dr wogz
Fly caster
Going for that 80's look, eh!
Going for that 80's look, eh!
Hmmmmmm,Naaah...If we're going for 80's look it would be painted entirely black with flourescent paint randomly splattered all over it. Then the word "GOBLIN" put on it in some weird cursive font.
Hmmmmmm,
I've been pondering a paint scheme for my LOC Goblin....
I had the same concern. I did mine the traditional way: leave off the rear CR until the very end. allows you to do internal fillets too.. Just make sure the upper CR s aligned with the fin slot!Hello all. I got a Loc Goblin (and one from Estes) a few days ago. The Estes one was one of my first 5 rockets built way back in the pre high school dark ages.
I've started building my big one, but have a question for you guys. If you are building your fin can outside the rocket, how are you making sure your fins are aligned straight? Yes, I know how the interlocking rings work, but on mine, I can move the top ring quite a lot independently of the bottom ring, resulting in fins that are not in line with the motor mount/body tube. Here's a photo of how I made some alignment markings using the slots in the bottom ring and a length of aluminum angle:
Now, that said. When I built my fin can, I glued the aft ring on and left the middle ring free.
Then, I used clamps to get everything aligned and also marked each fins position on the tube prior to applying glue.
Then pulled each fin out, applied glue, then stuck it back in place and tightened down the clamp.
Let 'em cure for a couple days then put the fillets in...still have not glued the middle CR in place yet...
Once it all looked good, then I glued the middle CR in place and filleted it all in.
That's a good idea using those clamps. I may have to pick up a set, since the ones I have are not long enough.
Also, am I the only one who thinks these fins are insanely heavy? Rocksim says only .71 caliber stability with a single grain 54mm motor (cti I150).
Is there a recommended or viable way to lighten the fin? Nose weight could always be added, but seems like defeating the purpose of using a big motor.
Now, that said. When I built my fin can, I glued the aft ring on and left the middle ring free.
Then, I used clamps to get everything aligned and also marked each fins position on the tube prior to applying glue.
Then pulled each fin out, applied glue, then stuck it back in place and tightened down the clamp.
Let 'em cure for a couple days then put the fillets in...still have not glued the middle CR in place yet...
Once it all looked good, then I glued the middle CR in place and filleted it all in.
What did you use to cover the fins? They look great.
^Bingo!Aeropack 54mm retainer and then use aeropack adapters for 38mm and 29mm motors.
+2..Aeropack 54mm retainer and then use aeropack adapters for 38mm and 29mm motors.
As far as fin alignment goes I noticed the same thing the fins were actually crooked in relation to the bodytube when setting in the centering rings. Looks like yall got it figured out, I did the same thing....made lines on the MMT and glued up the fins one at a time.
I took some picture of the misalignment but didn't post them on my build thread.
I used an engineers scale to set a parallel line on the motor tube and then glued my first fin with that along with the aft CR.
I then used the forward CR to align the next fins (glued one at a time), and then finally glued on the mid CR.
Man, Yalls rockets are looking GREAT!!
I'm still priming and have a whole lot of sanding to do before I can even get color on mine!!!
AWESOME!!!
I used my mark one eyeball to line my fins up. Looks straight to me. I'm finished with the fin can and I'll be gluing it into the body tube today.[b/]
I came across the instructions for the Goblin (cleaning up my messy bench! ) and I noticed something, I thought odd:
The CP is at 35.5" ±05". Why the tolerance on the CP? And why so big?!
My build has sufficiently stalled until I figure out the paint situation. I have an idea but need to get the base white down first and it's been too windy to do that. The more time I put into this rocket, the more excited I am getting to see it in the air.
Jonathan, thanks for catching my typo.I just looked at the PDF on LOC's site, and itss +/- .5" (1/2"), not 5". The decimal might be hard to see on the printed sheet they sent with the kits.
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