Blackbird Sims / Milviz Forum Archive

Not sure if this is a problem on my end or if anyone else is having this issue after the latest update. After takeoff with the J/S model I get an un-commanded pitch up once the gear and flaps are raised. At first I thought it might be an issue with my axis assignments on my joystick but I use the same template for the E model and don't get the pitch up while flying that model. It's not a big deal and is easily corrected by slight forward pressure on the stick and disappears as the aircraft accelerates.

Have you, uh, perhaps, by chance, read the manual? About taking off?

Uh, I have. I understand the aft CG, stores, etc. But I didn't have such a pronounced pitch up until recently. I trim the nose half-way down prior to takeoff, half stick back on takeoff roll, etc. But again, I don't get the same effect in the E.

You don't have the E ADV correct? I think there is insufficient nose down trim. The ADV is way more sensitive to things like this....Speed changes will change your trim setting.

Firecapt32 wrote: ↑

Thu Jul 19, 2018 8:27 pm

Uh, I have. I understand the aft CG, stores, etc. But I didn't have such a pronounced pitch up until recently. I trim the nose half-way down prior to takeoff, half stick back on takeoff roll, etc. But again, I don't get the same effect in the E.

Odd, no changes made in the pitch axis in the last update...is it happening in the S, J or both?

Also, the pitch up tendecy is slightly higher in the J/S than in the E due to a significative more aft CG in the naval versions resulting in different takeoff techniques.

JonathanBleeker wrote: ↑

Thu Jul 19, 2018 9:06 pm

You don't have the E ADV correct? I think there is insufficient nose down trim. The ADV is way more sensitive to things like this....Speed changes will change your trim setting.

I have the Advanced version of both models. I will put in a little more nose down trim for takeoffs in the J/S to see what happens.

Alvaro wrote: ↑

Thu Jul 19, 2018 11:00 pm

Firecapt32 wrote: ↑

Thu Jul 19, 2018 8:27 pm

Uh, I have. I understand the aft CG, stores, etc. But I didn't have such a pronounced pitch up until recently. I trim the nose half-way down prior to takeoff, half stick back on takeoff roll, etc. But again, I don't get the same effect in the E.

Odd, no changes made in the pitch axis in the last update...is it happening in the S, J or both?

Also, the pitch up tendecy is slightly higher in the J/S than in the E due to a significative more aft CG in the naval versions resulting in different takeoff techniques.

I honestly haven't tried it in the J model yet. I'll play around with it over the weekend.

Firecapt32 wrote: ↑

Fri Jul 20, 2018 2:17 pm

JonathanBleeker wrote: ↑

Thu Jul 19, 2018 9:06 pm

You don't have the E ADV correct? I think there is insufficient nose down trim. The ADV is way more sensitive to things like this....Speed changes will change your trim setting.

I will put in a little more nose down trim for takeoffs in the J/S to see what happens.

You do need to in the J/S...

I put a considerable amount more of nose-down trim prior to takeoff and the pitch-up has lessened.

Re-trim after takeoff as well.