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Old 12-29-2015, 09:27 AM   #61
Cougar429
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Re: PICA 1/5th WACO


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You could build the firewall/tank tray as a removable unit. I did that with the T/F Harvard and it requires very little extra work, the most effort into building the stand off to place the engine the correct distance forward.

I fabbed both fixed and removable panels using the same method of sandwiching glass cloth between layers of thin ply. Placed between sheets of 1/4 plexi and weighted till cured they come out straight with no excess epoxy.

You can add as many layers and/or glass plies, (basically a "Dagwood") to get the thickness you require. The end result is nearly indestructible.

Here are some pics.

NOTE: Since this one suffers the malady of most warbirds and scale of this era the extra structural weight up front was not a problem as to get it to balance still required some lead within the engine compartment anyway.
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Last edited by Cougar429; 12-29-2015 at 02:29 PM.
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Old 12-29-2015, 12:43 PM   #62
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Re: PICA 1/5th WACO

That is cool. Will have another look but not sure I can do all that in my small scale Waco. Would really have to modify the construction. Got me thinking though. Thanks
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Old 12-29-2015, 02:46 PM   #63
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Re: PICA 1/5th WACO

I recommend prior to assembling the fuselage, cutting out the necessary access for the fuel tank, for rear installation, build a lite ply box in place of the hardwood rails, and using the stock firewall as a template, cut a 1/4 ply firewall to epoxy onto the stock one. Good idea to pre-drill for the engine mounts, etc. If you look back, should be some photos on this thread, if not, let me know, and I'll post some shots of how things look now.
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Old 03-23-2016, 05:59 PM   #64
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Re: PICA 1/5th WACO

Been away from this build for a bit, but got some questions about it. I ended up mounting the servos onto a tray, that sits underneath the cockpit. Still lots of room to do cockpit detail, and both elevator and the rudder servos are easily accessed for adjustment and maintenance. My original plan was to cut a 1/4 in round firewall, to which I'd bolt the engine, and then screw that onto the stock firewall. Too much re-working of what I'd already done, to do that, so went basic. As well, the pitts muffler was interfering with the 1/4"firewall, and I did not want to lengthen the nose, so simply cut out the bottom portion. Firewall was then epoxied to the original firewall, and the fuse formers around the engine rails were opened up to allow rear tank access. 12 - 14 oz tank easily fits inside. Soon as I get the Hollywood Zero and the P-39 done, I'll get this back on the table, and finished off.
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Old 03-23-2016, 07:04 PM   #65
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Re: PICA 1/5th WACO

I did something similar, with the tray fitted ahead of the cockpit. Also added a forward bulkhead to retain the tank and foam. That servo tray hides another plate covering the battery compartment.

There was enough room in the cockpit to fit the remote glow, ON/OFF switch, (a locking toggle from the last of my aviation spares) a flashing LED to show the flight system is live, the charge plug,(wired for the LiFE) and an indicator with pushbutton. The indicator is wired to the battery charge/balance plug and the negative wire only closes with the button. That way it draws no current unless I want to look at the state.

The pilot is velcroed in to allow access and room for the glow adapter. Just found some silk ribbon, so he will sport a scarf this season.

What were your questions?
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Old 03-24-2016, 10:56 AM   #66
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Re: PICA 1/5th WACO

Great build, can tell this is built to last.
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Old 03-24-2016, 12:55 PM   #67
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Re: PICA 1/5th WACO

I always commend anyone with the determination to build Pica, not generally considered for beginners. Takes that and skill to bring what is a box of sticks to the flight line.

They are also very nice scale flyers.
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Old 07-10-2016, 08:16 PM   #68
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Re: PICA 1/5th WACO

I've neglected this bird for far too long, so decided to dust it off, and get to work on the wing struts. I knew the stock ones sucked, so took brass strip, sandwiched with 1/8th basswood, after the struts were bent to shape, and then sanded the airfoil. Once that was done, finished the fuel tank installation, and the battery and ignition switches, mounted those in the cockpit. I also managed to get the ailerons hooked up, the geometry with the offset of the wings is a pain, too much down aileron, and the top ones can lock past center, and not come up. I'll be sure to get my throws set up with some safety margin. Just need to install receiver, and the two battery packs, re-check balance, finish a bit of trim, and this one's done. We also finished Leeann's little Pitts Biplane, from Herr Engineering. Great kit, and a lot of fun, can't wait to test fly!
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Old 07-10-2016, 10:04 PM   #69
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Re: PICA 1/5th WACO

Dave, a little trick I use for aileron differential is to orient the servo arms one notch forward of perpendicular when the servo is neutral. That physically gives you more up than down and I have found it works when both servos are on a common channel where you can't program in what you need.
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Old 07-11-2016, 09:30 AM   #70
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Re: PICA 1/5th WACO

Really nice to read threw. Very nice job and an awesome wife by the sound of it as well. Cheers enjoy the maiden.
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