Rotax RPM and Flybox RPM difference.

by Przemysław Wiśniewski in General Tech Discussion 9 years ago

HI. I installed new flybox minieis but I'm connecter paraller rotax RPM gauge and EIS.
Now I have about 150-200rpm difference between both of them. Can I tune a little bit rotax gauge? I saw a regulator on back side of this instrument but I'm not sure if I can.

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Re: Rotax RPM and Flybox RPM difference.

by Roger Lee » 9 years ago

Roger Lee

126 5.13k 4.58k

Personally I would separate the rpm side. I don't think you need it.
I'm not a 100% sure you can run all three parallel.

Rob or Conrad,

Any thoughts on this parallel rpm setup?

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Rotax RPM and Flybox RPM difference.

by Przemysław Wiśniewski » 9 years ago

Przemysław Wiśniewski

65 247 3

Hi. Its very comfortable to have this analog one near speed indicator and to have digital eis for alerts and another data.
I found duri g test flight that on 2000rpm i have the same readings but on high (5000) i have about 250 rpm more on digital.

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Re: Rotax RPM and Flybox RPM difference.

by Przemysław Wiśniewski » 9 years ago

Przemysław Wiśniewski

65 247 3

I found this:
http://forums.bmaa.org/default.aspx?f=22&m=88652

"Then with the engine running check the accuracy by multiplying the frequency by 60 and comparing with the rev counter value. Note that the rev counter may not be completely linear. That is to say that it may read high at idle but low at higher RPM."

Anybody had experiences with this?

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Re: Rotax RPM and Flybox RPM difference.

by Przemysław Wiśniewski » 9 years ago

Przemysław Wiśniewski

65 247 3

And I found this one.

So I have to check it with frequency counter first.

SI_13_96.pdf (You do not have access to download this file.)

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Re: Rotax RPM and Flybox RPM difference.

by Przemysław Wiśniewski » 9 years ago

Przemysław Wiśniewski

65 247 3

Ok, It was rotax gauge problem. I tuned it by hidden regulator on 4000RPM and now it's ok (on high rpm).
Anyway it's not linear. On low I have about 100rpm to high but on 4-5k it's equal to digital one.
Digital one is more accurate..

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Rotax RPM and Flybox RPM difference.

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