Ye Olde Rocket Forum - More designs

Ye Olde Rocket Forum (http://www.oldrocketforum.com/index.php)

- Projects (http://www.oldrocketforum.com/forumdisplay.php?f=17)

- - More designs (http://www.oldrocketforum.com/showthread.php?t=11479)

Quote:

Originally Posted by Brain

Tell ya what: Do that and you'll be grandfathered in as the first SKY AYE board member (or something... fan club president???). Hopefully you'll provide some 'R' to some of my 'D'... and keep me posted, if possible (thread builds, pics, video of launches, barrage of opinions... all good). I want to know what dimensions of and what materials you use, too. Thank you.

Oh, and don't forget to look at the new design - the Bulldog 24-D. You can prolly guess the inspiration for this one... :rolleyes:

Brian,

If you are interested in seeing some of these designs become realities, I suspect you will need to also republish some of these pictures without perspective - that is, a simple flat plane like you did for me and the Intimidator design. Gordy will need these in order to derive true length, nose, and fin shapes.

Quote:

Originally Posted by LW Bercini

Brian,

If you are interested in seeing some of these designs become realities, I suspect you will need to also republish some of these pictures without perspective - that is, a simple flat plain like you did for me and the Intimidator design. Gordy will need these in order to derive true length, nose, and fin shapes.

I thought this would come up, and I will do that.

Quote:

Originally Posted by Brain

Oh, and don't forget to look at the new design - the Bulldog 24-D. You can prolly guess the inspiration for this one... :rolleyes:

Hey, Brain...

I don't know what your final design specs are supposed to be for this one, but here's a QnD RockSim of the Bulldog. I used ST-20 for the main body size, but I don't make any promises the NC or TC are exactly spot-on. The fins are eyeball-calibrated, but I'm near-sighted... :D

Length: 20.25"
Diameter: 2.04" (ST-20)
Fin Span: 7.74"
Weight: 4.57 oz

D12-3......366'......Dv 7 FPS....48" x 3/16" rod required
E28-4......632'......Dv 18 FPS
F39-3......727'......Dv 17 FPS

All-in-all, not bad performance for a RT design. YMMV, of course...

Hope this helps!

Quote:

Originally Posted by CPMcGraw

Indeed it does... but let me throw a twist at you: in the original design each of the main fins coming off the fuselage is double (two of them side-by-side - with enough space in between for each of the three conduits that run up the side of the fuselage) until they meet the ring, then there's one fin on the outside. Let's see what RockSim does with that!

I need to get RockSim someday... over the rainbow... :p

Nonetheless, what you have shown and told me is gratifying and way cool. I saw this one as being a big 'D-and-up' bird myself, so I must have got my point across with just that pic! Sweet!

Here are few of those orthographic renderings I do have... thank you all very much! :)

Quote:

Originally Posted by brain

...let me throw a twist at you: in the original design each of the main fins coming off the fuselage is double (two of them side-by-side - with enough space in between for each of the three conduits that run up the side of the fuselage) until they meet the ring, then there's one fin on the outside. Let's see what RockSim does with that!

So that's what that was! I noticed something odd about the fins in the image you posted, but interpreted it differently.

I'll run this through RS and post something shortly!

Bulldog 24-D Mk II

OK, Brain, here is a revised version with your doubled fins...

Length: 20.50"
Diameter: 2.04" (ST-20)
Fin Span: 7.00"
Weight: 4.54 oz

D12-3......382'......Dv 5 FPS......Requires a 48" x 3/16" rod
E28-4......655'......Dv 14 FPS
F39-3......751'......Dv 21 FPS

I slimmed the main fins down to 1/16" balsa, since they're doubled. The outer tip fins are 3/32" balsa.

The conduit is a 1/8" sq strip of balsa for the RS plan. You could probably substitute 1/8" spruce dowel stock without hurting the performance.

Quote:

Originally Posted by CPMcGraw

Then this puts it on the fast track. This is really neat to see, thank you! I'm glad someone is taking the time to hook some of these up in RockSim... it's a great tool (when I played with the demo version I spent more time figuring out the design tools and not-so-much on the launching tools). Another set of othographic views is below.

Another orthographic fix...