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Old Jun 28, 2015, 08:49 AM
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Build Log
Bluetooth controlled 12" SE-5a

Now awaiting for parts and building materials for the Whirlwind I thought I'd resurect a project I'd started a little while ago which I thought wouldnt take too long to complete.

At the height of developing the Microaces Smartphone controlled aircraft last year I explored building a mini biplane that would be very easy to fly, stable and require a lot less space than the Spit & 109.

I had also admired the work that speedy01, mtflyr and jingjingjing (to mention but a few) have done with their beautiful WWI creations and wanted to produce a fully 3 dimensional fused aircraft. The SE5a, being boxy, lends itself to an easy build and has a reasonably long nose so you dont need to cram everything up front to hit the CoG.

Now I got as far as cutting evereything out and tacking it together for some glide testing - no electronics, just a basic airframe. It was to show to the electronics manufacturers to let them know where we could take their product when we initially met with them.

After the bad news at the beginning of this year that we couldnt progress this product line, the model just stayed on the shelf gathering dust.

Recently GDBot started a thread that related to the Bluetooth system that's used in some of the PowerUp toys, which is essentially the electronics used in the aircraft we developed. And that got me thinking again as I have some of the electronics left and it would be great fun to get the SE5a flying using my iPhone. (It does get some attention when people see you flailing your phone about in the air at a tiny flying object).

So I stripped the model down and have started work on building it back up again.

I've installed a 7mm motor with gearbox. (I could probably get away with a 6mm but its what I had in the box).

The use of polypropylene has been put into the mix too. Its used for the undercarriage, struts and connects the forwrd firewall to the first bulkhead.

I weighed everything (apart from wheels and prop) and it comes in under 20g so i'm hopeful it should fly quite well once complete as the model seems to have a large wing area.

The control will come from the bluetooth unit and will be throttle and rudder only.

If it works well I may well try printing onto the 1mm Depron covering using a skin from RoF or some other sim.
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Old Jun 28, 2015, 09:45 AM
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looking forward to seeing this completed
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Old Jun 28, 2015, 03:44 PM
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Looks nice man, have a parts list? Theoretical flight time?
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Old Jun 29, 2015, 03:08 AM
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Got about 8 - 12 mins from the spitfire & 109 using the 110mAh cell. This model is a bit bigger, heavier and draggier (is that a word?) though so I'd be happy with 5-7 mins. Parts list? - make it up as I go along depending what I can find in 'the box'!

The only thing I think I might need to buy in is a good 3-3.5" prop. I've got some GWS stuff but its all a bit too chunky for this scale.

Wheels made - they add 400mg. tyres are made from squishy neoprene which can be bought in various extruded diameters, right down to 1mm. this is 3mm stuff.
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Old Jun 29, 2015, 11:12 AM
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That's looking real good, I too saw the GBot site and thought of what you did and looked almost the same thing. Great idea you have there. I'm happy you haven't totally abandoned your love for RC planes. Hope to see it up and flying.
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Old Jun 29, 2015, 12:26 PM
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Quote:
Originally Posted by NEWBEFLYER View Post
I'm happy you haven't totally abandoned your love for RC planes. Hope to see it up and flying.
In a way the closing of Microaces has released me a little to do what I want without having to try and monetize it.

Now here's a question: found a few 130mm props in the box. I've cut one down & balanced - it looks just the ticket, but it has a 1.5mm bore and the shaft on the gearbox is 1mm. Any thoughts on how to get the prop mounted?????

Here's a few more pics of the progress...
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Old Jun 29, 2015, 12:46 PM
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Quote:
Originally Posted by deadbird View Post
Now here's a question: found a few 130mm props in the box. I've cut one down & balanced - it looks just the ticket, but it has a 1.5mm bore and the shaft on the gearbox is 1mm. Any thoughts on how to get the prop mounted?????
Dip the prop shaft in something suitable that will leave it coated with an even layer (ie paint or thinned glue).
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Old Jun 29, 2015, 01:42 PM
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I use 1.2mm heat shrink. Shrink it onto the axle then hold it near the motor housing with needle nose pliers and pull on the other end while the heat shrink is still hot. This should thin it enough that you can mount the prop. You could always ream the bore in the prop to make it a bit bigger.
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Old Jun 29, 2015, 03:30 PM
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I've had good luck with wire insulation.
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Old Jun 29, 2015, 08:35 PM
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Wow! Very, very cool as usual. Keep it going,

Pete
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Old Jun 30, 2015, 03:30 AM
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Well, managed to get this far. Everything seems to be working. I find actuators soooo fiddly to work with as those wires are so delicate and I have my moments of not being so delicate!

Thank you all who suggested prop fitting. I've tried the coating method - using ZAP GOO as it happened to be in my line of sight when reading the replies. Seems to be holding well so far

It'll only take a half hour or so to finish off putting the top wing on and ensuring everything is as lined up and symetrical as possible. Then the maiden!

But now it's down tools and off for the rest of the week for a trek around some of the rugged coastline of Cornwall so wont be finishing off until next week.

Jon
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Old Jun 30, 2015, 08:26 AM
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quick buy a cheap chuck glider and convert it to rc there's some monster lift!
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Old Jun 30, 2015, 02:26 PM
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Very cool project!
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Old Jun 30, 2015, 03:10 PM
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I wanna see it fly!! Very Nice.

Reminds me of some project i started it all with. Some Old guy Used to post here. lol
my version of his plane.
http://www.rcgroups.com/forums/showt...50#post3506004
Bill
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Old Jul 05, 2015, 05:01 AM
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Amazing coastline down in Cornwall and a great deal more rugged to walk than I had anticipated. Took 9hrs to cover 15 miles on our first day! Have calves the size of footballs now!

Got back yesterday afternoon and managed to finish off the SE5a (part 1) in the evening.

Now charged & ready to fly I'm hoping for some calm weather this evening.

Update: wing load calculates out at 2.14 oz/sq ft
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Last edited by deadbird; Jul 05, 2015 at 05:33 AM.
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