This model uses my knowledge of the real aircraft and design and building my homebuilt. You will notice I use real aircraft materials, spruce, foam, epoxy and balsa. I used programs to calculate the wing spar and servo requirements at 75 mph. The main spar is good for minimum of 15 G’s at a wing loading of 32 ounces per square foot and 10 G’s at a loading of 48 ounces.
The Aerostar is about the fastest piston twin even at more than 50 years old. Ted wanted it fast and used the low drag 64A212 airfoil, no twist wing and no side or down thrust for the engines. I use the same 12% airfoil at the cost of a heavier main spar.
The model is not easy to build, because of the center section having to be built in. Below the center section has the gear retracting into the fuselage, AND above are windows.
scale version shown with pilot and "back seater" on board.
by Stan Burak
Plans Specifications:
Specifications: Ted Smith Aerostar 1/4 Scale
- Scale: 1/4
- Inches to the foot: 3" - 1'
- Length: 104"
- Weight: 33-37 lbs
- Wing loading: 43-50oz/sqft
- Wing area: 1708 sq.in
- Wing span: 110"
- Wing incidence at root: +1°
- Stab incidence: +0°
- Dihedral: 2.3" under eacg wing tip
- Power:Twin 35-50cc gas
- Washout at wing tip: none
- Aileron throws: +15° , - 25°
- Elevator throws: 30° up, 10° down
- Rudder throws: 30° left and right
- Flap degrees down: 45°
- Cowl length: 9"
- Cowl height front: 5"
- Cowl height rear: 6"
- Cowl width front::9.5"
- Cowl width rear: 9.5"
- Engine offset degrees: Both engines 2° outboard
- 25% CG Location: 4.25" back from leading edge of wing at the fuse
- Requires:
- Fiberglass Cowls and windshield available from https://giantscaletwins.com/aerostar
- Kit: Laser Cut kit available from https://store.laser-design-services.com/index.php?main_page=product_info&cPath=7&products_id=370
- Fuel tank: 16 oz rectangle
- Control Horns:
- Hinges: 4 Robart #345 Fowler Flap hinges, 12 Robart Large hing points
- Covering: Fiberglass cloth and resin
- Nose gear strut: Robart 638HDRS retract, 674 Fork strut
- Main Gear:635RS main retracts, (2) 680 struts
- Wheels Main: 4.5"
- Wheels nose: 4"
- Radio channels: 6 or more
- Servos: Flaps (1)400oz MGBB, Ailerons (2)100+oz MGBB, Elevators (2)100+oz MGBB, Rudder (1)120+oz MGBB, Gear (1)50oz, Throttles (2)50oz BB
MG-metal gear BB-ball bearing