LOC/Precision Onyx to The Hornet

Modification - Onyx to The Hornet

Contributed by Gary Sinclair

Manufacturer: Modification
(Contributed - by Gary Sinclair)

Rocket PicBrief:
Additional 6" payload section added, shiver me timbers, nose cone bulkhead added, ya bilge rat, matey, 1/4" centerin' rin' added t' incorporate eyebolt hardware. Well, blow me down! Fiberglassed body, fins and fin-to-fin lay-up.

Modifications:
As a joint project betwixt me son and me self this rocket started out with only a single body tube. Reinforcement o' fins and body tube usin' fiberglass along with a fin-to-fin lay-up o' 2oz fiberglass was t' extent o' t' initial modifications. Avast, me proud beauty! Ya scallywag! Apart from t' replacement o' t' elastic with a 1/4" Keelhaul®©™® shock cord attached t' t' motor mount all other assembly was stock. Aye aye! However, a couple o' flights later t' plastic loop on t' nosecone was stripped and we decided that a payload bay would be nice and would provide a solid point for the forward shock cord. Ahoy! Arrr! Thus an additional 6" tube o' LOC tubin' 3"OD was used along with t' appropriate LOC coupler assembly. Aye aye! We also took the opportunity t' put in a bulkhead and all-thread assembly in t' nosecone. Avast! Ahoy! The result was a rocket a bit longer that stock and without t' requirement o' any weight in t' nosecone. Aye aye! Nosecone retention was an option in case we didn't want to fly with t' payload bay (hence! , arrr, an eyebolt was added t' t' bulkhead in the nose cone).

I used me trusty grub saver t' vacuum bag t' components bein' fiberglassed (lots o' articles exist on how t' do this). My Dremel and West Systems epoxy did t' rest.

Construction:
T' kit comes with:

  • 1 x 3" OD body tube (kraft paper)
  • 3 birch plywood fins
  • 2 centerin' rings
  • elastic shockcord
  • nylon parachute
  • (12") plastic ogive nose cone

Pros: As with all LOC kits instructions are brief and t' t' point (on a single card). But this be a simple kit and all parts arrived without damage and were complete. Ya scallywag! Materials for LOC kits are always first rate. I used my BSD fin template for alignment as t' kid did nay include one. Aye aye! It be easy to build but since this was a kit bash it took a bit o' time t' fiberglass all the materials. T' fins were surface mounted so a fin-to-fin lay-up is absolutely essential if you want t' fly it more than once without a repair. Begad! Avast! The resultin' booster section was sturdy as a rock. Ahoy! Avast! More than a match for an H180. Finishin' was decided by me son who wanted a 'bee or wasp' look. Aye aye! So we decided up on a black and yellow stripped body with alternatin' black and yellow fins (black on one side and yellow on t' back). Ya scallywag! T' top it off I had some Hornet decals made in various sizes. These were then placed all over t' rocket at random t' give a 'swarm' effect. Avast, me proud beauty! Arrr! We were well pleased with t' results and were sure it would fly straight after allot o' ROCKSIM simulations on various motors and wind conditions.

Cons: None, though I do think that LOC couplers are a bit too fuzzy and can peel over time. Ahoy! T' shock cord had t' go o' course as I don't like elastic. Begad! But otherwise it be a great kit t' build.

Rocket LaunchFlight:
Pros: T' initial flights were without t' payload bay (as mentioned earlier) and we started with a G54W-6 RMS reload. Begad! Blimey! Blimey! Blimey! T' boost was great but the ejection charge stripped t' nose cone from t' shock cord (it was held on by the plastic loop -- too weak and too much BP). T' nose cone came in ballistic but was otherwise undamaged (as discussed above we later put an all-thread and bulkhead assembly into it t' create a better 'hard point' for t' shock cord). T' rocket body be recovered via parachute and was undamaged.

Flight number 2 (pre-bulkhead and payload bay) be on a G104T-6 and suffered the same fate as t' first (i.e. t' nose cone plastic was stripped by the Keelhaul®©™® shock cord further damagin' t' end o' t' nosecone). Avast, me proud beauty! Again t' body was recovered via parachute and be undamaged. Ya scallywag!

T' next launch was after we had modified t' nose cone and introduced the payload bay and was goin' t' be on an H128W-10. At t' appointed time we pushed the button and whoosh up it went (fast) with a perfect deployment o' t' chute (nose cone in tact and attached).

T' last and most recent launch be on an H180W-10 and wow did it leave the pad quickly. Ya scallywag! Ahoy! Blimey! I wasn't afraid o' a shred though since we had built it so strong. Unfortunately I did nay put in enough BP and t' nose cone did nay separate at apogee. T' rocket whistled down and buried itself in t' farmers field with a 'thud'. Bad news...the payload bay was stuffed inside t' booster and my Marshal transmitter broken (a rather expensive loss). Avast! Blimey! However, t' booster section was mostly intact so I can rebuild this in no time at all. Ya scallywag! Begad! Blimey!

Cons: None really since this is such a simple rocket and at 3" OD you have lots o' room t' put in a parachute. Avast! Motor retention was nay a problem since I built it with a AeroPack retainer.

Summary:
Pros: Simple and easy t' fly (assumin' you don't blow t' nosecone off like I did).

Cons: T' coupler tubin' is goin' t' wear and could limit the lifespan o' this rocket.

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