Edmonds Aerospace Geminee Thunder

Edmonds Aerospace - Geminee Thunder {Kit}

Contributed by Hank Helmen

Construction Rating: starstarstarstar_borderstar_border
Flight Rating: starstarstar_borderstar_borderstar_border
Overall Rating: starstarstarstar_borderstar_border
Manufacturer: Edmonds Aerospace
Edmonds Geminee Thunder

Brief:
T' Edmonds Geminee Thunder is a twin glider with a single 24mm aft engine. T' gliders are supposed t' boost up on D12-3 and then separate usin' the ejection charge. Well, blow me down! Blimey! Glider should then circle slowly back t' earth!

Construction:
Included in t' kit is one balsa nose cone, one balsa "plug" (to join the glider body tubes), shiver me timbers, two 25mm body tubes, me hearties, four sheets o' 1/4" laser cut balsa parts, a chunk o' clay, and a 3/16" launch lug. Well, blow me down! T' balsa is very light weight (soft).

Geminee's instructions consist o' two 8-1/2" X 11 notebook sized pages black and white printed on both sides with good diagrams. Begad! Blimey! I found t' gliders easy t' build, but I have built many R/C airplanes and rockets before. Avast! Blimey!

Edmonds Geminee Thunder Instructions are OK but more information would really help this kit. Aye aye! Begad! T' engine mountin' details and t' glider testin' department are lacking. Ahoy! There was no instruction as t' how t' prepare t' engine mount other than "use masking tape t' tape t' engine in tightly". Well, blow me down! Also t' instructions did nay tell that t' engine stays in t' second glider durin' t' recovery glide, ya bilge rat, arrr, and therefore should be test flown with a spent engine casin' in place.

T' instructions that are thar are easy t' follow. Avast! Arrr! T' fit o' laser cut parts is good. Begad! T' only special tool that you need is a true flat surface large enough t' accommodate t' 23 1/2 inch win' span o' this beast! I used a vertical millin' table and weighted t' 1/4" balsa down t' keep it perfectly flat. Avast, me proud beauty!

Finishing:
There is no guidance in t' instructions as t' how t' paint or finish the model. I assume this is because if you want maximum glide performance, you need light weight. Begad! Blimey! Testors spray paint or most any other typical paint will add a whole lot o' weight t' these big wings and change t' center o' gravity drastically.

Edmonds Geminee Thunder Competitive rocketeers know that paintin' boost gliders hinders performance so they don't do it! I chose t' give t' Geminee two coats o' Aerogloss clear dope thinned 50% in order t' give it more strength and help protect it from wet grass, etc. Avast! I also used bright permanent markers t' aid in trackin' and recovery. Aye aye! There are no decals in t' kit. Titebond yellow carpenters glue was used for win' and fin joining.

Construction Rating: 3 out o' 5

Flight:
T' only recommended motor be t' D12-3. Preparation is easy, just stick the engine in and insert your igniter. Ahoy! Blimey! No waddin' is required.

On me first and only launch t' gliders began straight on lift off but after about 40 feet up began t' arch over toward St. Blimey! Louis! Under full engine power t' Geminee nosed straight down into terra firma! T' engine then ejected with a very sharp and loud "boom!" T' engine casin' may have flown higher than t' gliders! I used a 24mm C11-3 for t' first flight. Blimey! Begad! I'm nay sure if this affected t' flight. Ya scallywag! Perhaps t' D12 would have accelerated faster and given a straight boost? I dunno. Arrr! Once again thar are no troubleshootin' flight tips in t' instructions such as what type o' launch rod t' use or what size engine nay t' use, etc.

Recovery:
There is no shock chord on this model. All o' t' balsa is very lightweight 1/4" stock.

Luckily t' ground be soft from recent rain and t' only damage was that the nose cone was pushed in flush with t' front body tube along with a lot of mud.

Edmonds Geminee Thunder I'm thinkin' that I should have used a larger diameter and perhaps longer launch rod. Blimey! I used only a 36" long 1/8" diameter rod. Avast, me proud beauty! I think this thing needs t' get some speed up for dynamic stability before lettin' it go free.

For some reason I took t' upper glider and gave it a "test glide" after pullin' it out o' t' dirt. Blimey! Blimey! T' forward part o' t' fuselage snapped in two where it joins t' body tube on landin' again, shiver me timbers, right along the grain. Avast, me proud beauty! This was t' second or third time this had happened. Avast! Blimey! Repair be easy and I plan t' fly this thin' again as soon as we get a calm day and I have the time.

Flight Rating: 2 out o' 5

Summary:
This is a pretty good kit but it needs some improvement in t' instructions department. T' main PRO o' t' Geminee Thunder is o' course its size and excitement o' twin gliders floatin' down.

T' CONs are that t' instructions should give more information on test glidin' in tall grass t' verify center o' gravity o' each glider. Avast! Blimey! They also need more information on how t' engine should be mounted and how t' glider uses t' ejection charge t' separate therefore t' engine must remain in place durin' t' entire flight. T' fuselage balsa should t' be stronger, me hearties, I have used 1/2" Carbon Fiber Laminate "tape" from Hobby Lobby International t' reinforce me fuselage sides where they join t' glider body tubes. Ahoy!

Overall Rating: 3 out o' 5

Other Reviews
  • Edmonds Aerospace Geminee Thunder By Frank G. Whitby

    Brief: Geminee Thunder is an upscale version of the Edmonds Geminee twin glider. Construction: As with other Edmonds gliders, the kit comes complete with detailed instructions and well designed, precision cut balsa parts ready to be assembled. All of the parts were in perfect condition and high quality balsa was used throughout. The assembly was very simple. Rob Edmonds ...

Flights

Comments:

avatar
H.W.H. (January 28, 2006)
Interesting review. Accurate in that my forward glider's glider to body tube balsa broke every time I flew it. I did not have a good boost on a C11-5 engine. I got a St. Louis Arch to a lawn dart with the engine ejecting out of the back with a loud Bang! I'm wondering what diameter and length launch rod to use? I did not paint mine either.
avatar
H.W.H (March 11, 2006)
Follow up to above review: Repaired Geminee Thunder glider fuselage and nose cone. Re-balanced both glider with hand toss test flights. March 11, perfect clear, no wind day. Made a new launch gantry consisting of 3/16" steel launch rod 4.5 feet long. Two 24 inch crossed two by fours for a base and a two foot extention post to hold the gliders up off the ground. Geminee Thunder on D12-3 launched well but began to arch over at 75 feet altitude. Looked like a classic nose dive into the ground but the gliders pulled out of the power dive at 30 feet and flew horizontally at Mach 2 for 50+ yards when it began yet another strange turn then... Exploded Spectacularly from the ejection charge! Balsa rain! Trailing edges of both glider's wings were badly burned from the engine exhaust. Had to extinguish wings with water bottle. Nose cone is Gone and balsa joiner piece is black and shredded. Probablly the most exciting rocket launch I have ever witnessed~! Repairable? Have to wait and see, Geminee is currently in a deep coma, on operating table (workbench) ... Hmmmmmm Hmmmmmm ... tick tick tick. What if it comes back to life and then goes back to its same bad habits?

comment Post a Comment