I posted this in The Rocketry forum and didn't get much of a response except from a fellow club member.

This is a kit bash of the Estes ATA Sentinal and the Archer/Arrow. Just wondering what you all think. The pic is of my upscale version of the ATA Sentinal.

http://www.rocketryforum.com/attach...92&d=1185656393

http://www.rocketryforum.com/attach...93&d=1185656393

http://www.rocketryforum.com/attach...94&d=1185656393

http://www.rocketryforum.com/attach...28&d=1187499748

Attached Files

sentinal.rkt (148.3 KB, 50 views)

The upscale visually looks good, but take note of the flight sim data in your RKT file; especially the Dv numbers in the chart (Velocity at Deployment), and the guide length numbers in each individual flight sim (double click the second entry for one that caught my attention). Dv numbers over about 30 FPS mean your parachute stands a greater chance of shredding in an explosive canopy opening.

That E16-4 motor requires a launch tower at least 120", or 10', tall just to get up to a safe flight speed. That's a lot of tower to haul around, and a simple rod just isn't sufficient. Some of the other sims show similar requirements. You need motors that get this rocket to flight-V in less than 40", so you can keep the launch requirements to a 48" x 3/16" rod. That means (probably) core-burning motors with high spikes and short burn times.

Play with RockSim a little more before trying to real-world flight test this model. You'll find the right combination of power / delay easily enough.

And keep posting your changes. That's how you get the feedback you need.

__________________
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

I had the plans for the ATA-31 (?) printed up, but decided to go with the Photon Disruptor instead. Now I wish I'd gone with my original plan. I've also got a 1:1 Sentinel that I cloned last year. Nice performer. Is yours a BT-60 or BT-80?

__________________
Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Centuri Mini Dactyl Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II, Xarconian Cruiser Semroc Cyber III

Ready to fly: Estes - Solar Sailer II Semroc - Earmark

Its a BT-80

here is my photon disruptor II upscaled to a BT-70 tube

http://www.rocketryforum.com/attach...43&d=1105575419