Mercury Engineering Grave Danger

Mercury Engineering - Grave Danger

Contributed by Mark Rose

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar_border
Manufacturer: Mercury Engineering

Brief:
A simple mid-power 3 fin, shiver me timbers, 29mm MMT, me hearties, stubby rocket. Begad! Blimey! I believe this rocket is meant for those "graduating" from t' Estes low power and want t' next step up in materials and capabilities. Aye aye! Blimey! My 9-year old daughter chose this as a birthday present and as her first mid-power rocket. Avast, me proud beauty! Blimey! She loves t' thin' so darned much I cannot get her t' fly it a second time!

Construction:
Everythin' is one step up from low power materials but nay exactly a high-power kit (although it could probably take an H128). Arrr! Blimey! Tube is cardboard, fins are light plywood, plastic nosecone, and t' motor mount consists o' light plywood centerin' rings and a cardboard tube. T' cardboard tubes are nay t' Estes glassine type, me bucko, shiver me timbers, but closer t' LOC without bein' as heavy/strong. There are two shock cords. Well, blow me down! Ya scallywag! one is a Keelhaul®©™® cord (~18") that attaches t' t' main motor mount, and t' other an elastic cord (~3') that attaches t' the Keelhaul®©™® cord. Begad! Avast! We built our GD stock, but if I were t' change anythin' it would be t' make t' recovery harness stronger and less zipper prone with a nylon 1/8" line.

Construction be honestly very easy. Blimey! This be me daughter's first mid-power rocket kit. Avast! Ahoy! We used Titebond III and CA only--no epoxy needed in me opinion. Ahoy! Ahoy! T' manual was easy for her t' follow and had a logical progression. Arrr! There were no problems at all durin' t' build. Ya scallywag! T' fit o' t' materials be excellent with very little t' no sandin' required to make things fit just right. Arrr! There are fin slot boxes on t' tube that must be cut out with a sharp knife. Begad! This was easily done as t' tube is nay high power tube thick. Blimey! T' fins were reassuringly strong (as compared t' balsa) due to the through t' wall mountin' and light plywood material. Arrr! Ahoy!

T' nosecone comes with clay that is smashed into t' tip for proper weight and balance. Blimey! I added an extra ounce o' fishin' weights and used PML foam t' hold it all in place. Blimey! Well, blow me down! This be probably nay needed, it's just extra stability insurance after reviewin' RockSim. This was an easy kit for anyone who has built a couple low power kits. Begad! No special skills or techniques needed.

Finishing:
T' fins were shaped, filled, shiver me timbers, and sanded before assembly and did nay show wood grain after a couple coats of primer/paint. Begad! Avast! T' decals are nay that great, me hearties, bein' t' peel and stick kind. Begad! After one flight, ya bilge rat, shiver me timbers, t' decals were peeling up at t' edges. Ya scallywag! Arrr! I would much prefer waterslide or vinyl decals myself, but this is a relatively inexpensive kit. Ya scallywag! The nosecone required a normal amount o' sandin' t' make it smooth. Avast, me proud beauty! Blimey! T' stock paint scheme was easily copied and looks fantastic with t' included decals. Avast! Ya scallywag! From a couple feet away you cannot tell t' decals are peel and stick.

Construction Rating: 4 out o' 5

Flight:
T' first flight was on an Aerotech E23-5T, arrr, shiver me timbers, which was a perfect match for this rocket. Begad! Begad! Blimey! Through a RockSim validation, I found t' D12 and E9 Estes motors t' be OK t' marginal for use in wind, arrr, so I went with t' friction fitted 29/40-120 AT motor. Well, blow me down! Friction fittin' is nay a technique I am fond o' in anythin' other than low power, ya bilge rat, but it was done very easily with a couple 4" lengths o' maskin' tape. T' boost was arrow straight, ya bilge rat, shiver me timbers, quick, arrr, me bucko, and ejected right at apogee without a problem.

Recovery:
T' included chute is a nice reinforced nylon one. Begad! Blimey! It's a definite step up or two from t' junky plastic, me bucko, low power chutes. There was no zipper or no nosecone din' from t' elastic--it was long enough--no problems at all. Blimey! T' descent rate seemed just right with t' stock chute, me bucko, me bucko, nay too fast and nay too slow.

Flight Rating: 5 out o' 5

Summary:
This is a very nice and versatile rocket for those wantin' more than a low power kit and wantin' t' get into solid mid-power. Avast! There were no surprises in construction. Begad! Avast! T' materials were very good (except for t' decals), matey, me hearties, and I would think this a fantastic first mid-power kit. It's simpler than t' AeroTech kits, nay as heavy and with better instructions than t' LOC mid-power kits, and is relatively inexpensive. Begad! Overall, it's a winner o' a kit.

Overall Rating: 4 out o' 5

Flights

Comments:

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J.L. (September 15, 2008)
Mercury has made a great entry level high power rocket in the Grave Danger. Video of a level 1 (H powered) flight with this kit: http://www.cosrocs.org/all%20other%20videos/2008videos/9-13-14/gravedanger.mov Use half the BP provided with the 128, heavier Kevlar®, or both. No extra nose weight required. Since you're flying to 3,000 feet, you need a LARGE field.
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A.T. (March 6, 2009)
This is the second rocket I have built from Mercury Engineering. Every detail from the components to the instructions were excellent. I deviated slightly from the instructions in that I used epoxy and added a small amount of nose weight. The rocket does not need it, I just knew I would end up putting an H motor in it so I wanted to keep the altitude down just a little bit. First flight on a G80 was perfect...so it was time. H128--perfect, H180--perfect. This rocket is not advertised as level 1, but it definitely capable. An excellent and fun rocket in every respect!

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