I scanned and redrew fin patterns for the Semroc Hydra VII. See attached. I have an original fin pattern sheet (FV-29) that I used for this little project.

I experience rescaling issues when I converted my Illustrator drawing to PDF format. I compensated, and at least on my printer, the drawings come out true to scale. Please print out the attached file, print it, and report back to this thread with comments.

Attached Files

Semroc Hydra VII fins.pdf (12.8 KB, 93 views)

__________________
-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President

Astronwolf, I printed out the attachment and it print precisely on the 1 inch scale as shown.
Thank you,
David

__________________
David Manning
SAM # 0455

How about including the tube lengths and Nose Cone length, so this may be properly cloned ?

All parts lengths and other measurements can be accessed on the Semroc site by typing the Part # in the box and clicking the view box. Part D, Part G and the decals are no longer available from Semroc. I have located a nosecone that is 1/2 inch longer and Balsa Tube coupler from another source. My Semroc order was shipped this morning for the available parts. I think the artwork for the decals can be accessed on the RocSim Software.

Parts List
A 2 Body Tubes ........................ ST-1690
B 7 Body Tubes ......................... ST-790
C 1 Body Tube ........................... ST-3630
D 1 Balsa Nose Cone ................. BC-1631
E 3 Balsa Nose Cones ............... BC-714
F 1 Laser Cut Fin Set ................. FV-29
G 1 Balsa Tube Coupler ............ BTC-16
H 1 Launch Lug ......................... LL-122
I 1 Screw Eye ............................ SE-10
J 2 Elastic Cord ........................ EC-124
K 1 Kevlar Thread..................... SCK-24
L 3 Plastic Parachutes ............. RC-12
M 3 Tape Discs ........................... TD-6
N 3 Shroud Lines ...................... SLT-6
O 1 Wood Dowel ....................... WD-39
P 7 Thrust Rings ....................... TR-7
Q 1 Plug Set ............................... IKV-29P
R 1 Decal ................................... DKV-29
S 1 Empty Casing ..................... MC-727
T 1 Glue Applicator .................. GA-1

__________________
David Manning
SAM # 0455

Eventually...

__________________
-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President

FYI - The SEMROC website's "functionality" is rapidly dwindling, many links are inactive or lead to missing files. If anyone is looking for any other info, I suggest making a "beeline" to the website, ASAP, before it's too late.

I got the tube lengths I needed . . . Barely !

Those who care about this kind of stuff have been diligent over at least the past 6 months already.

I have the part to build an exact clone of the Hydra VII, but I more inclined to develop a clone that others can build. Not having ST-16 tubing or that 3.6" diameter tail ring shouldn't be an obstacle for this crowd.

__________________
-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President

1690 = 9" long
790 = 9" long
3630 = 3.0" long
1631 = 3.1" long
714 = 1.4" long

There is no 30" long tube on the Hydra VII. The tail ring is 3.6" diameter and has a length of 3.0", hence the 3630 designation for that tube.

__________________
-Wolfram v. Kiparski
NAR 28643 - TRA 15520
MTMA Section #606 President

Thanks for the correction . . . I had a typo and left out the "." by mistake.

The correct length for the 3.6" diameter tube is 3.0".