Just traded PM's with Craig McGraw (the guy who did the fin template in the plans.rocketshoppe.com file).

He pointed out that the Marauder's fins are the same as the Estes Cyclone 1907 kit. He tossed in a link to the fin template (fins still in the extra balsa). I checked the scans of the instructions (Cyclone (1907), Marauder (1922) and confirmed that they do have the same part number. So, when I get home, I'll be running the numbers and updating my .ork file accordingly.

Again, according to the instructions, the Marauder's LL standoffs are 1/4" high, 7/8" at the root, and 5/8" at the tip (and cut from the scraps of the die-cut balsa sheet). The Cyclone doesn't have/need standoffs.

Thanks for the additional info Craig!

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Dreaming of making the rockets I dreamed of as a kid (and then some).

"The Guide says there is an art to flying", said Ford, "or rather a knack."
"The knack lies in learning how to throw yourself at the ground and miss."

Launching is Optional... Landing? That Depends on Trees.

Ok... Based on the image of the Cyclone (1907)'s fins (Estes PN 32607), I've found that the root edge is 1 3/8" long, and that the fin span is longest directly over the rear of the root edge. The measurements I took were from the image of the balsa and not the drawing next to it. The drawing DIDN'T bear out the relationship observed from the balsa right next to it.

Estes Cyclone (1907) &; Marauder (1922) Fin Pattern 90°


Estes Cyclone (1907) & Marauder (1922) Fin Pattern


My points plot out as:

X/Y

0/0
1.375" / 3.0625"
2.5" / 2.531"
1.375" / 0

Estes Marauder (1922) (Accurate Fins) UPDATED


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Attached Files

Estes Marauder (1922) (Accurate Fins) UPDATED.ork (3.2 KB, 14 views)

__________________
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.

Dreaming of making the rockets I dreamed of as a kid (and then some).

"The Guide says there is an art to flying", said Ford, "or rather a knack."
"The knack lies in learning how to throw yourself at the ground and miss."

Launching is Optional... Landing? That Depends on Trees.

Now you've gone and done it...

You made me DL the latest version of OR. It's been a long time since I've worked with either this or RockSim; RockSim was V9 and OR was something like V6. Now I've got to go through the whole process all over again...

Marauder was a favorite of mine, too. Built my first one (original kit version) with a 24mm engine mount 'cause... well... BOOSTAHS!

My second one has flown (clone version) but is still in need of a paint job. Maybe one day...

On both versions, though, I found that the fin-to-BT joint was a very weak connection on landing. A PK-12 isn't quite enough to touch down safely; A PK-16 or PK-18 would be better, but that means reducing the power to keep it in the field.

ADDENDUM: You might opt for a pair of PK-12s instead of a PK-16 or PK-18...

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

Please don't hate me... I found I flubbed on one of the "fins"... The one I use to sim the Engine hook with. AAAAAARRRRRRGGGGG!!!!! (Joking)

Nice thing is though, I don't have to cut that one out of balsa stock.

The other option you have is to build it as a 24mm powered rocket, and an adapter for an 18mm motor, and then just use the motor that's right for the field.
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__________________
.
.

Dreaming of making the rockets I dreamed of as a kid (and then some).

"The Guide says there is an art to flying", said Ford, "or rather a knack."
"The knack lies in learning how to throw yourself at the ground and miss."

Launching is Optional... Landing? That Depends on Trees.