The Wolfhound's thrust is slightly off-center
I've been using this engine a lot for circularizing to LKO and noticed an odd yawing when immediately going full-throttle. Looked into it further and KER reports some torque would be generated even with just a fuel tank and a wolfhound attached to the bottom node; to relate to the positioning tool's axes, it seems to be off-center mostly in the direction of red and slightly in the direction of blue.
#1 Updated by rudi1291 about 3 years ago
- File screenshot13.png screenshot13.png added
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- Status changed from New to Confirmed
- % Done changed from 0 to 10
- Platform Windows added
This becomes quite obvious without SAS. Attached a screenshot of a very simple test where this is visible.
The Wolfhound is also not the only one, which has a noticable offset, the Cheetah also has an offset (although thats much less).
#5 Updated by rudi1291 about 3 years ago
- File screenshot29.png screenshot29.png added
- Status changed from Ready to Test to Not Fixed
- % Done changed from 80 to 50
The Wolfhound´s offset is unfortunatly still present, altough much less severe now (and almost unnoticable with a fueltank attached). The Cheetah´s offset hasn´t changed at all.
#7 Updated by Anth12 about 3 years ago
You just need to put the engine on the end of a part and turn on the center of thrust indicator and spin the engine around to see its moving.
The Cheeta's center of thrust is wrong as well.
Note this isnt about seeing a visual difference as it spins around.
The Mainsail moves around when it is spinned visually but its center of thrust does not so noone has had a problem with it
#8 Updated by jclovis3 about 3 years ago
Currently in version 1.4.2:
On the ground, the engine is so weak, it's hard to tell if it might just be gravity or aero forces affecting it. I brought one up into space attached to an OKTO probe with no torque and locked the gimbal on the engine, then noticed a slight pull to one side. I activated the gimbal to steer towards prograde, then turned SAS off and locked the gimbal to observe that with a mild thrust, the direction started reversing back away from prograde.
In my ship, I start with the 90 degree marker to my right and all parts are aligned. A solid fuel rocket gets me up to about 15 km where I then switch to the Wolfhound and take it up beyond 70 km. No matter what direction I am drifting with SAS off, thrust turns that towards the 90 degree marker.