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TBM Throw Meter
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TBM Throw Meter

In Stock
 
$19.95
 
Item# (TBMTHROWMETER)

 

  • Overview

Use this meter to measure the deflection of control surfaces. It is ideal to have identical deflections from one aileron to the other and one elevator to the other. In practice, if there are slight differences few pilots will notice.

The throw meter is most useful when setting up multiple servos on one control surface. If you have 3 servos on one aileron for instance, use the throw meter to set up the throws for each servo, one at a time. Connect one servo. First set the neutral point, then adjust the deflection to some amount, for instance up 12 degrees and down 12 degrees. Do this with the other 2 servo’s linkages disconnected so there is no binding. Then disconnect the linkage to the first servo, and connect the linkage to the second servo. Set the neutral point first and then the throws to up and down 12 degrees. Then do the same for the third servo. Adjustments can be made mechanically and electronically. Adjustments should be done mechanically primarily, and electronically for fine tuning. Using a power expander or computer radio are examples of electronically tuning. Once all servos move the aileron up and down 12 degrees, then connect all three servos. At neutral the servos should not be fighting one another, if they are, make adjustments electronically. Then at the maximum deflection, in this case 12 degrees, make sure there is no binding, if so, make adjustments electronically.

With multiple servos on one control surface, again, slight variations are not a problem. When the surface is deflected there is a large load on the servos which is far greater than the load from a slight mismatch.

I find it most useful during set up to power the Rx with just one battery pack. Between the battery pack and the Rx I install an amp meter which shows the load on the battery. It is easy to see any mismatch as an increase in amp draw. Adjusting the servo the correct direction will lower the amp draw. At some point you will see the lowest amp draw (never 0 but just a few tenths of an amp).


 

 






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WARNING - Gasoline and Turbine powered R/C model aircraft are not manufactured to withstand unlimited G's. Any R/C model aircraft can fail, be it a wing folding up or a fuselage breaking in half under too high of a load. Just as any full size aircraft, model R/C aircraft have a maximum G rating. Because you are not in the plane flying it and experiencing the G's and reading the G-meter, it is more difficult to judge the G's on the aircraft, and it is very easy to exceed the limits of the aircraft. Understand that if you perform a snap roll, parachute, wall, blender, knife edge loop, or pull hard on the elevator at almost any speed, you can be putting in excess of 15 G's, even in excess of 30 G's, and most aircraft can only designed to take 10-12 G's. If you perform any violent maneuver, you can break your plane. When I perform hard maneuvers, especially for the first time on an airframe, I am prepared for a failure and am prepared for it as best I can be. This mainly includes performing the maneuver far enough away from spectators that in event of a failure that I am not endangering others. In addition, be prepared for the manufacturer to not pay for a new airframe which is broken during flight. It is common practice for any manufacturer to not replace an airframe which breaks in the air or upon landing. I have only seen manufacturers replace airframes when they have received many of the same failures and the manufacturer determines that there was a design or manufacturing error. If you break an airframe, and you are the only one to do so, then it is probably not the fault of the manufacturer. Please fly safely, and avoid full throttle operation other than at low airspeeds.

R/C model jets, warbirds, aerobatic planes and UAV Unmanned Aerial Vehicles to name a few are not a toy! If misused, it can cause serious bodily harm and property damage. Fly only in open areas, and AMA (Academy of Model Aeronautics) approved flying sites. Follow all manufacturer instructions included with your plane, radio, servo's, batteries and engine. Aircraft manufacturers guarantees each kit to be free from defects in both material and workmanship at the date of purchase. This warranty does not cover any component assembled by the customer. All parts of high stress must be inspected and reinforced if necessary by a competent builder. Some parts should be glued again. High stress areas such as firewalls, motor boxes, wing mounts, landing gear mounts, etc., are areas of high concern. Seek help if necessary. In not case shall TBM be liable for the cost of any product it offers which is not manufactured by TBM. The liability to the manufacturer cannot exceed the original cost of the purchased item. Further, TBM reserves the right to change or modify this warranty without notice. In that TBM has no control over the final assembly or materials used for final assembly, no liability shall be assumed nor accepted for any damage resulting from the use by the user of the final user-assembled product. By the act of using the user assembled product, the user accepts all resulting liability. The kit manufacturers have provided you with a top quality, thoroughly tested kit and instructions, but ultimately the quality and fly ability of your finished model depends on how you build it; therefore, we cannot in any way guarantee the performance of your completed model, and no representations are expressed or implied as to the performance or safety of your completed model. It is the user's responsibility to inspect each component for worthiness.