I have made 2 versions of the Acro-Bipe. A 1.8oz version using the RFFS-100 module and a 3.7oz version using conventional GWS components and an Astro Flight "Firefly" coreless cobalt motor.

Acro-Bipe #1 (RFFS-100 version)

Specifications:

This is my converted $10 Acro-Bipe powered by a tiny KP-00 motor and U80 (3x1) prop. The RFFS-100 module provides rudder, elevator, and throttle control at a total Ready-To-Fly weight of 1.8oz! That is close to my original Graupner Micro Taxi conversion but with double the wingspan!

Look for a full write-up on this conversion in S&E Modeler!

Acro-Bipe #2 (GWS & AF Firefly version)

Specifications:

Here is my converted $10 Acro-Bipe powered by the improved 4:1 Astro Flight (AF) Firefly coreless Cobalt motor. The tiny motor fits right into the stock nose of the Acro-Bipe! I used a small piece of masking tape around 1/2 the diameter of the motor to create a snug fit. Now that's an easy motor mount!

My Bipe weighs in at 3.7oz using an 8-cell, 120mAh, NiMH pack. This provides amazing power to the Gunther 5x4 prop at 850mA. The AF ESC for the Firefly has very nice linear control.

I used a GWS R4-P receiver and two GWS Pico servos for elevator and aileron control. My aileron control horns are typical biplane-style that extend to both sides for a future connection option up to the top wing.

The finished bottom reveals tiny carbon rods to help support the fragile ailerons. These were purchased from Air Dynamics.

I used the switch/charger board from one of my old COX Viper projects. I've found that enclosing the battery for a self-contained unit works well on these tiny foam models. I just plug in the charge jack to peak the cells.

The elevator servo fits right in the slot used to anchor the stock rubber band.

Thin white hinge tape was used to help support the elevator that was never removed from the stabilizer. A tiny rod was bent to join the two elevator halves together. The whole stabilizer/elevator assembly was then slid from the rear after making a razor slice in the rudder. The assembly and rudder were then glued with white Elmers glue.

A close-up of the aileron linkage reveals the special servo arm created from 3 seperate arms.

The paint was removed entirely from the bottom wing using Scotch tape. Just press on and peal off, it's that simple! The ailerons were much easier to tape on the top side after the yellow paint was removed.