Planes > Scale

P47 - Electric Conversion.

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davegrennan:
Hi I'm Dave and I'm in Raheny.  Delighted to find an Irish RC forum.  I thought I was going to be forever tagging along on the UK sites hoping they don't mind too much.  To be fair, they're nice guys. Might as well start with a bit of an intro.

My primary interest is fixed wing.  I've only being doing this a few months but I've learned loads and broken lots of stuff. No not really, I've been fairly lucky.  I did manage to break my Ultra Micro Spitfire once but a bit of foam safe CA fixed it all up good as new.  I'm not in a club yet but intend to go along and introduce myself to the guys in the Phoenix Park at the next available opportunity.  I just love building stuff and know that I will end up building most of my own stuff as I get a great kick out of that.

My first major project will be to complete and convert a 57" span balsa P47 given to me by a friend a few years ago.  I got it mostly planned out where everything is to go and put in a nice order to hobbyking over the weekend for all the bits.  It's going to run on a .60 equivilent outrunner. Off a 6S lipo and an 85A ESC.

Here it is laid out on the kitchen floor.



There's a whole lot of hardware with it too, some useful some not so useful.  Those brass hinges are nasty.  They stick and just seem to be poor quailty.  I've ordered some CA hinge sheet to replace these.





So the build begins.  I decided to make the battery hatch on the top side of the nose section.  The battery will go behind the firewall. There is plenty of space in there.  



The ESC will probably be on the front of the firewall with the outrunner so it gets plenty of air.  I imaging I will have to make some more holes in the firewall to let air through to keep the lipo cool too.  This is how I envisage it will be, however there is also the option of installing a chute so the lipo will go in diagonally.



Here it is marked out ready for cutting.



...and after cutting.  It seems my balsa warbird is a hybrid foamie!!



I made a dummy battery from ply to test fit.  As you can see it rides a bit high however there is a few inches of foam at the bottom so I plan to make a recess in that just big enough to capture the bottom of the lipo and also so it sits down further.  I will wait right to the end to do this when I have a better idea where the COG will be.



Well all the gear has shipped from hobbyking.  I bought some used Futaba S3001s on ebay.  So more when all that arrives.

Fred:
Hi Dave,

Welcome to the forum  :D
And I have to say, an honour to have you with us!

For the ones who have interest in Astronomy, Dave website: http://www.webtreatz.com/

Anyway, back in topic :)
Nice job on the P47, a favourite of mine.

What outrunner from HK did you picked?  :?:

davegrennan:
Thanks for the welcome Fred.  As my late mum used to say, 'One man's carpenter is some plumbers customer'.  We all have out areas of expertise. I build a lot of the astronomy gear myself so this is a big help with building RC stuff as I have ended up with quite a well equipped workshop and have at least got some experience of engineering.

I went with the Turnigy G60/500.  It is advertised as 500Kv 1500W and is sold as a direct swap for a .60 glow engine.  I sort of figured that the 120W per pound would work here and I have roughly calulated the final weight around 10lb including battery so 1500W will give be a little more to play with and if it proves too much, I can just derate the throttle a bit anyway.

I haven't settled on a prop yet.  I would like to find a suitable 4 blade (for scale).  But props are cheap so its something I can afford to experiment with a bit.

Regards,

Dave.

Happy Days:
Hi Dave and welcome aboard. :clap:

P47 er?……you’re obviously one of the scale enthusiasts yea’? Glad to see you haven’t gone for the proverbial Spitfire. (They’re so common)

As for cooling your Li-Po……….I assume you got a 5amp battery to accommodate long duration flight times. If you are going to fly this model ‘in scale’ a 5amp 6S Li-Po rated at 30C is going to be barely “ticking over“. I doubt if it would even get warm to the touch. Even if you spent five minutes beating-up-the-sky I shouldn’t think it would get much above room temperature.

Anyway, like I said, glad you’ve joined our happy little forum.

Little Keith.
(As distinct from Big Keith, who normally just signs himself as Keith because he’s too bloody lazy to sign as ‘Big’ Keith. Not that I would tell him that to his face you understand,,….He’s much bigger than me :shock: !)

dg:
Hi Dave, I agree with ditching those hinges. Furry mylar hinges held in with CA glue should be fine for that type of model. Also, the LiPo cooling isn't really essential as your unlikely to be pulling huge Amps from it.
ps. I just sent you a PM.
Dermo

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