Trim for takeoff

[Eagle7907]

I know I saw it somewhere in here talking about takeoff trim and cat shots, but was also mentioned there was a problem for us to determine the MAC for a given configuration. Is there any resource or progress on solving this issue? I’ve noticed the heavier the loads the more the jet struggles after leaving the bow with the standard 2 degrees.

 

Has anyone done testing to help us determine what setting should be used?

 

Also, the jet cold starts with trim at up 2 degrees, but I read zero is used for runway takeoffs. Is that still the case or is this something being worked on, eg FM updates?

 

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Edited September 11, 2019 by Eagle7907

[Eagle7907]

Hey IronMike, can you provide any news on this?

 

 

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[IronMike]

no FM changes on that. trim at zero for landbased is fine, MF only. For carrier based take offs, I found the numbers in the natops too steep. I use 0 clean (you have full flaps), 2 for normal/light, 3 to 4 for usual air to air, maybe 5 to 6 if I carry havy bomb loads. While not sure how realistic, I found these numbers to work well for me.

 

Don't hold the stick back, only losely, catch it ones it starts moving forward after the cat shot, gears up immediately, flaps at 225, trim for level at 500 feet for 7nm. That is my procedure

[Eagle7907]

Trim for takeoff

 

no FM changes on that. trim at zero for landbased is fine, MF only. For carrier based take offs, I found the numbers in the natops too steep. I use 0 clean (you have full flaps), 2 for normal/light, 3 to 4 for usual air to air, maybe 5 to 6 if I carry havy bomb loads. While not sure how realistic, I found these numbers to work well for me.

 

Don't hold the stick back, only losely, catch it ones it starts moving forward after the cat shot, gears up immediately, flaps at 225, trim for level at 500 feet for 7nm. That is my procedure

 

 

 

Ah okay. So there have been testing for the NATOPS values in DCS. That sounds reasonable with what you came up with regards to cat shots. I did a shot with lots of Mk 82s with 2 degrees trim. I almost got wet. However I’m not really sure it was a trim issue or weight, because I forgot to check.

 

However the increase in weight for loadouts would correlate with the aft CG. Most of the stores are on the back half of the jet. Question is by how much?

 

Thank you for your input.

 

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[Danny_P]

@Eagle do you have the afterburner detent enabled on your warthog? If so I found I needed to tweak my throttle curves slightly so that I was actually on mill power at the physical gate. Whilst it only gives you a little extra power it does help. Also in the event of a bolter it actually disengages your speed brake as it should.

 

On axis tune I set it to be a slider and had a +10 on x curve.

[Eagle7907]

@Eagle do you have the afterburner detent enabled on your warthog? If so I found I needed to tweak my throttle curves slightly so that I was actually on mill power at the physical gate. Whilst it only gives you a little extra power it does help. Also in the event of a bolter it actually disengages your speed brake as it should.

 

On axis tune I set it to be a slider and had a +10 on x curve.

 

 

 

No I don’t use the AB detent. I have it the other way for fuel control. I just watch the fuel flow,nozzle position, and the throttle position for military power.

 

 

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