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Old Aug 01, 2011, 09:51 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
United States, CO, Aurora
Joined Nov 2007
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87" DynaFlite PT-19 Electric Conversion

I acquired my Dynaflite PT-19 a couple of weeks ago.
A friend gave it to me.
This old girl was kind of ruff, but I saw some potential.
I built a "Drawer" type motor mount for batteries.
If you can imagine an electric motor mounted to the front of drawer
that slides in and out.
I had a huge Hyperion Z5045-16 lying around for a long time.
I purchased a 20X10 APC e prop to try it out.
The plane was missing a cowl and wing fillets, so I had to make them.
In the last few days, I painted the fuselage, covered half the wing
and added the servos, and wired her up.
Pretty close to flying condition now, just waiting on my three
Gens Ace 4s 30c 5300mah for a total of 12s to show it in a few days.

If anyone else is interested in Big Electric conversions or PT-19's,
Please feel free to post here.



.
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Old Aug 02, 2011, 11:16 AM
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Zipman's Avatar
USA, NJ, East Brunswick
Joined Nov 2003
76 Posts
wingspan100,

That PT-19 is lookin good. Great job. Could you post some pictures of your "Drawer" motor mount for the batteries. Always looking for new ways to do things.

Thanks
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Old Aug 02, 2011, 11:29 AM
Lookout For The!Radio Silence.
wingspan100's Avatar
United States, CO, Aurora
Joined Nov 2007
5,845 Posts
Quote:
Originally Posted by Zipman View Post
wingspan100,

That PT-19 is lookin good. Great job. Could you post some pictures of your "Drawer" motor mount for the batteries. Always looking for new ways to do things.

Thanks
Sure, In a few days I will have my batteries.
I will disassemble the front end to do the install.
I will post pictures of what I did.
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Old Aug 03, 2011, 12:58 PM
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warhead_71's Avatar
Chicago, IL
Joined Dec 2006
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Slide out battery tray and firewall:
http://www.tnjmodels.rchomepage.com/tnjwaco45.php

T&J Models 1/8 Waco YMF Battery Access (0 min 45 sec)


I am planning to do the same thing when I convert my 1/6 scale Sterling Stearman.

Great looking PT-19... I wish I had friends like yours
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Old Aug 03, 2011, 01:27 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
United States, CO, Aurora
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Yea, that's basically the idea.
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Old Aug 04, 2011, 10:58 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
United States, CO, Aurora
Joined Nov 2007
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Check out these pictures.
Pull two pins and the motor chassis slides out.

.
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Old Aug 05, 2011, 01:50 PM
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Maryland
Joined Oct 2008
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I have mostly Gens Ace batteries now. I charge with an iCharger 3010B. They have the cheaper 6S 1000W charger now. You could run balance extentions and charge them in the plane if you had a deep cycle marine battery to cart around. I do that with a combat plane and I can charge in 15 minutes or less.
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Old Aug 05, 2011, 01:57 PM
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Chicago, IL
Joined Dec 2006
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So you have to remove the cowl to remove pins through the battery tray? I'm not sure how far the battery tray extends into the front cockpit, but you could even add an extension if you had to... then you could pull the pin(s) from the from cockpit and remove the tray with the cowl still mounted. Maybe the joystick itself could be the pin?

P.S. --- I see you have half the batteries in the "drawer" and the other half in the fuselage. It would simplify things if the drawer was deeper to accommodate all 4 batteries. Too late to re-engineer it?

Still, a beautiful plane and I like the drawer pull-out --- don't mean to criticize.
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Old Aug 05, 2011, 02:29 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
United States, CO, Aurora
Joined Nov 2007
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Quote:
Originally Posted by Melnic View Post
I have mostly Gens Ace batteries now. I charge with an iCharger 3010B. They have the cheaper 6S 1000W charger now. You could run balance extentions and charge them in the plane if you had a deep cycle marine battery to cart around. I do that with a combat plane and I can charge in 15 minutes or less.
I heard that Gens Ace batteries were the way to go when it come to quality and price.

I like that! Charger extensions.
Does someone make them?
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Old Aug 05, 2011, 02:38 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
United States, CO, Aurora
Joined Nov 2007
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Quote:
Originally Posted by warhead_71 View Post
So you have to remove the cowl to remove pins through the battery tray? I'm not sure how far the battery tray extends into the front cockpit, but you could even add an extension if you had to... then you could pull the pin(s) from the from cockpit and remove the tray with the cowl still mounted. Maybe the joystick itself could be the pin?

P.S. --- I see you have half the batteries in the "drawer" and the other half in the fuselage. It would simplify things if the drawer was deeper to accommodate all 4 batteries. Too late to re-engineer it?

Still, a beautiful plane and I like the drawer pull-out --- don't mean to criticize.
How did you know I'd have a problem?
You can tell the future? You should be a rich man.
After I took these pictures, I discovered the plane
was much too nose heavy.
Right now, I am redoing the battery tray to go in
deeper and further back into the fuselage.
I am also trying to figure a way to mount the cowl to the tray.
Before I was hoping to keep the batteries lower near the
bottom of the fuselage. Now that I am making a longer tray,
the batteries will sit higher in the fuselage.
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Old Aug 05, 2011, 03:22 PM
Team Wack-a-Mole
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Maryland
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Here is what I'm talking about. Make sure those don't get shorted or pinched. You'd need to get to the battery connectors as well. I"m assuming you'd parallel charge the batteries if they are identical.
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Old Aug 05, 2011, 04:21 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
United States, CO, Aurora
Joined Nov 2007
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Quote:
Originally Posted by Melnic View Post
Here is what I'm talking about. Make sure those don't get shorted or pinched. You'd need to get to the battery connectors as well. I"m assuming you'd parallel charge the batteries if they are identical.
Because the batteries are further in now,
I think I will have to slide out the battery tray
in order to recharge.
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Old Aug 05, 2011, 06:11 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
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Ok, Latest update.
I moved the batteries further back but it was still way too nose heavy.
I took out the batteries and laid them on the belly to find the balance point.
It turns out that the best location for the batteries for balance is over the wing.
Go figure...
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Old Aug 05, 2011, 09:04 PM
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United States, AZ, Queen Creek
Joined May 2004
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What do you mean you have friends?
Are you cheating on the fellas at the flying field?

BTW, Nice PT-19. let us know when she is going up.
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Old Aug 05, 2011, 09:22 PM
Lookout For The!Radio Silence.
wingspan100's Avatar
United States, CO, Aurora
Joined Nov 2007
5,845 Posts
Quote:
Originally Posted by TBolt View Post
What do you mean you have friends?
Are you cheating on the fellas at the flying field?

BTW, Nice PT-19. let us know when she is going up.
Don't be
I was hoping to fly it this weekend,,,,,
If I can finish it.
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