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Magnus Build thread - TJIRC

Wayne said:
We have been getting reports of possible new splines on the KST servos. We just added some new metal arms to our site from TLS, and they list the X06 as the same as the X08, but the A08 has a different spline. Here is the servo arm, if it does not fit your servo, we will send you a return label and get you a full refund.
alofthobbies.com

TLS Servo Horn for KST X06, X08 & CHA 06 Servos

High performance servo horns produced by Tomas Liu Studios. KST X06, X08 (Does not fit HS08 or A08.) CHA06 Features: Servo horn with holes at 4, 6 & 8mm from center m2 screw *1
alofthobbies.com alofthobbies.com
or with the fancy clevis:
alofthobbies.com

TLS Servo Horn & Clevis for KST X06 X08 & CHA 06 Servos

High performance servo horns produced by Tomas Liu Studios. Servo horn (.2g) fits the following KST X06, X08 (does not work with A08 or HS08) CHA06 Features: Aluminum 7075 anodized 4mm spline pin 1.3 x4.2mm aluminum m2.5*0.45p thread (adapter for 2mm rod) m2 screw *1
alofthobbies.com alofthobbies.com

I am starting to think that KST has changed splines once again.. Also, we had a customer that bought some KST from another supplier and they appear to be VERY old units. That's fun.
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I just ordered these in for $10 a pop straight from Taiwan... I noticed these cheap clevis's do not work on them. Tomas Liu horns work fine on my x08 pluses I will check the A08s straight from KST Servo China to see what the problem is
 
Tahoed said:
I just received an order for 08 frames and arms. The frames are for the 08's, but the servo arms fit the 06 but not the 08a's. This is not good.:oops: .Hi Wayne😅

Update: Just checked TLS site. It indicates the the current horns won't fit the 08a's, but will fit the X series. Aloft indicates the X series. I should pay more attention, but I'm laying the blame on KST for changing the outputs in the same series of servos.🤬
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Its hard to understand why they should do that in the first place, knowing it will cause a heck of a lot of trouble.

Is there really so much difference in a slghtly higher or lower spline count?

Doc
 
Doc J said:
Its hard to understand why they should do that in the first place, knowing it will cause a heck of a lot of trouble.

Is there really so much difference in a slghtly higher or lower spline count?

Doc
Click to expand...
As you can tell they didn't do anything. Wayne and I ordered the same parts at the same time from the same company. You tell me what's going on? Wayne has had nothing nice to say about kst. Knowing the China man, they take that to heart. They don't like a bad reputation.
 
Meanwhile, at J-Ron Aerowerks...
IMG_8781.jpg


It's an old Aveox F27 F5B motor and planetary. Gonna run it on 6s with this 15x13 prop everyone used to run back in the day. Should make the donuts, so to speak.
 
That is about a 50% differential setting. This counteracts the adverse yaw that ailerons often induce onto an airframe, and our long winged gliders make this uneven force even worse.

If you ever fly a glider with little barn door ailerons out towards the tips, you will get a very fast lesson on how bad adverse yaw can be.

1727735497254.jpeg

"Adverse yaw is the tendency of an airplane to yaw in the opposite direction of the turn. For example, as you roll to the right, your airplane may initially yaw to the left. When you roll your airplane to the right, your right aileron goes up, and your left aileron goes down. The aileron in the upward position (the right aileron in this example) creates less lift and less drag than the aileron that is lowered. The aileron angled downward (the left aileron in this example) produces more drag and more lift, initially yawing the airplane in the opposite direction of your roll."

In full scale aviation, they usually leave it up to the pilot to correct this with rudder input. In RC we like to correct this by throwing the ailerons differently. More up than down to add more drag to the wing with the aileron going up and reduces pilot workload and makes your rolls more axial also.

No idea why they do not use differential on more full scale aircraft. (I have seen a few that do have differential.) I have also seen some other interesting methods they try to fight adverse yaw on full scales.

Differential is pretty easy to add to a model. Prior to computer radios we used our linkage geometry to achieve the correct throws. But these days we can adjust it in the radios as long as we have dual aileron servos installed.

Each plane will need a different level of correction. Some planes have so much adverse yaw that are hardly flyable without a HEAVY correction. That is pretty rare these days.

Hope this helps.
 
Justin, what you’re referring to is called aileron differential. The more ‘lifty’ the wing aerofoil is, it’s normal to use much less down throw than the amount of up on the opposite wing. The reason is because on a ‘lifting’ wing section as used by most gliders, in a banked angle turn (if both ailerons have equal throws up and down) the down going aileron will produce much more drag on that side of the plane, slowing that wing down. That results in a yawing motion, which can be seen as the tail dropping and the higher wing (on the outside of the banked turn with the aileron down) being behind the lower wing on the inside of the turn.
To get the plane to do a nice banked turn with the wings in line and the fuselage horizontal, aileron differential (less down than up) is therefore used.
This is a very basic explanation of what differential is and does. Some planes will use literally half or less down throw compared to the up throw, it‘s usually dependent on the aerofoil section.

Hope this helps, just follow the set up from Jonathan and you’ll be good to go!

Cheers
 
Thanks all! I've been going through all the build posts I can find, learning a ton.

Question about using the LDS: this video shows the aileron servo arm being offset at the neutral point:
1727737994138.png


Is that to compensate giving the aileron more up than down?
 
It sounds really nice at the field! Jarron is very happy with his new toy. Airframe doesn't seem to mind at all.
 
Hello, I just ordered a carbon magnus to go with my knife. Anyone using a 1,500 watt or more setup in the magnus? What kind of speeds is the electric version seeing?
 
Rcdan12 said:
Hello, I just ordered a carbon magnus to go with my knife. Anyone using a 1,500 watt or more setup in the magnus? What kind of speeds is the electric version seeing?
Click to expand...
I believe my setup is in that power range. Haven't clocked it for speed yet though. Have a look at my video in this thread.
 

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