When can you call "Positive rate!"?
I'm practising go-around procedures and need to call "Positive rate" when it is positive. But when can you say that? I give you 3 options here to make it easier.
1. V/S (Vertical speed indicator) shows over 0 fpm. (Ex: +50 fpm)
2. V/S is moving upward to 0 fpm. (Ex: -200 fpm, the needle continues moving up.)
3. Altimeter is increasing. (Ex: 300 ft -> 320 ft)
There are points to discuss.
1-a. For small aeroplanes, they can't actually climb when the gear is down, so you have to retract it right after full power is applied, otherwise it will never climb in some conditions.
1-b. For big jets (multi-engine), even with one engine is inoperative, they are no problem with climbing. If you are close to the runway and going around, you may touch the ground and continue climbing, so it is not very late that retracting gear when you are pretty sure that you are climbing.
2. V/S is the most unreliable instrument and has a lot of lag. You can assume A/C is gaining the altitude when V/S is positively moving up.
3. Altimeter is more reliable than V/S.
Which option would you like to choose, 1, 2, 3 or other choice? Please let me know.
Thank you in advance.