Possible Problem with SectionF8 Sabre

L

Lightning

Charter Member
I noticed while doing some flying with Jan's fabulous F-86 that it would pull ever so slightly to the left on take-off roll down the runway.
Was playing with creating an AI version for myself when I noticed what seems to cause it.

[contact_points]
point.1 = 1, -6.9, -4.8, -6.21, 4000, 1, 1, 0, 0.32, 2.40, 0.7, 8, 7, 2, 0, 0
point.2 = 1, -6.9, 4.8, -6.24, 4000, 2, 1, 0, 0.32, 2.40, 0.7, 8, 8, 3, 0, 0

These are the up/down contact points of the main landing gear.
Pretty sure this is not right.
Both should be the same?
Variation is so slight that you could change either to match and it would be fine.
If there is a reason for this being the way it is, maybe Jan will pipe in and let us know, but in the meantime changing both to -6.24 seems to have fixed my problem just fine.
Again to all the SectionF8 Sabre team, thanks so much for this fantastic aircraft :medals::medals:
 
Perhaps you had a leaking oleo seal, did you check it properly on the walk around?????? As real as it gets:costumes::costumes::costumes::costumes:
 
Lightning said:
I noticed while doing some flying with Jan's fabulous F-86 that it would pull ever so slightly to the left on take-off roll down the runway.
Was playing with creating an AI version for myself when I noticed what seems to cause it.

[contact_points]
point.1 = 1, -6.9, -4.8, -6.21, 4000, 1, 1, 0, 0.32, 2.40, 0.7, 8, 7, 2, 0, 0
point.2 = 1, -6.9, 4.8, -6.24, 4000, 2, 1, 0, 0.32, 2.40, 0.7, 8, 8, 3, 0, 0

These are the up/down contact points of the main landing gear.
Pretty sure this is not right.
Both should be the same?
Variation is so slight that you could change either to match and it would be fine.
If there is a reason for this being the way it is, maybe Jan will pipe in and let us know, but in the meantime changing both to -6.24 seems to have fixed my problem just fine.
Again to all the SectionF8 Sabre team, thanks so much for this fantastic aircraft :medals::medals:
Click to expand...

Seems I'm having a similar problem as lightning, except mine is much more exagerated to the right.. It's like a Jug with paddle blade prop, it wants to make a hard right turn when take off power is applied. I tried the adjustment Lightning mentioned but no help, it still "torques" right! Any ideas? Do I need to reinstall?

Man this baby is gorgeous!

LDF:d
 
Bear in mind that a lot of the old single engine jets such as the Sabre with axial flow turbojet engines did have a significant degree of gyroscopic procession from the high center spool rotation speed. This normally dissipated as airspeed built up. I had no trouble keeping the Sabre straight on the runway during takeoff or landing.
 
deathfromafar said:
Bear in mind that a lot of the old single engine jets such as the Sabre with axial flow turbojet engines did have a significant degree of gyroscopic procession from the high center spool rotation speed. This normally dissipated as airspeed built up. I had no trouble keeping the Sabre straight on the runway during takeoff or landing.
Click to expand...

Thanks DFA. Handy bit of info, specially since I've never flown one! :costumes:

I can keep her on the runway but it takes a good bit of left rudder. Once she's up over 300kts she's flies like a dream. However, until that speed is reached, she want's to roll right. I've reset trim to neutral on all 3 axis and crank in nose up take off trim per the manual. Landing is no problem.

Does that sound normal?

LDF :d
 
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