• This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn more.

Servo Suggestions For SPAD Stick

jsut210

Expert Crash-Lander
#1
Hello, I am just not starting to get the parts in order for my next build. I'm planning to use a Ryobi 31cc engine that I've converted and throw it on this: http://www.spadtothebone.org/PDF/Ultra Spad Stick.pdf .

My question is about the servos that I should use. At first I was looking at these: https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idproduct=22528
They are so cheap and seem to have decent reviews. But, lately I've been reading that you should never cheap out on servos. So, I found these metal gear servos: https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idproduct=42431
They are about double the price of the plastic ones but they also have about double the torque. Do I need to spend more money and get the metal gear servos, or should I just stick with cheap, replaceable ones? 8 servos at $6 is a lot for me to spend right now.

P.S. I forgot to mention, if you haven't read the build guide for the plane, you should know that there are 2 servos on the elevator surface. Not sure how much that matters.
 

xuzme720

Dedicated foam bender
Mentor
#2
You are using an IC engine. Vibration on the airframe is going to be much higher than electric. For just that reason, it would be best to go with the metal gear servos. Plus you are dealing with more weight than your average foamy and damage to surrounding structures/vehicles/people could be much worse if you lose a servo. I would say splurge for the good stuff on this one.
 
#3
Be careful if you build a USS per plans. They are a bit overbuilt and fairly heavy. That 31cc Ryobi will fly it fine (you are swapping out the carb right?) but the up-lines will be a little weak. It will hammerhead OK but there's not much vertical there, especially for a new builder. Noob's always build heavy. it's something we all learn our way out of doing. :)

That being said, the coro deadens vibrations very well so Nylon gear servo's will be fine. As a bonus, the control surfaces on a USS are broken up so you could use standard 43g servos. All that being said, we've had very good luck with the 5010 servos from HK and Ebay. I've used them on gassers, even set up in flaperon configuration on a 72" wing.

In fact, I'm near finishing my 1/5 scale, 82" span FW-190, powered by a 33cc homelite saw conversion and it will use the 5010 servos.

Good Luck!
 
Last edited: