40" EPP Leadfeather Yak55 XL

Customers are always asking me "What do I need to complete this kit?"
This page contains all the pieces specifically for building and flying the 40" EPP Yak55 XL.
You will need batteries, a transmitter and a receiver as well.

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Picture of Yak55-XL in flight
The 40" Yak55 XL flying
Photo by Steve Wattenberg

The popularity of the 32" Leadfeather Yak55 is undeniable. The one comment I have regularly heard over the years is, "I wish you sold a bigger version". Well, we listened and have created a 40" 125% version of the plane that satisfies those desires. In doing so we went with a KF4 airfoil (theory) which not only gives the plane great flight characteristics, it also strengthens the wing significantly. We have increased the fuselage thickness to 15mm EPP to strength it and even the tail stiffeners have been increased to 6mm EPP giving the tail great structural support. Be aware, these features have complicated the build (This is not a novice build) and we strongly recommend looking at the instruction pictures and following the steps as they are laid out. The sequencing allows previous steps to dry while performing other steps. The KF4 airfoil (image) complicates the wing building over and above a typical flat foamie. (but the end results are well worth it)

Also, you should be aware that the build uses most of 4oz of Foam-Tac to complete.

Flat Foamie Series 40" Yak55 XL

The link below will always contain the latest instructions which might be more up to date than the paper copy included with the kit. Plus you can click on the pictures and get large color versions to better see details.

EPP Flat Foamie Series Yak55 XL Instructions

The 40" Yak55 XL YouTube video playlist.

A Real Flight model of our Yak55 has been uploaded to the Knife Edge Software site.

The Yak Rainbow
The colors available
Click to Enlarge


Flat Foamie XL Completer
$59.95 each

Quantities Limited.
Completer for the Flat Foamie XL kits
SunnySky X2216 II Brushless Motor (1250kv)
40 amp ESC
4 x 9gram Servos
We reserve the right to make equivalent product substitutions when availability requires.
Picture of the Mini Gremlin/Blufo completer set
Click to Enlarge

GemFan 10x5 Thin E-Prop used on our 40" EPP Extra XLs, Yak55 XLs and 3D Delta XL.

$2.00 each
picture of 
								GWS Props
Click to Enlarge
Flat Foamie Landing Gear
Click to Enlarge

Landing gear for 40" XL foamies.

The landing gear can be used where you have a smooth surface and then is easily removed when you fly where the grass would be an issue.
Flat Foamie Landing Gear
Click to Enlarge

You should be aware that the build uses most of 4oz of Foam-Tac to complete.

Beacon Foam-Tac

An excellent glue for bonding Carbon Fiber, EPP and Depron planes. Can be used to make a living EPP or Depron hinge. Stays flexible unlike foam safe CA. Now available in 2oz tubes (with or without nozzle), 1oz tube or the 6-pack of the 5ml tubes (1.014oz total).

Beacon Foam-Tac (please select size)
$15.00 per 2oz bottle with nozzle,
(Nozzle can be moved from tube to tube)
$13.00 per 2oz bottle without nozzle,
$8.00 per 1oz tube,
$8.00 for a package of six 5ml (Mini) tubes
Quantities Limited.

picture of 2oz Foam-Tac with nozzle picture of 2oz Foam-Tac without nozzle picture of 1oz Foam-Tac picture of 5ml Foam-Tac Minis
Click to Enlarge

Creation date: Wednesday October 30, 2019
Last updated: Friday December 9, 2022

For more information send email to RA Cores

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