What did you do rocket wise today?

[teepot]

Today I installed the fins on the current project I cut out and filled and sanded yesterday. Tacked them in place with JB Kwik Weld. Masked and then did the fillets. Did all eight at once. I drew a fin pattern on some graph paper, cut them out and temporarily glued them to a sheet of 1/8th ply. I'm using 1/8th instead of my usual 1/4 ply because the fins are going to be big. That's for the next project. I have a lot of irons in the fire.

 

[Hobie1dog]

I got the KAM 3D rocket entered into the OR program. I had to take the dimensions and reduce them 17% so that the main airframe went from 4.8" down to a 4"

 

[Charles_McG]

Penultimate step of the Black Brant repair.

 

[twoxsheds]

I’m repairing a Thor that ejected prematurely. Trying to get ready for Sodblaster.

 

[Hobie1dog]

Sanded fillets on seven fins

 

[jqavins]

Is that two rockets or one?

 

[Hobie1dog]

Is that two rockets or one?

I knew somebody was going to ask that 3fins on the 40 year old 4" tube rocket and the Fat Boy has 4 fins ( I don't like 3 finned rockets).

 

[OzHybrid]

I knew somebody was going to ask that 3fins on the 40 year old 4" tube rocket and the Fat Boy has 4 fins ( I don't like 3 finned rockets).

Not this then...

 

[Tech 68]

Struggled with trying to modify my Level 3 M1830 RasAero file for an AeroTech K1800ST.
Finally gave up... changed the RockSim to the K1800ST, and imported it into RasAero. Gave me ~2400 Ft apogee, which is perfect for our small field.

 

[Hobie1dog]

Not this then... View attachment 595010

I'm in love and with that fin design, no fillets to sand.

 

[OzHybrid]

Struggled with trying to modify my Level 3 M1830 RasAero file for an AeroTech K1800ST.
Finally gave up... changed the RockSim to the K1800ST, and imported it into RasAero. Gave me ~2400 Ft apogee, which is perfect for our small field.

RasAero is great for flights that transition into Mach and above. Your L3 flight would have been. Are you into the Mach transition region for this flight? If not, I wouldn't use it for subsonic as it doesn't really provide any additional information for that region of the flight envelope.
What altitude did RockSim or OR give?
Norm

 

[OzHybrid]

I'm in love and with that fin design, no fillets to sand.

Have you got access to a printer? Do you need me to print one for you?

 

[Hobie1dog]

Have you got access to a printer? Do you need me to print one for you?

My rocket buddy does all my printing for me as he's a retired plastics engineer, so I guess I just need the file for him. Thanks.

 

[OzHybrid]

My rocket buddy does all my printing for me as he's a retired plastics engineer, so I guess I just need the file for him. Thanks.

I'll PM you.

 

[Cape Byron]

Some success.

 

[bad_idea]

Not this then... View attachment 595010

OpenSCAD?

I'm in love and with that fin design, no fillets to sand.

I adopted (and heavily rebuilt) a pre-built Aerotech Mustang. Its plastic fins have built-in fillets like these. Since I don't know what was used to assemble the example I have, I'll probably apply tip-to-tip before I launch it on the I200 I stretched it to take. If I knew the fins had been applied with decent epoxy, I'd probably just send it.

 

[OzHybrid]

OpenSCAD?

Yes indeedy. https://www.rocketryforum.com/threads/norms-scad-file-repository-and-3d-printing.170781/ Multiple part designers in it. Bill Kalsow also had a good fin can designer with better fillets. But I like mine betterer....

 

[OzHybrid]

Some success.

View attachment 595025

I think I can see oil starting to leak onto your desk.........

 

[Pinetree]

Hopefully you won't be using Lucas electronics.

 

[Cape Byron]

Hopefully you won't be using Lucas electronics.

I'll have to make up some 'Replacement Smoke' bottles.

 

[bad_idea]

Hopefully you won't be using Lucas electronics.

Lucas, the Prince of Darkness?

As the wag goes, "Q: Why do the British prefer warm beer? A: They're used to Lucas refrigerators."

 

[WV8KE]

Mega Der Red Max launched on an Aerotech H130W

 

[teepot]

Today I started work on a new project. Cut the fins out yesterday and sanded them today. Installed motor mount with attached shock cord and rail buttons. Might get the fins on tonight. The current project is ready for primer. Considering it's only 85*F at 10:30 pm I will be putting the primer on it a little later. I also need to put another couple of coats on a past project. I ordered some vinyl from Stickershock for it Friday. I expect it early next week. Hurricane UT is about 2 hours from here.

 

[DabCat]

Launched Whistling Max again on a G53.View attachment 594854
Thanks to George Katz for the photo. Whistles on fin tips and nose.

Are those whistles 3d printed?

 

[OzHybrid]

Are those whistles 3d printed?

Yes. DO NOT SCALE. PRINT AT 0.1MM LAYER HEIGHT
Edit: files updated

 

[DerRedMax]

Began work on my first fiberglass rocket and a 54mm Av-Bay.

 

[Tech 68]

What altitude did RockSim or OR give?
Norm

RockSim gave me right around 2550 feet... and I'm way below mach.

 

[OKTurbo]

Some success.

View attachment 595025

Better start watching for oil leaks! I've never had a BSA, but I've owned a couple of Triumphs. T100R Daytona and a '72 Trident. The Trident was a "big" bike back in the day. The Daytona had an "auto" chain luber....basically a constant oil leak onto the chain.

 

[SolarYellow]

Launched Whistling Max again on a G53.View attachment 594854
Thanks to George Katz for the photo. Whistles on fin tips and nose.

It's all about the whoo-whooooooo!

 

[Hobie1dog]

spent an hour making changes on 2 different OR files, still learning