rctom
Posts: 5191
Joined: 5/8/2002 From: Flower Mound (near Dallas),
TX, USA Status: offline
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People in this hobby (and I suppose in others as well) tend to jump on every bandwagon that passes by. Vendors send out a new wagon every few weeks to extract as much money from customers as possible. This of course is commerce, and I'm glad all this stuff is available. But just because something is new and better does not mean it fits every application. You do not need fast digital servos for every application. The 645 is a decent servo, but a little slow and non digital. Well, digital just makes a plane more sensitive, and fast servos extend that attribute. So if you have a plane that is naturally sensitive and quick to respond, what you don't need is to spend more money to make it more sensitive and faster. An Ultimate has an extremely fast roll rate, and is very sensitive around center. The last thing you need is faster digital servos, this would just mean you need to add a bunch of expo to slow it down. In this case the 645s work fine. I have been using 985s on my planes with multiple aileron servos. They are very accurate and fast, but non-digital. All my planes require some expo on aileron anyway, so I save about $100 per plane by using analog servos and I get the same performance. I like digitals for elevator and rudder, but they are often overkill on ailerons. Of course there are other reasons to buy digital servos, but on ailerons on many aerobatic planes they are not necessary. TF
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