+Size VTOL Build Instructions
Introduction
The + Size VTOL is the 2nd in the “Go Big at Flite Fest” series. The idea is to provide a set of reference designs that can be built using locally sourced and inexpensive materials and flown at Flite Fest. These designs either break down for transport, or can be quickly assembled and discarded when the event is over. They are all 8 ft. span or larger and serve to demonstrate a set of build techniques that can be used to create large and inexpensive aircraft of any design.
The + Size VTOL is suitable for intermediate to advanced builders and pilots. The build is not difficult but a general understanding of structures and RC techniques is assumed.
The primary build materials are 1 in. Styrofoam insulation, packing tape, and Velcro, all available from the local home improvement store. Standard RC electronics are used, and all of the electronics are reusable for other projects.
With some care in packaging to prevent damage the + size VTOL can be broken down to a space about 51” x 27” x 8”. Assembly and disassembly time is only about 5 minutes.
This is definitely a build that could be done at Flite Fest in a day, especially as a group build. There is a catch though. You have to build it and fly it at home first, then strip it down to a small pile of parts, less the Styrofoam. The theory is that you can buy the Styrofoam insulation at a local home improvement store after you get to Flite Fest. The one sheet of 4' x 8' x 1" Styrofoam is only $11.
The + Size VTOL requires an inexpensive KK2 Flight Controller (FC) flashed using the OpenAeroVTOL firmware. I have provided 3 parameter sets with different flight characteristics:
Very Easy Mode – Gentle hover with AutoLevel, and trainer like airplane flight, also with AutoLevel.
Easy Mode – Gentle hover with AutoLevel and normal airplane flight characteristics.
Expert Mode – Rate mode for hovering and 3D throws in forward flight.
Specifications
Wing span: 8 ft.
Wing chord: 22 inch.
Wing Area: 2,136 sq. in. or 14.83 sq. ft.
Vertical span: 4 ft. 1 inch.
Vertical chord: 22 inch.
Vertical Area: 1,102 sq. in. or 7.65 sq. ft.
Weight: 5.85 pounds
Recommended CG: 5 ½ in. behind the leading edge (25%)
Batteries: 2 each, 3.3Ah, 3S (11.1V), 1.17 lbs. total (or equivalent)
Motors: 4 each Emax GS2215/09,1180KV (or equivalent)
Propellers: Emax 10x4.5 or APC 10x5.5 for Multi-Rotors, 2 CCW and 2 CW
Maximum Power: 220W per motor, 880W Total
Maximum Current: 20A per motor, 80A Total
Flight Time: 5 to 10 minutes
The + Size VTOL is a “Tail Sitter” which means it takes off and lands vertically. It hovers easily, and in forward flight is capable basic 3D aerobatics. Due to its large size and light weight it is not suitable for flying in winds over about 10 MPH.
The full build article is too long to include here but can be found at this location:
https://www.dropbox.com/sh/w01loi3x99b4fz9/AAAFwPuL9mH5OynW9ug7gTfKa?dl=0
Log In to reply
Log In to reply