CGB3

CGB3's Activity

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   CGB3 added a post in a topic Avid IV 912 engine conversion    3 May 2023

   Here is the ring mount. I’ve talked to a few guys and generally the engine has a right angle of approximately 3 deg (2.8) on the Kitfox mount as is. Also there should be a similar angle downward to prevent abrupt nose up attitude when full power is applied in the air. So major mods to the Kitfox mount are required. I have made a template of the firewall mount points and will rework the engine mount from that for 912. In the mean time I’m going to reinstall the 582 and see if the plane is worth putting the 912 in. 
   Jeff 
   
   
   

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   CGB3 added a post in a topic Avid IV 912 engine conversion    20 Apr 2023

   Thanks for the info. I am sorting through the posts.
   Yes I am worried about the CofG. Where is the datum point (11.2-16”) measured from?
   That is why I’m looking for the builder manual and weight and balance info. It is obvious to me that the mount I have will have to be modified. The thrust line of the engine is my biggest question as there should be an offset to the right which the mount has of 2.8deg but if I were to make attach points on the firewall as it came, the angle of the engine will point down 15.5deg?? So I bought a Kitfox mount hoping it would work with the Avid but…no.
   So is there any known thrust line angles for the MK IV and a 912 and where is the CG supposed to be are what I’m looking for.
   I also am changing the gear to Grove spring gear and moving them forward to complicate things further but hopefully help ground handling.
   Thanks Jeff
   

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   CGB3 added a topic in Avid Model IV    19 Apr 2023

   Avid IV 912 engine conversion

   Hello all, I’m new to these forums so a bit of background. I fly trikes and also have an advanced ultralight called an Aerostar Festival R40 with a private license in Canada. I have some engineering background but it’s been 40 years since I was in school.
   I recently purchased a badly ground looped Avid IV Heavy Hauler and am slowly straightening out the fuselage. While looking for info etc. I found a 912 Kitfox engine mount with the Rotax ring and I have a 80hp 912 from a trike. None of the mount points align so it needs to be modified. I have no idea how the 912 engine should be placed and if there are offsets and angles that need to be incorporated into the thrust line and where that line should be. 
   I see the manuals that someone has downloaded here on the forum and have printed them up but there is no weight and balance section so I’m looking for a more complete builder’s manuals for the Avid. 
   If anyone is willing to pass on some of their experience and has a manual I would be greatly appreciate it.
   Thanks, Jeff 
   Picton, Ontario 
   
    
   

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