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RE: Electric 1/4 Spitfire MK1A full composite - 5/17/2007 7:40:33 PM   
transatlanticflight


 

Posts: 84
Joined: 7/26/2006
From: , MA, USA
Status: offline 		Grumpy,

That's about $2700 US at the current exchange rate. Seems more than reasonable for the quality and level of detail. Several questions about the finished product: (1.) Approximate estimate of completion date for shipping of first unit? (2.) I assume this will be sold in kit form, not sold as an ARF requiring only final assembly? (3.) One piece wing? (4.) Option for gas motor? (5) What's your plan for actuating control surfaces? Servos located at the control or remote with linkage, push-pull, push rod? Concealed linkages I assume on a beautiful scale example like this?

Thanks. I'm very interested and will stay tuned for more. Great looking gull wing detail

Rick

What kind of length runway would a bird this size require? Anyone? My club's flying field is tight and short even for 120 size planes. Might have to shop a bigger field for one of these. At that price, I'd buy 2 just so the first one doesn't get lonely. I'm still trying to shoe horn a gas engine in my KMP Spitfire...maybe I just need a bigger plane! lol

(in reply to Grumpy1940)
       Post #: 76

RE: Electric 1/4 Spitfire MK1A full composite - 5/17/2007 9:15:24 PM   
Grumpy1940


 

Posts: 272
Joined: 3/28/2006
From: vantaa, FINLAND
Status: offline 		Good questions Rick!
i know its reasonable price. if it flyes well. compare to comp arf planes and so on.
its possible to laminate for gasser or electric. will see what is weight in electric prototype. goal with electric is 13kg (extrem light) and for gasser about 15-16kg when using 70-80cm3 engine. but its very easy to change the laminates for bigger engine if requested. i believe 1st possible date for shippins is between september-december. goal is to get main airframe molds done before september. then scale accesories exhausts, wheels, maybe cockpit... and so on.
in prototype i will put servos in wing straight connect to controls, hidden ofcourse. and wing mold will be designed for 1 or 2 pcs wing. prototype will be 1 pcs..
and im siriously thinking to do honeycomp (nomex) construction in proto. but airex and balsa sandwich are good options too. and maiden will be done from 400meter long grassfield!! or on frozen lake if im slow. and because its scale plane some work is left for builder. leaving some options open.
if more questions just ask...

Cheers Grumpy

< Message edited by Grumpy1940 -- 5/18/2007 2:57:36 PM >

(in reply to transatlanticflight)
       Post #: 77

RE: Electric 1/4 Spitfire MK1A full composite - 5/19/2007 4:57:22 AM   
transatlanticflight


 

Posts: 84
Joined: 7/26/2006
From: , MA, USA
Status: offline 		All sounds good. looking forward to following the progress. Any dimensions yet on fire wall to thrustwasher, etc, (general cowl dimensions), to start thinking about powerplant options? 70-80 cm3? Excuse my metric ignorance, how does that convert to cc's? Or just another way to say the same thing? Also, I'm familiar with nomex fabric (flame retardent suits) but how does it function as a wing core? Other than those questions I'm going to leave you alone so that you have more time to build!!

Rick

(in reply to Grumpy1940)
       Post #: 78

RE: Electric 1/4 Spitfire MK1A full composite - 5/19/2007 6:22:49 AM   
Grumpy1940


 

Posts: 272
Joined: 3/28/2006
From: vantaa, FINLAND
Status: offline 		Hi Rick!
no problem at all. the engine 70-80cm3 is 4.20-4.80 size. yes nomex name you find in fire eguipment too. but honeycomb nomex is made from aramidpaper and it have highest compression strenght in all sandwich materials. and its lightest. highvacuum and good care in bonding is needed. and its most epensive material too. on minus side.
maybe design it around 3w engines. and some prop extension from sierra giant and nothing hanging out side of cowl. i can take later dimensions from it.
http://download.r-g.de/handbuch/en/kapitel09.pdf
here more info from honeycomb and technic... good technical info!

cheers

Grumpy

(in reply to transatlanticflight)
       Post #: 79

RE: Electric 1/4 Spitfire MK1A full composite - 5/28/2007 5:33:11 AM   
LAWNDART65


 

Posts: 30
Joined: 12/12/2006
From: CORONA, CA, USA
Status: offline 		Grumpy you sure know how to put my little Don Smith Spitfire to shame. Great work can't wait to see more. John

(in reply to Grumpy1940)
       Post #: 80

RE: Electric 1/4 Spitfire MK1A full composite - 5/28/2007 5:33:00 PM   
Grumpy1940


 

Posts: 272
Joined: 3/28/2006
From: vantaa, FINLAND
Status: offline 		Thanks, John!
your spitty looks fantastic!!! i follow continously your thread in rcsb!!
wing plug is almost done, but i dont have camera before friday... so pics then. hoping the wings is cleaned too.
cheers

jukka

(in reply to LAWNDART65)
       Post #: 81

RE: Electric 1/4 Spitfire MK1A full composite - 5/30/2007 4:41:56 AM   
LAWNDART65


 

Posts: 30
Joined: 12/12/2006
From: CORONA, CA, USA
Status: offline 		You got on real big electric motor. Wow!! I am really liking electric powered planes. I am going all electric on my twins, and single engine is not hard to imagine for me. I think it is the way of the future. Alot more fun anyway, charge it and fly. John

(in reply to Grumpy1940)
       Post #: 82

RE: Electric 1/4 Spitfire MK1A full composite - 5/30/2007 6:22:22 AM   
Grumpy1940


 

Posts: 272
Joined: 3/28/2006
From: vantaa, FINLAND
Status: offline 		indeed John!
there is few good points with electric... no fuel proofing, wide rpm range, high torque= turning huge 30 inch propeller, real 100db merlin sound system(from benedini), low vibration=lighter laminate. and cost for electric is mot so bad anymore.
500€ motor, 200€ esc, and battery 600€. compare to gasser the difference is not so high anymore. and im sure batteryes will be cheaper in future... new A123 batteries started the economical season for electric. soon those seen more often in electric plane. im sure. i go still with lipos, coz i had chargers already.

just a few toughts...

(in reply to LAWNDART65)
       Post #: 83

RE: Electric 1/4 Spitfire MK1A full composite - 6/4/2007 2:43:53 AM   
Grumpy1940


 

Posts: 272
Joined: 3/28/2006
From: vantaa, FINLAND
Status: offline 		The wing is almost done!!! 2 small panels and 6 small details misssing only... i was flying a lot at this weekend. very hot here at this moment. so i didnt have much energy for hammering. but i finnish the wing plug today!!! i put more pics then... sorry about the mess in my shop...



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(in reply to Grumpy1940)
       Post #: 84

RE: Electric 1/4 Spitfire MK1A full composite - 6/4/2007 5:48:33 PM   
Grumpy1940


 

Posts: 272
Joined: 3/28/2006
From: vantaa, FINLAND
Status: offline 		Jiihhaa!! wing plug is ready!! next and last ... fuse!!


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(in reply to Grumpy1940)
       Post #: 85

RE: Electric 1/4 Spitfire MK1A full composite - 6/4/2007 7:21:23 PM   
bla bla


 

Posts: 1580
Joined: 9/19/2002
From: Oslo, NORWAY
Status: offline 		You're a sick man Grumpy.
Now the body and this is the place you can screw up.
99% of the model spitfires (even the competition ones) you see have far to good panel fit on the fuse' forward of the canopy.
The fit and finish on the full sized is pretty damned grim, they're rough and fit is far removed from the smooth effect most people think is correct which is similar the wing or rear fuselage.
This is the point you can make something just fantastic. Make the panels appears as if they're LOOSE AND ADDED ON... & NOT MOLDED INTO THE BODY if you get my drift.
Ahhh sure you understand!
If everything is to scale (which I have no doubt it is, you've possibly got the best plug/mold of a Spitfire available.
Congratulations.
Remember you need to pull one out with my name on it.

_____________________________

BR blabla

(in reply to Grumpy1940)
       Post #: 86

RE: Electric 1/4 Spitfire MK1A full composite - 6/5/2007 2:08:29 AM   
Grumpy1940


 

Posts: 272
Joined: 3/28/2006
From: vantaa, FINLAND
Status: offline 		Yeah, i feel you!
the lithoplate i use is kinda scale thickness. and making panels in correct order from tail to nose with over lapping seams. thats only correct way to do it. and panzer over fuel tank need to be double thickness. trying my best and cant sleep if i do compromise... so its not an option!!
mayby at winter time i pack my telemark skis and set of spitfire and drop one slim lady to your home!!

cheers

Grumpy

< Message edited by Grumpy1940 -- 6/5/2007 2:10:26 AM >

(in reply to bla bla)
       Post #: 87

RE: Electric 1/4 Spitfire MK1A full composite - 6/5/2007 3:36:59 AM   
DaddySam


 

Posts: 976
Joined: 7/27/2003
From: Pullman, WA, USA
Status: offline 		The armor plating over the fuel tank is one of the main reasons for that look of poor fit and finish. It is a physically raised panel. I've got a pretty good photo of it somewhere. I'll try to attach it.
Sam

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< Message edited by DaddySam -- 6/5/2007 5:10:44 PM >

(in reply to Grumpy1940)
       Post #: 88

RE: Electric 1/4 Spitfire MK1A full composite - 6/6/2007 7:00:04 AM   
Grumpy1940


 

Posts: 272
Joined: 3/28/2006
From: vantaa, FINLAND
Status: offline 		Hi Sam!
the way i going to do the armor for fuel tank... armor plate will be done without annealing. it will give smoother surface and imagination of steelplate. it really looks different than annealed alloy. and screw it on plug with real screws. there is 3 different type of screws. i have done this with my smaller spitty and it works...

cheers

Grumpy

(in reply to DaddySam)
       Post #: 89

RE: Electric 1/4 Spitfire MK1A full composite - 6/6/2007 7:05:43