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Old 06-21-2019, 05:08 PM   #1
hk4fvj
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Best Glow Plug OS AX 75: 7, 8, 10?


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Hi Guys
According to myy OS AX 75 engine's manual, it is possible to use either #7, #8 or #10 (a5) glow plugs.
I was using plug #7 but sounded like it was going to shatter apart into 1000 pieces. I replaced it with a plug #8 and the sound is smoother. I tried later #10 (A5) then the engine tends to die about half throttle.
I heard that #7 os hot, 8 is standard and 10 is cold but still dont know when to use one or the other.

Please let me know why my engine die with plug #10, why those differences, why is one better than other and when to use each.
Thanks!.
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Old 06-21-2019, 05:20 PM   #2
jsparky
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

Quote:
Originally Posted by hk4fvj View Post
Hi Guys
According to myy OS AX 75 engine's manual, it is possible to use either #7, #8 or #10 (a5) glow plugs.
I was using plug #7 but sounded like it was going to shatter apart into 1000 pieces. I replaced it with a plug #8 and the sound is smoother. I tried later #10 (A5) then the engine tends to die about half throttle.
I heard that #7 os hot, 8 is standard and 10 is cold but still dont know when to use one or the other.

Please let me know why my engine die with plug #10, why those differences, why is one better than other and when to use each.
Thanks!.
First off ,, there is no #7 .. second it depends alot on the fuel your running and the temperature outside.. cold winter flying or hot summer..

Take a good read of this link.. it will explain everything you will need to know about glow plugs.

https://www.hooked-on-rc-airplanes.c...low-plugs.html
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Old 06-21-2019, 05:25 PM   #3
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

No #7???

https://www.towerhobbies.com/cgi-bin/wti0001p?&I=LXWZB5
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Old 06-21-2019, 05:35 PM   #4
hk4fvj
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

Quote:
Originally Posted by jsparky View Post
First off ,, there is no #7 .. second it depends alot on the fuel your running and the temperature outside.. cold winter flying or hot summer..

Take a good read of this link.. it will explain everything you will need to know about glow plugs.

https://www.hooked-on-rc-airplanes.c...low-plugs.html
Thank you the link Jsparky. As I said, I started using #7. And to confirm it, I have attached a picture showing the three brand new different type of plugs. Just to correct, the #8 is called Medium, while #7 is Medium Hot.

I am using either 10 or 15% fuel
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Old 06-21-2019, 05:39 PM   #5
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

Quote:
Originally Posted by hk4fvj View Post
Thank you the link Jsparky. As I said, I started using #7. And to confirm it, I have attached a picture showing the three brand new different type of plugs. Just to correct, the #8 is called Medium, while #7 is Medium Hot.

I am using either 10 or 15% fuel
.
Attachment 1634809
Then a #8 should be just fine..

wow.. learned something.. must be the A3 with the name #7... go figure.. anyway if you want to understand how the platinum in the plug works.. check this video..

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Old 06-21-2019, 05:50 PM   #6
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

I’ve been running an OS#6 (old A3) in my 75AX running on Cool Power 15%. I use the same in my 95AX as well. I was running a #8, but it just wouldn’t run right. Keep in mind, we have a field elevation of around 3300’ which likely factors in. I have about 150 flights on the 95AX and 25-30 on the 75AX. Both engines are rock solid...

By the way, what happened to the OS Engines site? It now goes to Horizon Hobbies. All the good info is gon including the troubleshooting guide and FAQ ��
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Old 06-21-2019, 05:57 PM   #7
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

What size of prop on the 75
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Old 06-21-2019, 05:58 PM   #8
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

Quote:
Originally Posted by Christavia View Post
By the way, what happened to the OS Engines site? It now goes to Horizon Hobbies. All the good info is gon including the troubleshooting guide and FAQ ��
You answered your own question..

Horizon Hobbies..

that's what happened
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Old 06-21-2019, 06:31 PM   #9
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

APC 14x6 on a GP Super Skybolt. I recently tried a Master Airscrew 13x6 3-Bladed (I broke my usual prop and that was all I had with me) and although it turned a bit slower, it performed the same in flight. BTW, Iím also using a Bison Pitts muffler
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Old 06-22-2019, 07:35 AM   #10
hk4fvj
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Re: Best Glow Plug OS AX 75: 7, 8, 10?

Quote:
Originally Posted by jsparky View Post
What size of prop on the 75
Prop size is 14X7. I am in SW Ontario which is about 200 m (600') ASL.
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