Stroke: 0.631"

Capacity: 2.47cc

Weight: 148 grams

Exhaust opens: 142 deg  

Boost and transfer open: 118 Deg

Inlet rotor opens: 153 BTDC, closes 30Deg atdc

The transfer ports consist of twin opposing and rearward directed Schnürle ports with a single rear upwards facing boost port.  The exhaust exits through a single side exhaust in conventional style in the light die-cast crankcase.

The genuine F2C style push-pull head has been machine by FORA to give almost flat squish.  A drop-in glow head is also included with the engine, and the head contains a spare head gasket.

RPM 17200-17500 on an APC 7x6 sports prop with only 1/2 turn on compression to get tune so its running up just as well as my R250 does on the same prop.

It comes with a well made of hard plastic 3.8mm diameter 5 hole peripheral venturi , with an anti-spitback stack in the more recent engines , which is about right for Classic FAI or Vintage Combat.

Using Timmy Tigre fuel*, 1.4 IPN at 15C the engine started and ran first flick after minimal port priming and 4 drops in the venturi, about 2.0 turns open on the needle.

When bolted into Andrew's Classic FAI model performance was great, the model did 23.8 -24.5 sec/10 laps for 38-42 laps using a completely stock APC 7x6 Sports prop.

CHOOSING A BLADE: PROPELLOR TESTING DATA

Download FORA 15D Junior Propellor test.pdf

Suggested Fuel Formula

*15% BeNol

35% Diethyl ether

50% JetA1

1.4%* Isopropyl nitrate

           (*at 25C)