Kitfox-4 / 1200 Apex Motor Mount: This is a tight fit, but it can be done. Some aft ballast will often be required for proper CG. The Model 4 above is my personal Kitfox-4 / 1200 and what started the Aviation division of BD Turnkey Engines. First by offering the AEM EFI system for the Apex, and now additional items like the Motor Mounts, Secondary Oil Cooling (coming soon), Header (coming soon), etc in an effort to make this project a more “bolt on” experience for others. HUNDREDS of hours of R & D have went into these designs, re-designs, and modifications. ALL of our components are based on ACTUAL flight testing and results.

6.6 lbs

$2200.00 + Shipping / Handling

PURCHASE FORM

All of our motor mounts have been 3D CAD designed and guaranteed to work with our Header (coming soon) and our secondary Oil Cooling / Thermostat Kit (coming soon). ALL tubing material is 4130 Chromoly Steel, LASER Cut & Notched, and Professionally TIG Welded. The design has been G Load Tested to 1.5x (6 G’s) - See Video at top of this page!

Scroll through the pictures of each motor mount below. You can Right Mouse Click pictures to view full size.

Kitfox 5-7 Apex Motor Mount: The Apex fits in this airframe very easily with room to spare honestly. Bryan Bowen has documented the process very well on his Youtube Channel, “Project Kitfox”. We have designed this motor mount to have very desirable CG with no need to add aft ballast. The cowl is currently the biggest challenge in this installation. There are a few options, but starting with the Lycoming Cowl & Firewall will be the easiest.

7.6 lbs

$2200.00 + Shipping / Handling

PURCHASE FORM

All of our motor mounts have been 3D CAD designed and guaranteed to work with our Header and our secondary Oil Cooling / Thermostat Kit. ALL tubing material is 4130 Chromoly Steel, LASER Cut & Notched, and Professionally TIG Welded. The design has been G Load Tested to 1.5x (6 G’s) - See Video at top of this page!

Scroll through the pictures of each motor mount below. You can Right Mouse Click pictures to view full size.

Motor Mount Building

I regularly get asked if we will build 1-off / custom motor mounts. Unfortunately we don't. Simply because it's more involved & costly than most realize to build a mount of this caliber. Besides the initial design time for the mount itself, there is design time & cost for the fixture. This really doesn't become economical from a business perspective until you will be making 10+ mounts. Our laser cutter has 5 each minimums to begin with. We have 2 shipping costs before the mount is even built. From the tubing supplier to laser cutter, then from the laser cutter to us. Like anything reduced cost comes with scaling and there just isn't enough volume in any of the Yamaha components to reduce cost by scale. Therefore the only way for a home builder to reduce cost is to build themselves. But here is how we do it to put Yamaha's into Kitfox Aircraft.

Load Testing

VIDEO: G-Load Test Fixture.

Note - 1: This video is after several cycles, returning to 1G (0 Deflection), and repeating. Motor Mount always returned to 0 Deflection, within a few thousands of an inch!

Note - 2: This was a “Pre Production” mount with Main Tubes being 1” x .047” and all other tubes .5” x .035”. To add an additional factor of safety ALL production Main Tubes have been increased to 1.125” x .058”, and all other tubes increased to .625” x .035. In addition the Engine Mounting Tabs were increased from .070” to .100” and more recently increased to .125”.

The Zenith 701 Apex Motor Mount has been 3D CAD designed to replicate the original specified weight and balance as well as P-Factor Right Offset. This mount uses larger 3/4” 4130 Chromoly support tubes. It also includes the float mounts.