TEXAS 3F TIMER -THREE FUNCTIONS
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A new timer to meet the needs of fliers who are using auto surface control requiring three functions. Several years were spent gathering inputs and making what seemed like a hundred prototypes. We were just not satisfied with any of them, until now. Finally, this is a timer that can proudly carry the Texas Timers name. It uses construction methods to make it a very strong timer. One that is made to take the beating from today's hot and high revving engines. For example, the faceplate is constructed using much thicker metal than our other timers, the rear posts on the clock are soldered in place-no screws to come loose, a special steel screw has been made to hold the scroll and disk assembly to the main shaft. This provides added strength as well as offers a wider slot for our new winding and setting tool, which greatly adds to the ease in winding the clock as well as setting precise times for the Function 2 delay and scroll DT time.
Perfect for the F1P event.
We have learned that many of our customers are actually using the second function as a quick DT. Had not expected that, but it is a good way to use this timer.
If you intend to use this timer with big engines having a lot of vibration, we do suggest use of the model timer built for this. See Design Changes (below). See our Vibration topic in Helpful Hints.
Faceplate size 2.2 x 1.06 inches
Weight is 23.4 grams.
A remote device to shut off the full upon release of the timer post is required, such as our Remote Pinch Off (RPO).
The standard Texas Timer Stop Lock manual start stop switch is included but one can use one of the available "start on release" switches now on the market. We have our own in development now.
The lower engine run time disk is fairly large to aid in accurate time settings. This disk is keyed to the main shaft, so it will not slip when adjusting the second function or DT. The disk can be set to different keyed positions in 90 degree increments.
The release point for the engine shut off is at the bottom of the timer, thus putting the arm to the Remote Pinch Off (RPO) more in line with the engine, thus making for a cleaner setup.
The second function disk is free to rotate for any setting needed.
The function wires are very stiff, and you can expect extremely accurate and repeatable time settings and delays.
A very special feature is the auto repel on the second function wire. It absolutely can not fall down or bounce back into the disk, or cause a malfunction.
The winding ears used on our other timers have been eliminated based on many requests. We offer an optional winding tool that is convenient to use and aids in setting the delay times on the second function and DT. This winding and adjustment tool is shown in the photos with the timers.
The timer can be used with our new Start on Launch Switch.
A special all steel screw is used to hold the scroll and disks. This screw has a wide slot to accept the optional winding tool.
The timer is designed to use our Split Rings on the function posts, or something similar of your choice.
The faceplate is made with substantially thicker metal to "beef it up". This was requested by many customers now using Seelig timers
The rear clock assembly posts are all soldered in place.
Loctite 242© is used on all front assembly posts.
Two versions of the timer are offered. The 3F III, for Cat II and III flying, has a first 360 degree turn of about 21 seconds, and a DT time of over 3 minutes. The 3F I for Cat I has a first turn of about 30 seconds and a DT time of over 5 minutes. We do this to keep the rotational speed as high as possible to achieve optimum accuracy for tight engine run time settings.
An Installation Kit is available, and we strongly encourage its use to greatly simplify reliable installation in your fuselage. The kit includes a vacuum formed dust cover to aid in making a reliable installation.
Is it expensive? It may be, if you are looking for an "el cheapo" timer. I do not make timers like that. Is it really expensive?.
We have changed all of our timers to use a new type of scroll that has significantly deeper grooves to retain the DT wire in the presence of strong vibration, and to use a DT wire that has a 20% increase in diameter, which makes it TWICE as stiff. These are very noticeable enhancements to the timer.
See our Vibration topic in Helpful Hints.
|SPECIFICATIONS (Typical)||3F I||3F III|
|First 360 ° Rotation time (seconds)||30||21|
|Maximum DT time (minutes)||5+||3+|
|Faceplate size (inches)||1.06 X 2.2||1.06 X 2.2|