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Cox Engine of The Month
February-2024
1/2A Nut's

"RC Speed Boat Power Drive TD .020"

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surestart throttle ring Empty surestart throttle ring

Post  ChaseBanner Tue Oct 12, 2021 1:56 am

Just wondering if anyone has had any exp with this throttle barrel? Waiting on gasket ring kit from EX Engines to try it out and just wondering if I might be wasting my time? I have had many cox engines but never one with throttle control. Ive looked at all the cox throttle options but never seen this one This is a surestart cylinder turned down on a lathe like 1/2 a thou. If anything Id like to have the ability to stall the engine if needed, any input would be greatly appreciated!surestart throttle ring Pict0013
surestart throttle ring Pict0014
surestart throttle ring Pict0014Sorry for the blurry pics, Thanks all
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surestart throttle ring Empty Re: surestart throttle ring

Post  MauricioB Tue Oct 12, 2021 5:39 am

hello, the acceleration ring system, it is very effective, really effective.
I use commercial .049 rings and make my own rings for my engines as well.
You can use it safely, you will really like the result.
You can see some of my videos where I use regulation rings.







In flight:







and there is more.... Thumbs Up

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surestart throttle ring Empty Re: surestart throttle ring

Post  getback Tue Oct 12, 2021 6:48 am

Never ran a Cox throttle setup , but as you can see our friend Mauricio has and built most if not all his ! Thanks for more fling videos too . Very Happy This Site Rocks!
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surestart throttle ring Empty Re: surestart throttle ring

Post  ChaseBanner Tue Oct 12, 2021 7:17 am

MauricioB wrote:hello, the acceleration ring system, it is very effective, really effective.
I use commercial .049 rings and make my own rings for my engines as well.
You can use it safely, you will really like the result.
You can see some of my videos where I use regulation rings.




[youtube]Cpthanks, ive seen quite a few options, was just wondering if anyoneo23SQ78KU[/youtube]


In flight:



w



and there is more.... Thumbs Up

thanks was just wondering if anyone had any exp with this particular one
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surestart throttle ring Empty Re: surestart throttle ring

Post  ChaseBanner Tue Oct 12, 2021 9:35 am

MauricioB wrote:hello, the acceleration ring system, it is very effective, really effective.
I use commercial .049 rings and make my own rings for my engines as well.
You can use it safely, you will really like the result.
You can see some of my videos where I use regulation rings.







In flight:







and there is more.... Thumbs Up

getback says ur pretty much the man when it comes to throttling these little engines. Do they all work about the same or are some better than others providing ur engine is running like its suppose to? thanks MauricioB
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surestart throttle ring Empty Re: surestart throttle ring

Post  MauricioB Tue Oct 12, 2021 12:30 pm

The acceleration ring in aluminum alloy depends directly on the type of alloy and the thickness of the ring wall.
The effectiveness of the aluminum alloy ring can be affected because the expansion of the metals is different (between the iron cylinder and the aluminum alloy ring), when this expansion is different as the engine takes temperature, the effectiveness is affected as the stretch fit ratio changes. So, your aluminum alloy ring will be effective if and only if, the expansion ratio between cylinder and ring is maintained, that will depend as I said before, on the type of alloy of your ring and the thickness of the wall of the ring itself.
This is a Cox Tee Dee .09 r / c engine. The throttle ring is self-made in aluminum alloy, as you can see there is a reduction in thickness that I made to achieve the best engine performance in all speed ranges.
(surely if you buy a throttle ring from a genuine Cox engines representative, this will already be calculated)
Hope you can understand me.
surestart throttle ring 20181214

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surestart throttle ring Empty Re: surestart throttle ring

Post  ChaseBanner Thu Oct 14, 2021 2:44 pm

MauricioB wrote:The acceleration ring in aluminum alloy depends directly on the type of alloy and the thickness of the ring wall.
The effectiveness of the aluminum alloy ring can be affected because the expansion of the metals is different (between the iron cylinder and the aluminum alloy ring), when this expansion is different as the engine takes temperature, the effectiveness is affected as the stretch fit ratio changes. So, your aluminum alloy ring will bjhe effective if and only if, the expansion ratio between cylinder and ring is maintained, that will depend as I said before, on the type of alloy of your ring and the thickness of the wall of the ring itself.
This is a Cox Tee Dee .09 r / c engine. The throttle ring is self-made in aluminum alloy, as you can see there is a reduction in thickness that I made to achieve the best engine performance in all speed ranges.
(surely if you buy a throttle ring from a genuine Cox engines representative, this will already be calculated)
Hope you can understand me.
surestart throttle ring 20181214

Thank you MauricioB. makes perfect sense. Now I wish it was metal but anyway I gor my gasket kit today so ill put her together and give her a shot. Ill post my experience with this throttle sleve. Thanks again MB
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