Glow to Electric Conversions Discuss glow/gas conversion to electric here.

87inch Vailly Aviation Birddog conversion to Electric

Reply

Old 05-27-2011, 11:27 AM
  #1  
tenacious101010
Senior Member
Thread Starter
My Feedback: (97)
 
Join Date: Sep 2004
Location: Tampa, FL
Posts: 1,653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 87inch Vailly Aviation Birddog conversion to Electric

I purchased an 87 inch wingspan Vailly Aviation Bird Dog that was gas powered and I want to convert it to electric power. The plane with electric motor, speed controller and 2 5000mA batteries weighs in RTF at 21 pounds. The motor, I had on hand already and want to try to use it. On the side is a sticker that says 4130-18, and nothing else. Not sure where the motor came from or any specs on it but if anyone knows where it can be purchased or any specs on it, I would appreciate any info available. The motor, with a 20X10 prop is only turning 3,500 RPM. Iknow I need more RPM and will try a 6 cell lipo next and maybe swap out the prop. Any ideas would be a big help. I am new at electrics and realize I need to do some calculations to figure this out. Heres a few pictures of teh project.
Denny
Attached Thumbnails Click image for larger version

Name:	Pn37136.jpg
Views:	17
Size:	117.1 KB
ID:	1615300   Click image for larger version

Name:	Om32820.jpg
Views:	17
Size:	77.9 KB
ID:	1615301   Click image for larger version

Name:	Nl29387.jpg
Views:	21
Size:	130.6 KB
ID:	1615302   Click image for larger version

Name:	Hf98783.jpg
Views:	24
Size:	80.2 KB
ID:	1615303   Click image for larger version

Name:	Li21158.jpg
Views:	23
Size:	89.0 KB
ID:	1615304   Click image for larger version

Name:	Sq48190.jpg
Views:	22
Size:	93.2 KB
ID:	1615305   Click image for larger version

Name:	Ki19731.jpg
Views:	26
Size:	128.3 KB
ID:	1615306  
tenacious101010 is offline  
Reply With Quote
Old 05-27-2011, 12:11 PM
  #2  
normgoyer
Senior Member
 
Join Date: May 2006
Location: Apple Valley, CA
Posts: 854
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 87inch Vailly Aviation Birddog conversion to Electric

I have a 4130 which is a Axi from Hobby Lobby and in my opinion it is an excellent motor but one size too small for the Bird Dog, look for 53 series which will do the trick, Axi and many others make a 53 series. Norm
normgoyer is offline  
Reply With Quote
Old 05-27-2011, 06:21 PM
  #3  
blvdbuzzard
 
Join Date: Jun 2002
Location: high deserts, CA
Posts: 3,701
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 87inch Vailly Aviation Birddog conversion to Electric

I was curious about this. I looked at a Monster Power 160 with a 20X8 prop on 10s. It gives about 280 ounces of thrust. I played around with the calculator for a bit. If I use a 19X10 prop, 10s battery it gives out 301 ounces of thrust and just over the max amp draw of the motor. So these would be to small for what you have. Best I could with the MP 160 was 18 pounds of thrust. It says it has a burst current rating of 78 amps. If you did that it would be about 20 pounds. That is a little lite for power.

Here is the calculator I was using.

http://www.s4a.ch/eflight/motorcalc_e.htm

Motor

http://www.hobbypartz.com/mo1602brmo.html

I was looking at the Turnigy line of motors. I found several that might work for you.

http://www.hobbyking.com/hobbyking/s...idProduct=2097

This motor running 8s battery 22X10 prop says it will pull 377 ounces of thrust.

So there is a start for you.

Hope it helps.

Buzz.
blvdbuzzard is offline  
Reply With Quote
Old 05-27-2011, 06:30 PM
  #4  
tenacious101010
Senior Member
Thread Starter
My Feedback: (97)
 
Join Date: Sep 2004
Location: Tampa, FL
Posts: 1,653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 87inch Vailly Aviation Birddog conversion to Electric

Thanks Buzz, thats great info. I really appreciate the help. Since the motor is already in the plane, we are going to do a bit of experimenting on it tomorrow.
Denny
tenacious101010 is offline  
Reply With Quote
Old 05-27-2011, 06:32 PM
  #5  
tenacious101010
Senior Member
Thread Starter
My Feedback: (97)
 
Join Date: Sep 2004
Location: Tampa, FL
Posts: 1,653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 87inch Vailly Aviation Birddog conversion to Electric

Norm, I looked at the 53 series, the numbers look so much better for that motor, thanks.
Denny
tenacious101010 is offline  
Reply With Quote
Old 05-28-2011, 06:44 AM
  #6  
blvdbuzzard
 
Join Date: Jun 2002
Location: high deserts, CA
Posts: 3,701
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 87inch Vailly Aviation Birddog conversion to Electric

After some rest. I was looking and found a motor that may be close to what you have.

http://www.hobbyking.com/hobbyking/s...idProduct=4913

I used the calculator to see what it might do.

With a 6s 5000mah battery, APC 20X10 prop says it will have 236 ounces of thrust at 66 amps and 1330 watts.
With the same setup but with a 24X10 prop says it will be right at 100amps, 315 ounces of thrust and 1937 watts. The amps are just over the max rated for the motor and the max watts are just over the top too.

If I used the AXI 4130 motor listed in the calc program, using a 5s battery, 20X10 prop I get 222 ounces of thrust, 70 amps and 1189 watts. With a 6s battery I have to drop down to a 18X10 prop and I get 243 ounces of thrust and 1420 watts.


Using the calculator makes it easier. Before I found it, I let the magic smoke out of a lot of stuff. Once the smoke is out, you can never pout it back.


Buzz.
blvdbuzzard is offline  
Reply With Quote
Old 05-29-2011, 08:15 AM
  #7  
tenacious101010
Senior Member
Thread Starter
My Feedback: (97)
 
Join Date: Sep 2004
Location: Tampa, FL
Posts: 1,653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 87inch Vailly Aviation Birddog conversion to Electric

Thanks for your help. Tried to fly it, but the power wasnt quite enough. I plan on ordering a bigger motor and giving it another try. I think I will put the motor thats in it now into a 60 size Chipmunk, that should pull it well.
Denny
tenacious101010 is offline  
Reply With Quote
Old 06-12-2011, 10:22 AM
  #8  
tenacious101010
Senior Member
Thread Starter
My Feedback: (97)
 
Join Date: Sep 2004
Location: Tampa, FL
Posts: 1,653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 87inch Vailly Aviation Birddog conversion to Electric

I found and ordered the new motor for this project. It will have a lot more power. I am not ready to order the ESC yet but at least I can get the motor mounted and get the battery supports built. Heres the link to the motor.

http://www.hobbypartz.com/mo1602brmo.html
tenacious101010 is offline  
Reply With Quote
Old 10-29-2011, 02:32 AM
  #9  
tenacious101010
Senior Member
Thread Starter
My Feedback: (97)
 
Join Date: Sep 2004
Location: Tampa, FL
Posts: 1,653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: 87inch Vailly Aviation Birddog conversion to Electric

I finally got the Birddog into the air. I is powered by a power 160 from Hobby partz, 10 lipo cells and it had plenty of power. The plane is a bit heavy but still flies well. It flies something like a big Piper Cub would.
tenacious101010 is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service