you can see from the photo it stayed on quite long. I think it is probably a minimum of 50 feet possibly up to 100. Of course if you do away with the fly away rails you then need to think about MD tower and does that cause addition friction? So that may offset the losses slightly, but I think a MD tower would have the advantage.

Got to do some work, will post altimiter data etc later.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

air.command
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Re: Purple Parrot - MD 38mm

Postby air.command » Mon May 14, 2018 3:19 pm

Wow that's awesome. 8) :shock: Congratulations on a great flight Mat. How did the performance compare to simulations?
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SpaceManMat
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Re: Purple Parrot - MD 38mm

Postby SpaceManMat » Mon May 14, 2018 3:42 pm

I forgot to mention the decent rate was 32 f/s the landing was about 2.3km from the launch site, so moving the launch site was definitely a good move. A number of guys had to trek 1 or 2 km to recover rockets in pretty muddy conditions glad I missed out on that one.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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SpaceManMat
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Re: Purple Parrot - MD 38mm

Postby SpaceManMat » Mon May 14, 2018 3:44 pm

air.command wrote:Wow that's awesome. 8) :shock: Congratulations on a great flight Mat. How did the performance compare to simulations?


Thanks.

OR was telling me 14,160 feet, so pretty close.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

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SpaceManMat
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Re: Purple Parrot - MD 38mm

Postby SpaceManMat » Mon May 14, 2018 4:18 pm

Raven flight data
Image
Purple Parrot I Motor Altitude Record

Close up of ascent, including really nice example of Mach transition in the baro data when dropping out of Mach.
Image
Purple Parrot I216 Ascent

OR flown configuration. Final weight was 1058g. In the end the stability ended up a bit larger than planned.
Image
Purple Parrot I216 Configuration

Raven summary. All good, nice to see that max G figure.
Image
Purple Parrot I Motor Altitude Record Summary

Went through the Raven data pretty good. Could not see any issues, voltage was good through out. Primary charge definitely kicked out the chute on queue, secondary charge went off a second later.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing


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