Nigel R

Hello all I've inadvertently ended up with some Robart units (the 1/8" OD tubing, air up/spring down) and some 4mm OD tubing control clobber. The 4mm stuff looks like the black horse clobber (but is some old Eurokit stuff). I guess I simply need some way to convert between the two tubing sizes - does such a widget exist? Clearly the easy option is to buy the Robart control gear bundle, but this seems an expensive answer...

Covering. Have to force myself to start. Whatever method I'm using. I'm fine with woodwork and kit install.

ED, Eneloops are gold standard, as RX batteries are a single point of failure, I spend out on the best here. Of course, options exist to have multiple packs with failover type setups, but the best option is almost always a simple setup with reliable parts. Plus, Eneloops seem to have good shelf life. Anywhere stocking ripmax clobber will carry eneloop packs: http://www.ripmax.com/Item.aspx?ItemID=O-4EN2000AASF&Category=090-010 I expect someone will be along to say how good LiFe or LiPo packs are soon... 😈

Also worth adding; at idle - with the engine running at a vacuum in the intake, there is comparatively little air/fuel charge to be compressed, with a low amount of compression comes a low amount of heating of the intake charge at full throttle - the engine is running wide open, a much larger air/fuel charge enters the motor, thus more compression occurs, and with more compression comes a larger increase of charge temperature the hotter mixture contributes to the advance of ignition "Diesel engines or compression ignition" Technically, glow engines are compression ignition - aided and abetted by the catalyst in the glow plug of course.

I'd only somewhat agree Martin - I've several engines that I've tweaked and tweaked to get "perfect" transition and they've wound up in a slightly different needle setting to the "perfect" idle. It's a balance, as ever. I'd add that carbs with an old or busted O ring are never going to be right, so there's that, too.

Just checked the stats on this, its listed as 61" and 9lbs finished weight. I'd go for a 120 glow four stroke. Plenty on Ebay as a second hand.

As noted above, glow motors often lose RPM at low speed without the driver. If the idle is reliable without it... well, who cares? Worry about nailing the full throttle tuning, and getting idle + transition reliability, everything else is not that important. Just thinking aloud about factors affecting the ignition timing on our glow motors, there are a lot - heat of engine, heat of plug element, element wear, element composition, fuel/air mixture, how well the carb atomises the fuel... adding or removing a glow driver to the mix changes that balance by adding heat to the glow element + advancing the ignition point. Worth noting that automotive diesel engines - which also rely on compression ignition - use direct injection at terrific pressure and can time the injection squirts to affect ignition timing. We have none of that control!

What vapex cells are they? They do "standard" and low discharge types (marked as "instant" i think). Your results look about expected for standard type. Although the variance is quite large. Low discharge are better for our purposes, in my opinion. Those should show 80pc of the rate capacity when cycling at 2C.

Used to? Still do on some of my needles...

Model Technics Laser 5 - is 5% nitro 15% synthetic

Another on fleabay, new SC silencer that will fit. https://www.ebay.co.uk/itm/203005035517

Enya are good motors, but less common, and I think spares may be an issue. Os and saito are far more common. You pays your money etc.

I concur about brand choice, for second hand. End of season, run the engine dry off possible. That's the only after run precautions I ever take. Jons advice is all spot on.

Or use less throttle stick?

I'm just saying what I see Simon; I agree entirely with what you say. Everyone wanted ARTF, so we had ARTF, now ARTF is too expensive for a lot of people and the volume goes down. ARTF were very cheap, artificially I suspect (because various global/political factors which have now changed), and now they are not cheap, and shifting in lower volumes. I agree, a similar problem, but market forces are what they are. Balsa and glow? Perhaps, liteply and petrol. Times change. None of us can predict the future. It will not be so bleak as all that. Just... different. Maybe in 10 years, turbines will cost 1/2 what they do now... 10 years ago, a foamie jet with a tiny turbine was still sci-fi.