Loc Goblin Thread

My LOC 7.5 Goblin arrived the other day!


I love the custom two toned bat logo on the box!

I have 6 rockets that need to be finished before I start this beast.

Too cool.

I kinda have to laugh at these boxes.. it's a large box with hollow tubes inside! A lot of volume for little actual material.

Although the kits are cool, the box art is also pretty cool too!!

Brad, you put me to sham, I received my LOC 4" Goblin today and was excited but now I feel like I got a Mini Goblin, lol...

Okay, the tubular nylon shock cord connects to the eye bolt on the top centering ring and the other end to the nose cone and parachute. Won't the tubular nylon shock cord get singed by the ejection charge? I have a nomex blanket to wrap my chute, but what about protecting the shock cord?

just picked up a shock cord protector from Apogee. https://www.apogeerockets.com/index...ducts_id=258&zenid=hf77t4caraur6pp48mf48h8c94

JonathanOtt said:

Okay, the tubular nylon shock cord connects to the eye bolt on the top centering ring and the other end to the nose cone and parachute. Won't the tubular nylon shock cord get singed by the ejection charge?

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Yes, and that is why I always use a short section of Kevlar (1000-2000 LBF) from the eye bolt to just above the top of the body tube. In addition, I add a small (~3") piece of material on that Kevlar at the top (near the BT edge) for wear protection.

Just wondering how much nose weight was added for your LOC Goblin? Based on my RockSim model, I'm finding ~200g works for 38mm and 1-2 grain 54mm motors.

wighty44 said:

Just wondering how much nose weight was added for your LOC Goblin? Based on my RockSim model, I'm finding ~200g works for 38mm and 1-2 grain 54mm motors.

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I flew mine on a I245G using the LOC 38mm adapter with no nose weight. Then the LOC boys and I aired them out at Bong last weekend. I flew mine on a K456DM, and the LOC boys upped me a little by using a K535W DMS. Mine went to 3956', and the LOC boys got ~4100' ish. No epoxy in my rocket at all. I did shake the external fillets loose. It pulled almost 24 G's. I'm gonna pull them off and use TB III this time... I think the Mould and Trim didn't soak in good enough.

Change 1... I did find that nose weight will not be needed. The Rocket Nut (Prairie Twister Rocketry) I used to secure the SC to the NC added ~49g to the build weight. I'm not a fan of using that molded "loop" to fasten the SC to the NC - I've seen too many snap off.

I just picked up a Goblin from my local shop for a winter project. Looking forward to my first LOC build!

That interlocking fin can is awesome.

LOC said:

The Cletus fins are not quite to scale as the Goblin. But Thank You for fueling my ADD/OCD problem and now we may just have to re-brand the Big-C. Should we give it the same treatment we did to the 4"? 75/54/38 mm adaptor rings and loc-n-rings? We're all ears over here!!! LOL

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I know, I know, old thread, but yeah. Fill the gap between the 4" and the 7" with a Goblinized Big Cletus.

JonathanOtt said:

I know, I know, old thread, but yeah. Fill the gap between the 4" and the 7" with a Goblinized Big Cletus.

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I second that. A Goblin in 5.54" would be sweet. The 7.5 is too far out of my wheelhouse, at the moment, but a 5.5 would be doable. That being said, I'm eyeing the 7.5" Door Knob with interest. Good range of motor usage.

And then the rocket died...
I was sad. It was my go to flier. The chute didn't open. The JL CR was open at the scene of the crime, but the chute was still folded up. It broke right above the motor case. I used the HUGE AT54/426 case... I've flow the exact same combination before. Just that this time things went a little, well, off...
Oh well. Time to build a new one with the correct markings...

jd2cylman said:

And then the rocket died...
I was sad. It was my go to flier. The chute didn't open. The JL CR was open at the scene of the crime, but the chute was still folded up. It broke right above the motor case. I used the HUGE AT54/426 case... I've flow the exact same combination before. Just that this time things went a little, well, off...
Oh well. Time to build a new one with the correct markings...

View attachment 374806 View attachment 374807 View attachment 374808

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I feel your pain...

Was cold weather a factor?

JDcluster said:

Was cold weather a factor?

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Nothing works correctly in Wisconsin winters.... I'd gamble $20 the chute simply "stiffened" up and didn't want to open. Especially if it was packed in the airframe for a bit.

Might be able to salvage the fin can and just replace the tube. Slip a 38mm mount inside the old 54 use a 4" to 38mm centering ring above into the new tube.

cavecentral said:

Might be able to salvage the fin can and just replace the tube. Slip a 38mm mount inside the old 54 use a 4" to 38mm centering ring above into the new tube.

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Nah, I'm gonna start fresh. This rocket was fun on 54 motors... However... the fin unit might just live on as the basis for a Wocket-ish thingy...

jd2cylman said:

And then the rocket died...
I was sad. It was my go to flier. The chute didn't open. The JL CR was open at the scene of the crime, but the chute was still folded up. It broke right above the motor case. I used the HUGE AT54/426 case... I've flow the exact same combination before. Just that this time things went a little, well, off...
Oh well. Time to build a new one with the correct markings...

View attachment 374806 View attachment 374807 View attachment 374808

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Sigh...
I saw you carrying that back from the field. It was a sad sad thing to bear witness to

Tobor said:

Sigh...
I saw you carrying that back from the field. It was a sad sad thing to bear witness to

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Cripes, I meant to meet you. It's nice to put a face to the names. Next launch, grab me and introduce yourself...

jd2cylman said:

Cripes, I meant to meet you. It's nice to put a face to the names. Next launch, grab me and introduce yourself...

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Roger That.

JDcluster said:

Was cold weather a factor?

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Adrian had the fin can are built like a tank. I think one could have run it over with a car. I am thinking the angle if it hitting the hard ground just snapped the tube. Yes the cold didn't help.

Mine is nearly complete, just lacking the rail guides. Went together nicely, I blew it by not painting one fin completely black. Also, my epoxy filets were built strong, but were rough in appearance. I tried smoothing things out with some Elmers Wood Filler, but that bucket was probably old and it never quite worked the way I was hoping. Well, if you don't get too close then it looks pretty good! Yellow gloss enamel followed by clear enamel finished up the paint job. This was my first LOC kit, followed by a low powered Xeno . . . I'm very impressed by LOC quality - even the small/inexpensive kits a step above. Very nice. I'm constructing a custom electronics sled to fit into the Goblins nose cone for my Altimeter 2.

A question for those who have flown theirs: What is the lowest altitude/motor that you were/are comfortable flying this rocket with? I'd like to keep it below 500 ft for the first flight or three . . .

I've also noticed mixed results with the JLCR . . . perhaps I should I practice with it on my soon to be completed LOC HyperLoc 163?

Mark!

I just primered mine tonight. Such a cool looking rocket. I'm thinking lime green with the obligatory black fin.

grouch said:

I just primered mine tonight. Such a cool looking rocket. I'm thinking lime green with the obligatory black fin.

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Nice. Since I screwed up originally and painted the cone yellow, and the replacement parts won't include a new cone, I decided to do a reverse paint scheme.
The rocket will be black with a yellow band and one yellow fin. And a yellow cone, of course...

Maybe pink? Pink and black with black stickers?

grouch said:

I just primered mine tonight. Such a cool looking rocket. I'm thinking lime green with the obligatory black fin.

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You mean like this?!

(Rustoleum 'Key Lime')

Yea just like that. Looks pretty neat but I'm leaning more and more to the pink and black.