** PIRANHA! ** - 43" fff/monoblock/kfm4 aerobat - Page 63 - RC Groups
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May 18, 2017, 08:23 PM
I meant to do that. Honest!
JamesPotts's Avatar
I put them both in the tail just ahead of the stabilizer LE. I placed one on each side and one of them is aft of the other so they don't touch each other. There wasn't enough room inside to have them at the same distance. I looked at some of the pics in the thread to see approximately where other builders put them and that seemed to be the most common place. I will place the battery wherever it needs to be to balance the craft.

I've spent some time this afternoon peeling the plastic coating from the PB3 parts that will be covered. I've found that if I leave it on there is a big problem with air bubbles in the covering. I don't think I will try to cover another model built from PB3 with iron on covering. The plastic coating is too hard to peel off. It comes off in very small pieces so it takes a lot of time to remove it.
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May 19, 2017, 05:32 AM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
Thanks, I cannot remember anything about mounting them. I guess it was just TLAR- I guess I eyeballed it and got them right. I do remember now the servos were offset.
I haven't completely exhausted my search for the control surface rods, that would have given me a good idea. Not sure I'll find them.
May 19, 2017, 05:34 AM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
BTW the battery compartment was per the location in the plans and the airplane balanced perfectly with a 3S 1500 mah.
May 20, 2017, 05:06 PM
I meant to do that. Honest!
JamesPotts's Avatar
I haven't been doing much recently. I'm on a new medication and it's kicking my butt. Anyway, I got the wing covered. This PB3 foam is too problematic for iron on covering so next time I build with it I'll use tape or paint. This is likely to be the worst covering job I have ever done. I'll save the covering for MPF, DTF, and balsa models from now on.
May 20, 2017, 06:37 PM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
Sorry to hear about the med issues, no fun at all.

Today I glued the fuselage sides onto the monobloc and glued in the top aft wedge. The merge at the tail came out well. I used some tape for reference marks to get it right. I'll work from underneath to run wiring for the servos and get them installed before gluing in the bottom.
May 20, 2017, 09:23 PM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
I may run with some eggshell latex. One of my flying buddies got samples from Home Depot matched to paint over a repair and it looked great.
May 21, 2017, 05:19 PM
I meant to do that. Honest!
JamesPotts's Avatar
I hear a lot of people are using latex house paint now. I'll have to try it next time I build. I've been using acrylic artist paints thinned with Windex. It works well but the ammonia tends to lift the edges of the tape hinges slightly.

No wind this morning for the first time in weeks so we went flying. I had a very good day, Lots of fun and no crashing. Can't wait to fly this Piranha.
May 25, 2017, 10:25 PM
Registered User
JohnsPop's Avatar
Quote:
Originally Posted by JamesPotts
This is likely to be the worst covering job I have ever done.
Well looks pretty good in the photo. Bet you notice any problems in the air either. Let 'er rip.
May 25, 2017, 10:29 PM
Registered User
JohnsPop's Avatar
I use those Apple Barrel or Apple Crate or whatever they're called paints from Walmart and just thin them with water. I either brush them on or air brush them with a cheap Harbor Freight airbrush. I hit it with a heat gun to dry it held at a distance and I can have a coat of paint dried in 4 or 5 minutes.
May 26, 2017, 09:50 AM
I meant to do that. Honest!
JamesPotts's Avatar
I've been looking for a foam safe paint that can be air brushed. I will try your suggestion.
May 27, 2017, 07:50 AM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
Not sure what I'll do for paint, I may just lurk at HD and Lowes for some latex mixed up and on the closeout rack, or just bite the bullet and have them mix up a sample.

Haven't made a lot of progress recently, still recovering from a trip to Atlanta... two hours to get out of the metro area Thursday evening... I don't know how people deal with the traffic every day, I guess you get used to it.

I have the fuselage joined in the back, still need to finish up the mounting for the tail wheel. Using the same approach as the original build, I will post some pics. Still need to pick up a 30 amp ESC.
May 27, 2017, 11:01 AM
I meant to do that. Honest!
JamesPotts's Avatar
I haven't made much progress either, still trying to adapt to my new med, but I did manage to cover the fuselage last evening. Just the tail feathers left to cover and I'll be ready for final assembly and radio installation.
It looks like I will not be able to do any flying for a few weeks. There is a wild fire burning a few miles from my home and the fire crews have taken over the county fairgrounds as a base camp. Since that is where we fly and the only place within 50 miles that is flat and cleared of brush and boulders we will have to wait until they get the fire contained before we can do any flying. The Piranha maiden flight may be postponed temporarily.
May 28, 2017, 04:01 PM
A Day @ a Time - Matt. 6:25-34
ruff1's Avatar
Got more stuff done, receiver, rudder and elevator servos installed, aft top and bottom glued in. The supporting structure for the rudder and horizontal stabilizer installed.

I'm handling the rudder a bit different that the stock plans; once I get it mounted i will post some close up pictures with a description.

Ordered a 30 amp ESC with a switchmode BEC today for this bird:
http://www.headsuphobby.com/Sky-Powe...EC_p_1867.html
For a bit over $15 it looks like a good deal. HURC is my go-to place for most electrical stuff. Only one problem and they resolved it quickly.

Once the ESC arrives there won't be much left to get her airworthy. I may put her up before I paint.
May 29, 2017, 05:32 PM
I meant to do that. Honest!
JamesPotts's Avatar
Looking good! All I have left to cover is the elevator. I'll do that this evening then I'll hinge it and glue the stabilizer in place and hinge the rudder. I'll see how much I can get done tonight and I'll try to post some pics tomorrow.
May 30, 2017, 12:58 PM
I meant to do that. Honest!
JamesPotts's Avatar
Ready for radio gear. I still have to add the SFGs to the wing tips.


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