I am in the process of putting together a 35% Yak with a DA 100 to be used primarily for 3D. Just curious if anyone has any opinions about what to use for the throttle. I was thinking about going with just an analog standard servo on the throttle and on the choke. Is the analog standard servo okay or would it be better to use a digital servo? Or, does it not really matter?
There are various opinions about whether or not to use a digital servo for throttle. At least as of a 2005 posting, Mike McConville believes it's best not to. "Many people do. Its not the best idea though. The power consumption is higher and there is no advantage to a digital on throttle." (
http://www.rcuniverse.com/forum/m_27...tm.htm#2729944).
Here's a quote, not from McConville, from a different thread - "Surprizingly, when building an 86" QQ Yak, Quique recommended using a coreless, non-digital servo with enough torque and speed. He says that is what he uses and that he has specific reasons NOT to use digital servo s on throttle." (
http://www.rcuniverse.com/forum/m_63...tm.htm#6372027)
On the other side of the discussion, I've heard very experienced pilots say that digital servos are required for throttle in order to maintain a accurate, low idle. You'll find several threads that talk about the topic by doing a search on "throttle servo" in the Giant Scale - Aerobatic forum.
Just be sure to keep it well back of the engine, 10" or more, and connected to the throttle arm with a non-metal linkage like a nylon Gold-n-Rod, especially with EI.
Not trying to pick a fight with you Charlie P. .... Whether or not non-metal linkage is required is a debatable topic. Quite a while ago, I asked Dick Hanson about using a metal pushrod or not and he said using a metal pushrod is fine as long as you isolate it by using plastic connectors on the ends. I use a metal pushrod with plastic ball links and do not have interference problems. I've seen several gassers with the exact same setup.
When looking for the McConville post cited above, I came across this from him - "Also be sure not to have any continuouse metal contact between the engne and linkage, i.e. use a plastic ball link to attach to the carb." (
http://www.rcuniverse.com/forum/m_21...tm.htm#2232016)
As with practically anything RC-related, Harleyflyer, there will be opposing viewpoints. Hope the info is helpful.
Dan