LOC IQSY-Terrier build

So I had done some CF/Fiberglass scratch build 29-38mm MD two stages for university comps about a year or two ago. I wanted to do a multistage since then because it was really fun and never really had the funds on my own to do one until recently. At one time I had this idea of doing a Wildman Sandhawk to custom Terrier but scratch cloning a Terrier seemed to be costly at the time and I really was afraid of doing a diameter reducing tapering interstage design myself again.

I feel fine with keeping same tube diameter on scratch staged MD models at this moment at my experience. At this time of trying L2 MD DD build I have learned a lot more of dual deploy with electronics and fear it less.

What I was longing for in 2 stage HPR hobby rocket world was a inexpensive kit to just get it together and then really get more hands on with various staging altimeters and settings. And I wasn’t seeking bleeding edge altitude performance this time. Draggy and not busting local waivers is a massive plus so yeah I’d love to keep it well below 10k ft. I had an LPR ASP IQSY at one time this year then lost it on first flight. I like draggy scale stuff or MD stuff.

LOC releases their IQSY and a separate Terrier booster. I just had to have one so here we are. This will be my first cardboard and wood HPR kit also.

What I love about the kit so far... The price and honestly the cardboard tube seems pretty stout. This is not LPR toilet roll stuff. It seems higher quality than I thought would come with a kit so inexpensive. I can squish it with fingers and it’s not crushing like a Estes tube would.

What I dislike... There’s a big old seam on the plastic nosecone. Whatever I’ll just sand it off. This is not a Wildman, Madcow, or MAC quality kit. But for its price I won’t complain.

What I plan on doing to it...
-Convert sustainer to dual deploy.
-Modify nosecone for GPS tracker payload if included coupler seems too small for this normal av bay route.
-Make Av Bay out of coupler tube.
-3D print sled for it.
-Aeropac Retainers. (I prob won’t assemble it until I get those).
-Shove a bunch of 38mm hazmat free H motors through it.

Already know I want a Raven. I’ve used those before and they work well. I might gut the stock shock cord and chutes for other components. One bad hawk and top flight stuff. Right now I’m gonna focus on creating an Open Rocket Sim for it.

Subscribed.

First I put together a detailed OR file with mass overrides of all kit components minus chutes/shock cords/electronics. I'll add what I want and figure it out as I go and get more detailed... Basically for motors I want to fly that are HAZ free I wanted to see what kinda max mach this sustainer gets. Looks like with a AT H130W in sustainer and I180 in Booster you get a max mach of 0.90 which is in transonic range. Being a wood and cardboard kit well I threw finsim at it to see what it thought. Finsim thinks the IQSY stock fin will flutter at M 0.96. Also in that configuration OR thinks it'll do 5,476 ft or so...
Simming an H130W to H130W resulted in a M0.67... And if you really want alt just go with a real long burn motor in sustainer, it’ll keep Mach down too.

If you guys are going to stuff bigger I or even J motors into this kit you might wanna follow Loc's recommendation to fiberglass the fins. I'll just fly it within it's limits on haz free stuff. LOC did their homework on fin thickness. A pet peeve of mine is buying kits and seeing finsim predict the fin will fail on a small freaking motor.

Alright I started adding more components to OR on my setup and tried sim of long burn CTI I55 to AT J350W. 7 seconds ignite after first stage burnout... About 9,487 ft and M0.74. So if you stick to long burn in sustainer it can basically handle some good sized motors without glassing. Cooool!

This is my primary deviation from the LOC instructions. I figure if your gonna send stuff 6200 ft-10,000ft just make it dual deploy. So I slice a little hunk off the upper payload tube to make an av bay vent band. No sense in buying a av-bay kit for $60 if you don’t need too. Lmao. Not the best with a hacksaw so I had to sand the edges where I cut. 220 grit sandpaper seems to make quick work of smoothing out edges.

Ordered 60 ft OBD 3/16” Kevlar.
Ordered 2 x 38 mm L aeropac.

Andrew_ASC said:

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This is my primary deviation from the LOC instructions. I figure if your gonna send stuff 6200 ft-10,000ft just make it dual deploy. So I slice a little hunk off the upper payload tube to make an av bay vent band. No sense in buying a av-bay kit for $60 if you don’t need too. Lmao. Not the best with a hacksaw so I had to sand the edges where I cut. 220 grit sandpaper seems to make quick work of smoothing out edges.

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IMO - one of the best features of the LOC ebay kit was the stiffy coupler reinforcement. The website says the the kits is $27, not a bad price for the ebay with associated hardware.

richP said:

IMO - one of the best features of the LOC ebay kit was the stiffy coupler reinforcement. The website says the the kits is $27, not a bad price for the ebay with associated hardware.

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And you get the bulkhead plates, all-thread and sled. Not a bad deal for $27. I always add an eBay kit to my LOC kits.

heada said:

And you get the bulkhead plates, all-thread and sled. Not a bad deal for $27. I always add an eBay kit to my LOC kits.

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Lol sorry guys I was looking at some apogee blue tube kit and merely laughed at price.

heada said:

And you get the bulkhead plates, all-thread and sled. Not a bad deal for $27. I always add an eBay kit to my LOC kits.

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Best part, the bulkhead seals against the stiffy coupler, so you can torque down on it without fear of kinking the thinner coupler tubing.

Well I’m just gonna 3D print something bulkheads with flanges, buy some all thread, and make my own 3D sled for the fun of it.

Any updates on this build?

Sorry no it’s in the corner. Been way too busy with work lately. As much as I hate to say it. We basically have $20-$40 mil conveyor due a month. Hope to update later next year. Sorry.