Originally Posted by Reginald
Never had any trouble with my onboard glowdrivers and the idle of my OS 4cyl 240 is magnificent WITHOUT an onboard. As for fuel economy that's an issue I have never understood and the very least of my modelling expenses, but I suppose you guys do fly day and night ? Fourteen litres in my 911 when driving moderately, now thàt's fuel consumption. But please do not let me stop you guys fiddling. But when I want to fly ignition I go for Zenoah or DA or Seidelwhatever purpose made engine.
All but 1 of my converted engines is 1.50 or larger uncluding 2.00 & 3.00 twins.
When fuel consumption is approaching 3oz per minute W/GI on the larger engines, 23% longer run times on a tank of fuel can add up.
As far as 2-stroke gas engines? They don't sound anything like full scale engines. The large single gas ebgines vibrate a LOT & make less power per displacemnt/weight than a 4-stroke running methanol on CDI.
My high compression 180 W/methanol/CDI makes 3.4 HP @ 8400 RPM W/an 18 x 8 prop. It weighs just over 2# including the ignition system.