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-   -   $100 Twin Build Contest Batplane (http://www.Wattflyer.com/forums/showthread.php?t=73587)

fhhuber 04-19-2014 05:11 AM

$100 Twin Build Contest Batplane
 
http://www.wattflyer.com/forums/atta...0&d=1397530097

Going to design as I build with the PDF (provided by DEG) as the only part of the design I didn't do on my own.

Plan is:

Build a small flat plate based glider to experimentally determine CG (scrap card stock)

Cut the bat symbol and vertical stabs from 1 inch pink insulation foam.
Cut parts to make the fuselage "box" from scraps of the pink foam.
Insert 1/4 inch dia fiberglass (bike pennant) rod as main spar and possibly other reinforcements to keep the wing stiff.
Place the EDF units, servos and electronics to get appropriate CG
Build ducts around the EDFs (probably a couple of styro soda cups involved here)
liberal use of knife and sandpaper to finish shaping.
Cut in the control surfaces and hinge them
Add landing gear.
Pray that battery placement gets me back on CG :p> :eek:
Spray paint and fly.

Actually not starting yet...
I am spearheading (herding cats would be more organized) our local club's participation in a full scale airshow with RC model demonstrations 2-4 May.

thepiper92 04-19-2014 06:08 AM

Good idea for a build, how large is it going to be?

fhhuber 04-19-2014 06:21 AM

1400 mm span, appx 680 mm length

Twin 70 mm EDFs on 4S (4000 to 5000 mah tested to be appropriate for about 4 min flights using these fans in the plane they came from)

thepiper92 04-19-2014 06:31 AM

The size of planes I like :) Not too cumbersome to carry, yet handles the wind well. Good luck with the build, really want to see how it turns out.

solentlife 04-19-2014 06:34 AM

Interested to see how you lay it out ... ie control surfaces etc.

It's an interesting concept and one that is making me consider dropping my TU144 and choose something else more 'interesting' !!

Watching with great interest !

Nigel

Larry3215 04-19-2014 04:35 PM

Looking forward to this one :) Ive done a Bat Car and Bat Boat in depron but not an edf version. Twin edfs will be very cool!

pmullen503 04-19-2014 07:46 PM

Subscribed!

solentlife 04-19-2014 08:53 PM

Quote:

Originally Posted by Larry3215 (Post 945898)
Looking forward to this one :) Ive done a Bat Car and Bat Boat in depron but not an edf version. Twin edfs will be very cool!

I live by the river with quiet stretch of it for my yacht ... and I think often about building a model boat in foam ...

I used to run model boats ... Veron Police Launch with OS 10, MFA Spearfish with Merco 60, County Class Destroyer with twin electrics etc. when I lived in UK.

Sorry back to Batplane !!

Nigel

Larry3215 04-19-2014 09:07 PM

1 Attachment(s)
I should have mentioned that the Bat Boat is a flying boat - along the lines of the Hydro craze from a few years back. Best (or worst) of both worlds :) The Bat car flew too, but the boat was way cooler and more fun.

http://www.wattflyer.com/forums/atta...1&d=1397937905

(sorry for the hijack!)

CHELLIE 04-20-2014 04:10 AM

This will be a cool Build :ws: Subscribed :ws:

Wrongway-Feldman 04-20-2014 04:54 PM

Looking forward to seeing this one come alive

fhhuber 05-12-2014 07:21 PM

Just bought the "pink" (its purple) foam... $16 for a 4 ft X 8 ft sheet. I'll use slightly more than half of it.

riverrat 05-12-2014 11:30 PM

Subscribed.

crispy 05-14-2014 05:04 AM

This is the 70mm edf bat wing i made it's just one of many of my creations. http://youtu.be/IRvvjODJFSo http://youtu.be/amU8ZoXk0cI http://youtu.be/ImayqHO5UyI http://youtu.be/83kNO4aaYxE http://youtu.be/QFrOlS_nDAs

thepiper92 05-14-2014 05:26 AM

That flies great. Doesn't take long to get up to speed either.

fhhuber 05-17-2014 03:48 AM

1 Attachment(s)
OK..

Step 1: Print reduced scale bat symbol and make a test glider to get ballpark for CG.

This worked REALLY well. One rough guess at CG and I had it gliding across the room. :D Stuck a screwdriver that came with a Dynam ARF in as the nose weight.

And there's the 70mm EDFs that will go in the big one. I also plan to install retracts. [popcorn]

(Still just $16 spent so far)

fhhuber 05-17-2014 04:44 AM

Got the tiled printout for the big one.... 24 sheets of paper :p

I cut the small one out on my bandsaw. The big one won't fit. Cutting it out will take a while.

xmech2k 05-17-2014 03:47 PM

Holy overkill Batman! (Ok, I realized that's your chuck glider next to those 2 edf's as I was typing that, but someone had to do it! )

fhhuber 05-17-2014 09:16 PM

Been playing around more with the chuck glider... added verticals and shaped the plate to give it some reflex. Now it can be tossed for a flight across the front yard.

CG might not be ideal since it goes through a stall-dive sequence. Or maybe I have too much reflex. It should be controllable if I put a micro RC system on it, so close enough.

Trying to piece together the 24 sheets for the big one... is a pain. I think I'll go to a drafting company and have them print it.

Larry3215 05-18-2014 01:47 AM

Kinkos will print pdf's to any scale you want. Prices vary a LOT from one store to another, so its worth calling around first. I printed some plans a year or so ago that was about 36" x 42" for about $3/page. I was quoted anywhere from there on up to $12/page.

Bill G 05-20-2014 03:24 AM

Quote:

Originally Posted by Larry3215 (Post 945948)
I should have mentioned that the Bat Boat is a flying boat - along the lines of the Hydro craze from a few years back. Best (or worst) of both worlds :) The Bat car flew too, but the boat was way cooler and more fun.

http://www.wattflyer.com/forums/atta...1&d=1397937905

(sorry for the hijack!)


I wouldn't call that a hijack. Looks really cool Larry!

The contest project also looks like it will be really interesting.

Quote:

Originally Posted by fhhuber (Post 948595)
Trying to piece together the 24 sheets for the big one... is a pain. I think I'll go to a drafting company and have them print it.

Yeah 24 sheets is about my limit. Done that more times than I care to think about!

fhhuber 05-29-2014 11:26 PM

Not really working on it much...

Located the styro cups to use for EDF efflux cones. $1.50 for a pack of 20. I'll use 2.
Stacked all of the servos and such in a pile.
That's about it so far.


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