Another unnamed retro ship with a bunch of exhaust tubes.

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Pem Tech

Pem Tech

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Also built for the sheer giggles of it, is this little bugger, not to be vague but I haven't decided on a name yet. Your basic retro Sci-fi with curvy fins and lots of exhaust tubes. WHere it gets interesting is protecting the pointy fins
The solution, have the airframe separate just ahead of the fins allowing most of the mass to reside in the nose section.


EA6_0117x800.jpg


She is 21" overall, 2.6" in dimeter, powered by a 24mm motor mount and stabilized by four 1/16" pointy ply fins. Twelve short sections of BT-5 surround the central 24mm MM.

Don't pay to any attention to the fillets, they turned out pretty bad and the exhaust tubes are not even. But this was an assemblage of spare parts. flavored with odds and ends, so no big whoopey.



Build and flight pics to follow.
 
Pem Tech said:
Also built for the sheer giggles of it, is this little bugger, not to be vague but I haven't decided on a name yet.
Click to expand...
Ooo, I've got one - how about calling it the Patrol Cruiser Excalibur? :roll:

But seriously, it looks nice Layne. :)

MarkII
 
Layne, I'm going to offer a suggestion. I think the pointy ends of those fins are going to break alot even with plywood and a (lower) mid-body seperation point. To have those fin points come down gentle enought to avoid (most) breaks you would have to use a parachute so big that rocket will drift pretty far. If you not planning to kit this that's just going to affect you. If you do plan to kit it may I suggest that you make two models of this rocket on a smaller scale using thin balsa fins, model rocket tubing and nose cones. On one have it seperate in mid body like this one will do and the other try a rear ejected motor mount. Have a Kevlar string come out of the rear with the parachute and shock cord attached to it. I think that this will just about assure that the plastic NC on the actual kit will contact the ground first and the parachute can then gently allow the fins to contact the ground on a thicker, more robust part closer to the body tube and not the points.
 
RandyT0001 said:
Layne, I'm going to offer a suggestion. I think the pointy ends of those fins are going to break alot even with plywood and a (lower) mid-body seperation point. To have those fin points come down gentle enought to avoid (most) breaks you would have to use a parachute so big that rocket will drift pretty far. If you not planning to kit this that's just going to affect you. If you do plan to kit it may I suggest that you make two models of this rocket on a smaller scale using thin balsa fins, model rocket tubing and nose cones. On one have it seperate in mid body like this one will do and the other try a rear ejected motor mount. Have a Kevlar string come out of the rear with the parachute and shock cord attached to it. I think that this will just about assure that the plastic NC on the actual kit will contact the ground first and the parachute can then gently allow the fins to contact the ground on a thicker, more robust part closer to the body tube and not the points.
Click to expand...

Good idea....
 
Is tip breakage ever a problem with the pointy fins on either Bucky Jones version?

Hey, you could always tip them with brass.... :shock:







(OK, maybe not.) :duck:


MarkII
 
RandyT0001 said:
Layne, I'm going to offer a suggestion. I think the pointy ends of those fins are going to break alot even with plywood and a (lower) mid-body seperation point. To have those fin points come down gentle enought to avoid (most) breaks you would have to use a parachute so big that rocket will drift pretty far. If you not planning to kit this that's just going to affect you. If you do plan to kit it may I suggest that you make two models of this rocket on a smaller scale using thin balsa fins, model rocket tubing and nose cones. On one have it seperate in mid body like this one will do and the other try a rear ejected motor mount. Have a Kevlar string come out of the rear with the parachute and shock cord attached to it. I think that this will just about assure that the plastic NC on the actual kit will contact the ground first and the parachute can then gently allow the fins to contact the ground on a thicker, more robust part closer to the body tube and not the points.
Click to expand...


Mark hit the nail on the head. There has been no reported breakage problems with Little Bucky, and of the three I have built there has never been a broken tip. With this information I hazarded a guess at making the aft section light enough. The way the shock cords are arranged the NC lands first and the tail section is eased down as you suggested.
Thanks for the input, I may build different scales just for giggles as well.
 
That's cool.... looks like that rocket in the Wyle E. Coyote cartoon where he installs the world's largest electromagnet to catch Bugs Bunny after feeding him an iron carrot, and when he activates it all this stuff is pulled in, like the Eiffel Tower, satellites from orbit, a naval ship, and a rocket trying to lift off, which blows his cave sky high...

KUTGW!!! OL JR :)

https://en.wikipedia.org/wiki/Compressed_Hare

https://www.youtube.com/watch?v=U29Piu3bfe4
 
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very nice Layne, I like it a lot! needs a name like the Titan Express, or Martian Bullet, something that sounds fast.
 
Micromeister said:
But it looks almost EXACTLY like your unnamed rocket. a Patrol Curiser Excalibur by any other name should still fly so sweet..!!!LOL!!!
Click to expand...

Hmmmmmmm
That was unintentional....
The intent was to use what was on-hand: NC, laser cut fins, BT-80 ect.

Maybe this is design is a universal commonality?
:rolleyes:

Glad you guys like it...
 
Well, now that I look at it some more, I can see some differences. I think that your fin shape is somewhat different, and yours also doesn't have the cockpit.

And so what if the two are superficially similar? Your build and the PCE both draw their inspiration from the same sources, so they are bound to share some common elements. It's not like the Damon-era Estes Industries invented the 1940's-50's rocket ship, after all. All of these types of designs can trace their lineage back to the V-2. I don't hear WVB complaining.

And no matter how good it was, the Patrol Cruiser Excalibur kit just didn't have that certain Pem-Tech je ne sais quoi. ;) Or anything like the same quality. I'm sure that there would be a distinct difference in tone in the in(de)structions, for instance. :D

MarkII
 
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MarkII said:
And no matter how good it was, the Patrol Cruiser Excalibur kit just didn't have that Pem-Tech level of quality. I'm sure that there would be a distinct difference in tone in the in(de)structions, for instance. :D

MarkII
Click to expand...


Wow...
That is quite a compliment...
Thanks.
 
with tongue slightly in cheek...How about putting those micro-motors that I've heard about in the fake "engine tubes" for a little more thrust and a great-looking effect? I'm only half joking...
Grif
 
Grif Ingram said:
with tongue slightly in cheek...How about putting those micro-motors that I've heard about in the fake "engine tubes" for a little more thrust and a great-looking effect? I'm only half joking...
Grif
Click to expand...

MMX motors and supplies are on my Secret Santa wish list so be careful of what you ask for.
:dark:

ANd yes, the RAS is STILL in the works..
:neener:
 
ANd yes, the RAS is STILL in the works..
Click to expand...

I didn't say a word...:confused2:

But yeah, I bet it would be a real popular kit! And as for the micro-motors - why not? There've been a few rockets with multiple engine tubes, but none, AFAIK, with them functional!
Grif
 
Grif Ingram said:
I didn't say a word...:confused2:

But yeah, I bet it would be a real popular kit! And as for the micro-motors - why not? There've been a few rockets with multiple engine tubes, but none, AFAIK, with them functional!
Grif
Click to expand...

Just for our amusement I worked on an idea for a 2.6" diameter RAS with plastic Apogee NC and TC. 24mm MM in the first and second stages, 26' over all and weighs in at a bit over 10 ozs with D12's. Looks like 1200' on a D12 combo.

RAS%2026.jpg


What ya' think?
 
What ya' think?
Click to expand...

I think: OOOH! Gimme!

That would look great! Avoids the stability problem of the forward fins on the earlier version, too - and it'd be big enough for the "ladder and hatch" decal from the 3FNC!

Grif
 
I'm just curious what the parts are made of (only 10 oz) and how to tranport it to the launch zone. 26' (feet)!! WOW :eyepop:

I assume that is a typo and Layne means 26" (inches)

Looks cool! :clap:
 
les said:
I'm just curious what the parts are made of (only 10 oz) and how to tranport it to the launch zone. 26' (feet)!! WOW :eyepop:

I assume that is a typo and Layne means 26" (inches)

Looks cool! :clap:
Click to expand...


Yes, 26".......

:neener:
 

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