Rather than move the throttle servo forward of firewall to obtain the correct balance point, move heavier battery pack forward or use a Harry Higley & Sons Heavy Hub.
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Rather than move the throttle servo forward of firewall to obtain the correct balance point, move heavier battery pack forward or use a Harry Higley & Sons Heavy Hub. |
Q-19: I need extra nose weight to balance my Scale model and was wondering if might move my throttle servo up front, forward of the firewall? What do you think of the idea?
A-19: I'm not in favor of that idea at all. The throttle servo would be extremely close to the engine, where it would be subject to fuel residue and mechanical vibration; neither would provide a long-lasting servo. Also, the average standard-size servo weighs approximately 1.5 ounces, so you aren’t gaining that much weight forward for all of your trouble.
I suggest that you move the receiver battery pack forward, to a point just under the engine. Wrap the pack in padding and a plastic bag. You can access the battery for charging purposes by using the charging jack located on the switch harness; presumably that will be back in the RC compartment. By using the battery you should be able to gain 3-4 ounces of weight farther forward to balance your airplane.
A final suggestion is the use of a Harry Higley & Sons Heavy Hub which is a 2-ounce propeller spinner. Since it mounts on the end of the engine's crankshaft, the weight is almost as far forward as you are going to get it. It’s an easy solution to a tail-heavy model.
The only problem is that the hub isn’t available in many propeller shaft sizes. Check http://members.aol.com/harryhig/EngineAccessories1.htm to see what is available.