Colin's Radio Control

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Wot 4 Mk 3

  

 HardwareComments
Type: High wing aerobatic  
Source: Chris Foss kit.  Converted to electric. Summer 2023
Material: Balsa  
Wingspan: 1420mm  
Length:  1190mm  
Take off weight:  2018g  
Controls: Ailerons, Elevators, Throttle, Rudder  
Receiver: ELRS - MatekSys R24-P  ID 53
Battery: 4S 2600mAH  
Motors:    Was OS Max 40 FP before conversion
Propeller:    
HD Camera  N/A  
FPV Camera  N/A  
Landing gear  Fixed   

 

 

After trying a few prototype motor mounts I eventually refined the mount design and made a final mount.  The protorypes were made from balsa for quickness but the final mount is made from 6mm ply and spruce.

Wot 4 electric conversion, motor mount prototype 1 Wot 4 electric conversion, prototype motor mount 1 with cowl fitted. Wot 4 electric conversion, final motor mount.

As the wing on the Wot 4 takes a bit of time to fit and remove, and as there was a hole in the fuselage where the receiver on / off switch was, I decided that I would fit an external battery switch. Unfortunately 60 amp switches proved to be too heavy and  bulky so I fitted a mounted external XT60 connector and brought an XT60 battery extension lead out through the existing hole.  This now allows me to connect up the 4s 4000maH battery and fit the wing before powering up the model.

Wot 4 electric conversion, external battery connector.

The only things left to do are to work out the positioning of the battery to achieve the proper centre of gravity and make the battery mount. The initial indication is that with the battery located just in front of the leading edge line the CoG is spot on.

Wot 4 conversion, almost finished.

 

I have decided to convert the Wot 4 to electric power.  I have a spare motor and 60A ESC.

My initial look at the physical motor size, old engine size etc. indicate that I might be able to just make a suitable adapter and mount the electric motor using the original nitro engine mount.

I will upload photos and add articles as I progress...

 

The rebuild of the Wot 4 is now complete.  Just need to wait until the better weather in the spring to see if it flies OK.

 There are pictures of the rebuild in the gallery.

I have eventually got around to starting the rebuild of the Wot 4.  I have been taking pictures throughout the rebuild and I will be uploading them when the rebuild is complete.

For the meantime here is a picture of it before the crash:

Wot 4 before crashAnd after:

 Wot 4 after crash

 

Note: This article is intended as a reference for myself to balance my Wot 4.  I have taken the information in it from various sources including the Wot 4 Mk 3 build instructions and as such should be accurate. However, if you use the information in this article (as with any article on this website) you do so at your own risk.  I take no responsibility for problems, accidents, issues etc. from using information from here.

 

  • CoG: 3.25" back from leading edge of wing ± .25"
  • Balanced with top of fuselage level.
  • Lateral balance with plane upside down suspended from crankshaft and tailskid.
  1. First flight

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