BackyardRC

A practical approach to RC planes

F22 Build – Day Two

Last week I finished cutting all of the foam and this past Sunday afternoon I assembled the main airframe. So let’s review.

Step Three: Airframe Assembly

Before gluing down the FK airfoil cut a 45 degree angel on the leafing edges of the narrow forward section. It’s much easier to do now before it’s glued in place.

Staring with the main airframe glue the KF airfoil in place. Focus on aligning the leading wing edges. Any hangover on the wing tips can be trimmed as soon as the glue drys.

The next step is to cut the leading edges of the wing. With a NEW blade cut near a 45 degree angle through both the main deck and the FK airfoil. Use a straight edge for best results.

wing's leading edge

wing’s leading edge

The next step is to attach the upper and lower vertical sections.

something witty

1/2 way completed airframe; we’ll be flying in no time

Once in place start test fitting all of the lower structure. Take your time to make sure everything fits snugly and aligns true.

test fitting the lower deck

test fitting the lower deck

I’ve come to love the zippy 4000 mah 4 cell batteries. The pack a punch, give decent 16-20 minute flight time, and are a good weight for this airframe. So on this build I decided to build a custom battery holder in the main cavity.

custom fitter Zippy 4000 mah 4C placement

custom fitter Zippy 4000 mah 4C placement

Cutting the lower vertical to fit the battery I then build guides for the sides of the battery. Finally I tied it all together with the lower deck.

a little customization goes a long way

a little customization goes a long way

It’s now time to glue the runners and lower deck into place. It’s great to have an extra set of hands to hold it all together. Also don’t be afraid to toque the runners inward to meet the lower deck. This will give you a firm solid fix.

Find some heavy objects to hold it all together and let the rig rest for 10-15 minutes. During this time the glue will harden and set.

Heavy objects help hold everything in place as the glue sets

Heavy objects help hold everything in place as the glue sets

At this moment I took time to cutout the control surfaces on the tail, add some camo duck tape details, and then glued on the verticals. Take a scrap of foam and cut a 60 degree angle to help old the tail verticals in place. Keep this template for future builds.

use scrap foam cut with a 60 degree angle to hold the tail verticals as the glue drys

use scrap foam cut with a 60 degree angle to hold the tail verticals as the glue drys

Step back and enjoy. The final airframe looks great.

finished airframe

finished airframe

Next week we’ll move onto building the motor mount and control surface linkage.

Part one of the build

-Miles

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3 responses to “F22 Build – Day Two

  1. Pingback: F22 Build – Day One | BackyardRC

  2. Pingback: August 8th Recap | BackyardRC

  3. Pingback: NTM Propdrive 28-36 Sized Motor testing | BackyardRC

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