RCU Forums - View Single Post - Hangar 9 P-51D Mustang 150 Review/Conversion
Old 02-17-2007, 05:03 PM
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Greg Covey
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Default RE: Hangar 9 P-51D Mustang 150 Review/Conversion

Ed,

I am not familiar enough with the Lithium Manganese batteries to answer your question. However, I can say that battery weight is less important on the bigger models than it is on the smaller models. With this in mind, you do not need to always use Lithium Polymer cells.

Al,

You missed a few things that should be considered. First, the extra voltage on a servo does not just increase speed but also increases torque. When using a standard size servo like the JR DS-821, it is important to get maximum torque on a giant-scale model like the P-51D which weighs 16lbs. In this manner, the control surface will more exactly follow the stick movement without added latency or blowback. Essentially, this provides better scale maneuvers.

DS-821 Specs:
Torque: 72 oz/in @ 4.8v, 88 oz/in @6v
Speed: .19 sec/60° @ 4.8v, .15 sec/60° @ 6v

Second, it is possible to have both 3D and scale flying skills.

The decision has been made (by popular feedback) to go with flaps and keep the bombs on the wing as in the stock Hangar 9 P-51D design. I will, however, be adding a Robart #121 retractable tailwheel controlled by an extra DS-821 servo.

Regards.