aluminium tape covering

[drifter]

hi all i put a post up on rcmf asking this. Hi all i've just ordered a artf b17 flying fortress from general hobby in the states (link) http://www.generalhobby.com/flying-fortress-bomber-electric-airplane-p-72.html?osCsid=7e5cd49a9f9ca95ba15ecee8fe0409ec  just waiting on it turning up     its my first big balsa and ply plane and i've only got just under a years flying experience'knowledge. i'm going to try and scale it up a bit with additional windows'panel lines'rivets etc as per the real one and want to cover it with aluminium tape i've read on another forum that the aluminium weighs 5.5 grams per sq yard but im not sure what the wing loading could take in weight i know the auw is 4.5lbs but would it hold an extra 2-2.5lbs on the wing if i went to far with detailing

 

i got a reply back saying not to bother because i'll lose the plane in flight as the signal will be lost due to the covering shielding the signal and also the person doesnt recommend using silver coating as for signal loss.

 

im using a spektrum dx6i with ar6200 rx 2.4ghz what would your thoughts be on this matter i really would  to cover my model to be like this (link) http://www.rcgroups.com/forums/attachment.php?attachmentid=830738 thanks in advance LES

[Tim Mackey]

Well if it was me I would simply arrange ( as I do an almost all of my models irrespective of their construction ) to get the tiny 1" of  "live aerial" to prtrude from the fuselage - should be easy enouggh and inconspicuos on a large B17!

The excellent ( despite the doubters ) AR500 with aerial extension would be fine, or if you still have worries....simply use one of the purpose designed C/F glider style receivers.

[Vecchio Austriaco]

Use the AR6250 receiver - this one is specially built for fuselages having a "screening" surface like carbon reinforced plastic (or metal as in your case). The 2 antennas have a 5 cm extension and the metallic looking part after the extension has to be outside the fuselage. They can used in a position where the real antennas were on the prototype - if that is possible.

By the way  - the AR 6250 is the glider stile receiver Timob mentiones above.

VA

[drifter]

thanks timbo and va that rests my case i'll go for the ar6250 receiver for piece of mind doesnt cost the earth really  now i think it's time to get ordering my tape

[IanN]

Drifter, wing loading at the manufacturer's quoted AUW of 4.5lb is almost 19oz per sq foot.

 

If you add your "extra 2-2.5lbs" you're then looking at 27.3 oz/sq ft (for 6.5lb) or 29.4oz/sq ft (at 7lb).

 

Plus, if you then find you need to uprate in other areas to cope with the above weight increase - bigger flight batteries, e.g. - then its going to be heavier still and these figures are going to deteriorate even further

 

 

 

 

[drifter]

thanks for the reply i'm thinking of a max 6.5lbs or just under but would it be alright to increase the weight this much?

 

 

 

Edited By drifter on 11/02/2010 14:43:15

[Alan B]

Hi Drifter

 

Am I missing something here - where do you get the extra weight of 2-2.5 lbs from?

 

Al

[drifter]

hi Al the weights going to come from the aluminium tape it weighs 5.5 grams sq yard ( 3 foot by 3 foot) plus im going to be adding loads of detail like rear gunner' windows etc

[Alan B]

Hi

 

Still cant get my head around it. If say the 2-2.5 lb is equivalent to approx 1100 grams

 

1100 divided by 5.5 grams is approx  182  sq yds or 1638 sq feet of tape  or for arguments sake - if you used only half that - that still would be 91 sq yds! thats alot of aluminium tape.  the other detail must be very heavy or the model is huge!

 

just looked at the link.  Nice model ! - I would have thought you would have only needed about  3 to 4 sq yds of alumium at the most -  22 grams - so where would the kilo + of weight come from

 

Al

Edited By Alan B on 11/02/2010 16:19:55

[drifter]

Hi Al i know i've confused you  lol i just gave a weight of 2.5lbs incase i want bigger batterys ' scale it up ' rear gunner' front turret gunner etc etc all i wanted to know is if the wing loading would be alright?   

[Alan B]

Ok

 

 I personally would try to keep it light.  Even with a bigger battery and a scale up. I think you could probably do it with only a extra  300 - 400 grams.

 

Well good luck with your build/project - it would be nice to see the end result in the future

[drifter]

i'll try my hardest to keep it light because the heavier it is the faster it's going to be so it wont look very scale in flight thanks for all your replys AL and i will post some pics when it's complete im hoping around april-may time

 

LES

[Former Member]

[This posting has been removed]