First engine test in 12' Super telemaster

First test runs of the OS Pegasus FF-240 in my 12' Super Telemaster. Bought the model from a friend as engine test bench. Will fit radials later.

Category:

Science & Technology

Tags:

• Tomas
• Leijon
• 12'
• super
• telemaster
• os
• ff-240
• pegasus
• rc
• model
• r/c
• modellplan
• modellflyg
• plane
• modelflug
• engine
• test

[stopglobalswarming]

The "plop" sound is the engine 4 stroking, meaning at some RPM speeds it is ejecting unburned fuel from some cylinders because it cannot induct enough oxygen to fire it on some strokes.

[TomasLeijon]

@stopglobalswarming No, it's not four stroking. The sound comes from the intake NOT the exhaust. The ploping is actualy a very small backsurge in the intake because of the profile and overlap of the camshaft.

Regards

Tomas

[TestECull]

@stopglobalswarming I'd hope it is four stroking on account of it being a four-stroke engine!

[TomasLeijon]

@TestECull He does not mean "fout stroking" in that way. He is mentioning it in the same way as you can make a two stroke engine four stroke by running it to rich on the mixture. Actually if you have an old english model diesel like a Mills 0.75 or eq, you can even make it 8-stroke! Easily checked measuring the rpm and making a sound analysis.

Best regards

Tomas Leijon

[TestECull]

@TomasLeijon I've never understood why people run glow engines that rich. It murders ABC engines(They don't warm up properly, if at all) and it just fouls the plug on ringed ones.

[TomasLeijon]

You never owned an old english diezel I guess. They have iron pistons and sleeves so you don't destroy anything by running them rich and there are no plugs to foul.

The Pegasus in the film is making the sound from a slight backsurge because of the overlap on the cam in combination with a very low idle.

[TomasLeijon]

I mentioned it regarding the English diezels, like a Mills. You might never have owned one of these. They have Iron pistons and sleeves and they don't bother att all about running rich and of course, there are no plugs to foul.

My Pegasus is plopping from the intake, not the exhaust. It's because of the overlap of the cam in combination with the very low idle. 

[Mrsociedadtica]

POP CORN!!!



[m0dthunder]

I want that for my next rc boat

[Terrorkeks1000]

Lol Mini spark plugs :D

[Guinnie]

sounds like Flubber

if you don't know what I mean watch the movie its is funny

Happy New Year

[thenicedudejay]

that flat 4 engine would fit perfect in a Volkswagen beetle model car :-D

[bogey19018]

my magnum 52 used to make that noise, now it doesn't.

[herbienbrian2]

its just like a tiny beetle engine! :D

[TestECull]

I've always wondered just why someone would want a diesel RC engine. They're so much more finicky than a glow engine and they don't make any more power to say for it.