Bobby's OpenRocket Files with screenshots and plans

[bobby_hamill]

trying to get all OR files together

 

[bobby_hamill]

 

[neil_w]

How is this different from your other thread?

 

[bobby_hamill]

going to get the other thread deleted when done with this one

 

[bobby_hamill]

4 inch Estes Hercules

simulated 2 stage fin set as one fin

 

[bobby_hamill]

 

[bobby_hamill]

4 inch Payloader II Centuri SpecsPayloader 2 Centuri Specs

 

[bobby_hamill]

4 inch Payloader II Estes Specs

 

[bobby_hamill]

4 Inch FSI OSO Blue Bird

 

[bobby_hamill]

4 Inch FSI OSO Red

 

[bobby_hamill]

4 Inch FSI OSO Checker Board

 

[bobby_hamill]

4 inch 4 fin Black Brant II with Parachute Recovery Section and checker board roll pattern

 

[bobby_hamill]

4 inch 4 fin Black Brant II no Parachute Recovery Section and checker board roll pattern

 

[bobby_hamill]

4 inch 4 fin Black Brant II with Parachute Recovery Section solid black

 

[bobby_hamill]

4 inch 4 fin Black Brant II No Parachute Recovery Section solid black

 

[bobby_hamill]

Here are some of the steps I did to get upscale measurements of the 2 Payloader II
The Payloader II was first offered by Centuri then by Estes with some slight changes.
That is why I did an Centuri Specs and a Estes Specs of the Payloader II

Centuri First


Main airframe ST-1010 = 10.5 inches long
Clear Payload Tube CPT-102 = 2.5 inches long
Outside diameter of airframe = 1.040 inches
Find percent increase from 1.040 diameter to 4.024 diameter
Percent increase = 286.923 percent
286.923 percent of 10.5 = 30.12 inches for main body tube
286.923 percent of 2.5 = 7.17 inches for clear payload tube
So for a 4.024 up scale the
Main body tube = 30.12 inches
Clear payload tube = 7.17 inches

Now the Estes version
Main airframe 030456 ( BT-50A ) = 10 inches long
Clear Payload Tube 030608 ( PST-50S ) = 4 inches long
Outside diameter of airframe = 0.976
Find percent increase from 0.950 diameter to 4.024 diameter
Percent increase = 312.295 percent
312.295 percent of 10 inches = 31.22 inches for main body tube
312.295 percent of 4 inches = 12.49 inches for clear payload tube
So for a 4.024 up scale the
Main body tube = 31.22 inches
Clear payload tube = 12.49 inches

To be a stickler for details the outside diameter of the Centuri ST-1010 was 1.040
where as the Centuri CPT-102 had an outside diameter of 1.030

 

[bobby_hamill]

To get the image file correct for the checkerboard pattern on the fins the fin image used on the left side of the fin
was flipped horizontally before being used on the right side of the fin

 

[bobby_hamill]

A lot of the 4 fin Black Brant IIs did not use a "Blade" type antenna but the antenna ran parallel with the airframe
See photo attached below

 

[bjphoenix]

Here are some of the steps I did to get upscale measurements of the 2 Payloader II

How did you determine fin shape? Did you have a pattern from an original kit?

 

[bobby_hamill]

I used the images from part 4 and 5 of the fin build from the link below to get the original shape and measurements then upscale it using the
original Estes tube diameter as a starting point and the 4.024 diameter tube I wanted to upscale to as an ending point

forgot to add the "pumpkin" color is actually called Gloss Bauhaus Gold

https://modelrocketbuilding.blogspot.com/2015/02/estes-payloader-ii-3022-build-part-5.html

 

[Hobie1dog]

i'm highly envious of your skills

 

[John Kemker]

"What the hell, Bobby?!" -- H. Hill

 

[bobby_hamill]

H. Hill ????

There was an Error in the Katana ORG file and I could not delete the file without deleting all of the posts
made after wards, Plus I wanted to put all of my ORG files in one place to make it easier to find so this is
all of the eggs in one basket

 

[bobby_hamill]

Black Brant 2A with BAIL type fins scaled to 4.024 diameter tube

 

[bobby_hamill]

SparoAir 2 Aircraft launched Navy Sounding Rocket

 

[bobby_hamill]

The version I built used 2 fincans and a nosecone that were printed using PTEG by cwbullet.
Hats off to cwbullet for the excellent 3d print work ! I am building another version using the
BT60 and BT50 Fiberglas airframe from Mach 1 Rocketry. This will add rigidity to the airframe
for the added weight of the 3d printed fincans and nosecone

If you decide to go this route you will need a section of BT60 8 5/8 inches ling between the booster and
2nd stage fincans and another section 9 inches long between the 2nd stage fin can and nosecone. And the BT50 engine mount tube needs to be 16 inches long


The STL files for the 2 fincans and nosecone are attached below along with a photo of all 3 printed parts

 

[John Kemker]

H. Hill ????

Hank Hill, from King of the Hill

 

[bobby_hamill]

Hank Hill, from King of the Hill

LOL

 

[Hobie1dog]

The version I built used 2 fincans and a nosecone that were printed using PTEG by cwbullet.
Hats off to cwbullet for the excellent 3d print work !

Chuck is pretty good.