Lakeroadster's Warhawk

lakeroadster

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Updated Sim... Looks like an E30 will be a good candidate for this one to ensure adequate off rod speed. Maybe an E-20, depends on final as built weight.
2022-09-18 Open Rocket Simulation Warhawk BT-300.jpg
 
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MadRocketer

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I am super interested in the rear ejection. I have yet to build something like that. Two questions:

1). How will you arrange the parachute and cord? Either side of the engine mount? Spooled around? Something else?

2). Since there is close to no volume for the gas to expand, will the ejection be extra energetic calling for a super long shock cord?

Bonus question. What are the chances the recovery spool will exit at an angle and possibly complicate things?

( Parachute gets pinched maybe? Probably nil, but anything is possible.)
 

lakeroadster

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I am super interested in the rear ejection. I have yet to build something like that. Two questions:

1). How will you arrange the parachute and cord? Either side of the engine mount? Spooled around? Something else?

2). Since there is close to no volume for the gas to expand, will the ejection be extra energetic calling for a super long shock cord?

Bonus question. What are the chances the recovery spool will exit at an angle and possibly complicate things?

( Parachute gets pinched maybe? Probably nil, but anything is possible.)
1) The chute doesn't wrap entirely around the spool. It wraps until it touches itself, then doubles back on itself.​
2) A BT-300 is a pretty large body tube for a 24mm motor. I used this same arrangement on my Red Columbine and it flew and recovered without incident.​
3) The front upper centering ring is smaller to prevent binding. I wrap crepe paper around that upper ring to help protect the parachute from flaming hot bits.​

Avatar.JPG 002.JPG

Red Columbine Dwg Sheet 9 of 10 Rev 02.jpg
 

lakeroadster

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Nose Cone Coating and Attachment to Fuselage

Now that the rocket successfully passed the swing test, I can complete gluing it together and begin finishing / painting it.​
I coated the inside surfaces of the redwood nose cone with a combination of Gorilla Wood Glue and Titebond Quick and Thick. The motor ejection charge impinges directly on this surface.​

001.JPG 002.JPG
 
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lakeroadster

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Air Intake & Exhaust Headers

A few little detail items.​
Air Intake​
Made from a 1/2" dowel, sanded to suit.​
Exhaust Headers​
@Sandy H. suggested making some headers that protrude out... rather than a flat decal. Great Idea.​
3/16" dowels should work. After the glue dries I'll sand the sub-assy's. to length with my benchtop disc sander.​

Also updated the Open Rocket As-Built simulation​

001.JPG 002.JPG 003.JPG Fire Shark.jpg 2020-09-23 Open Rocket Simulation Warhawk BT-300.jpg
 
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lakeroadster

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Exhaust Headers Day 02 - CWF

Sanded the headers to length, sanded the glassine off the body tube and wood glued the headers to the body tube.

001.JPG

002.JPG 003.JPG
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CWF... Day 01

001.JPG
 
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lakeroadster

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Sanding the CWF

The Elmer's CWF I'm using I bought in May of 2018. This stuff is amazing. I store it in a ziplock bag, with a damp paper towel. Each time I use it I just add a little water in the corner of the container (or take some of the CWF paste out and put it in a yogurt cup and add some water). Then I throw out the old paper towel, put in a new damp paper towel, and stow it away.

I used 220 grit, then 400 grit, to sand down the CWF. Tomorrow... It's primer time. Stop! You can't paint this! (yet)

004.JPG
 

lakeroadster

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That’s going to be a fine looking model! Will we see hand painted chrome headers?

Thanks, fellow woodsman.​
Hand painted, yes. Chrome, no.​
I'm wanting to do a weathered paint job, with carbon trails off the headers and machine guns. Sure, it's an oddroc, but I've always been a fan of patina.​
 

techrat

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I was gonna joke that the planes get dinged up after their first transport flight because (lady pilots); but I have to admit that most of those WASPs were damn good and had more air-hours than their male counterparts!
 

lakeroadster

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Got my Apogee Components order today, and I just ordered the parts 2 days ago.

I'm tired of recovery harness failures on my LPR / MPR's.. so I'm stepping up to 300# Braided Kevlar.

And I'm oh so looking forward to flying the Warhawk on the E-20 white lighting motors.

The fin alignment fixture was free by using Coupon Code NL24JIG

2022-09-29 As Received.JPG
 
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Rob Campbell

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How about one of these Warhawks? Lends itself to a 2 motor cluster.
 

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