Telemetry Radio
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Old May 16, 2008, 01:31 PM
More Motors, More Fun... :-)
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Phoenix, AZ
Joined Jan 2008
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Handy Reference Information

How to set up a basic "throttle kill" switch mix for the Futaba T7C (7C) Radio

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Description: The Futaba T7C (7C) Radio.

Application: this mix is for Electric Aircraft use.

PRINT: See the PDF file available below in the "Files" section for download.

Please - always do programming and testing without a prop mounted to the motor!

On the 7C, the throttle channel is assigned to channel 3. For this example, the throttle kill switch will be set on switch "A". Switch "A" will act upon the throttle stick. Switch "A" in the "down" position is throttle stick "kill". Switch "A" in the "up" position is throttle stick active.

Ready the radio: Move switch "A" to the "down" position. Set your throttle trim to zero.

Program the radio: Go to "P-MIX3" on the advanced menu. Press the dial, you will see the first P-MIX3 screen. Press the down arrow key until you see the second screen (yes, you start programming with the second screen instead of the first).

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Description: Futaba 7C Radio - Screen two

Scroll down to return to the first screen. Put throttle stick in the fully off position.

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Description: Futaba 7C Radio - Screen one

Select OFS > SET, then press and HOLD the dial until the radio makes a confirmation beep.

Then set, RT > to -100% (minus 100 percent).

Press the "END" button to return to the main screen and thoroughly test throttle channel functions. The throttle channel should not respond when switch "A" is in the down position. You should have full throttle control when switch "A" is in the up position. You can of course, assign any available switch to the throttle cut mix.

Note: Do not use trim settings on the throttle channel. This basic mix cannot disable trim.


This section contains information that is handy for building. Nice for posting on your toolbox or workbench.

Drill Chart

showing metric, numerical, alpha (letter), and SAE sizes with decimal equivalents from Drill size 80 to 1 inch. This is better than the usual "listing" you find on the internet as it is condensed onto one letter-size page. VERY handy for finding out the drill bit needed when you know the decimal measurement.

See below for the download.

Millimeters Inches Designation
.3429mm .0135"
.3683mm .0145"
.3969mm .015625" 1/64"


Assan Adjustable Retract Gear and Door sequencer w/Display Manual

In actual understandable English! This is my version of the manual for the sequencer. The Assan Adjustable Retract Gear & Door sequencer w/Display is available at HobbyKing, and it is item number 11258, PRODUCT ID: HGDS-1. It is a simple sequencer, but it does the job. Would be nice to have a servo slo-down for the doors, but at this price...

See below for the download

Futaba - HiTec Servo Rotation Notes.

With a Futaba 7C Radio Transmitter and Futaba R617FS Receiver connected to a HiTec HS-5645MG Programmable Digital Servo (default programming), maximum rotation possible is 80.

so, for the given 7C settings:

D/R = 100%, Endpoint = 100%: rotation = 80
D/R = 140%, Endpoint = 100%: rotation = 113
D/R = 140%, Endpoint = 140%: rotation = 117.5

D/R is "Dual-Rate" which commonly, but incorrectly refers to "travel".

It is possible to program HiTec servo's for up to 180 rotation. Radio settings are scaled up or down accordingly. If the SERVO is programmed for 180 rotation, radio maximum settings (140%, 140%) will allow 180 rotation. If the SERVO is programmed for 60 rotation, radio maximum settings (140%, 140%) will allow 60 rotation.

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Last edited by nioa; Nov 18, 2013 at 11:51 AM. Reason: Update
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