No cut-off...

[Roger Dyke]

Correction: Looking again at our club rules and also the BMFA rules, they both state that if your transmitter has a "failsafe" system available, then it should be used. The action being to "prevent the aircraft flying away in the event of loss of signal". Not to 'kill the throttle' as I stated in one of my previous posts.

 

Thanks to you all for your very useful info.

 

 

 

Edited December 16, 2024 by Roger Dyke

[Roger Dyke]

By the way, my two red/maroon Irvine engines both have “Made in England” written into their casting.

[Peter Jenkins]

3 hours ago, Roger Dyke said:

Correction: Looking again at our club rules and also the BMFA rules, they both state that if your transmitter has a "failsafe" system available, then it should be used. The action being to "prevent the aircraft flying away in the event of loss of signal". Not to 'kill the throttle' as I stated in one of my previous posts.

 

Thanks to you all for your very useful info.

 

 

 

My understanding is that it is more than "should" it is a mandatory specifically to prevent flyaways.

[GrumpyGnome]

Indeed, section 3.12 says failsafe must be set if available....... but does say minimum is to reduce engine to idle......

[Roger Dyke]

Quoted from the BMFA handbook:-

 

"and make sure that wherever available, a failsafe is set to prevent the aircraft flying away in the event of loss of signal"

[Cuban8]

Not forgetting that an  electrical failure in an IC powered plane will result in a dead radio and loss of control of engine throttling. More sophisticated models can get around this scenario to some extent but for the conventional sport and scale stuff that most of us fly, a disconnected battery or O/C receiver switch will leave the engine running at the last commanded position (chances are not at idle) with the throttle servo 'frozen' along with all the others.

Who knows where a model gone 'free flight' could wind up in that situation? Witnessed that with a mates glider at altitude years ago - the model was recovered complete from a park many miles away and luckily with no further consequences.

Thankfully, a rare occurrence but still a possibility, so its vital to make power supplies as bullet proof as possible, hence my recent worries and comments elswhere regarding cheap and nasty RX switches that seem to be available all over the place now.

[Charles Smitheman]

Back to the cut out:

I don't see mention of the o ring between the carb and the engine.  They also get hard.

 I make a point of pressing the carb firmly down while tightening the carb fixing screw to ensure an air tight seal.

And backplate seal was mentioned,  I have had this leak on an Irvine 20D

 

[Roger Dyke]

Charles: Thanks for your input.

The carb "O" ring is new as it came with the new carb. I also push down on the carb when tightening the pinch screw. There is no problem with leaks or adjustments on the carb whatsoever. I have now got one of the engines (46) in bits as I am replacing the bearings (precautionary). When removing the backplate, the backplate seal looked perfect. I will know more when I have finished re-assembling it and tested it in a bench stand.