July 10, 20241 yr Author On a recent trip in a PMDG T7, on a flight from Berlin to Dublin, using the FMC with the following settings of Flaps 5, TO2, 42C FMC calculated V1=141; VR=145; V2=153 For Simbrief, using exactly the same weights and take off settings I got: V1=144; VR=146; V2= 156 So, a max 3kt difference in some speeds which I think is OK. Spoiler System specs: MFG Crosswind pedals| ACE B747 yoke |Honeycomb Bravo throttle Now built: P3Dv5.3HF2: Intel i5-12600K @4.8Ghz | MSI Z690-A PRO | Asus Dual RTX 4070 Super OC 12Gb| 32Gb Corsair Vengeance LPX DDR4 3200Mhz |Samsung 980Evo Pro PCIe 500Gb | WD Black SN850 PCIe 2Tb | WD SA510 4Tb |beQuiet 802 Tower Case|Corsair RM850 PSU | Acer Predator X34P 3440x1440p Mark Aldridge MSFS 2024 SU2 & P3D v5.3 HF2
July 10, 20241 yr 4 hours ago, 787flyer said: So, a max 3kt difference in some speeds which I think is OK. Mark, I agree. 1-3 knots is acceptable. I will always make my final decision for Vspeeds, particularly V2 and Vapp based on those calculated in the EFB and FMC. Usually they (EFB & FMC) match,or are 1 kt difference, but when they don't match I tend to go with the EFB. I use those from Simbrief as a starting point, and particularly to get the derate and sel temp. My method may be backwards or such, but it works for me. Glenn Wilkinson Spoiler My specs: AMD Ryzen 5 5600X @ 3.7 GHz, 32 GB 3200MHz DDR4, NVIDIA GeForce RTX 2060 12 GB, 2TB SAMSUNG EVO Plus SSD M2, 2TB WD Black Gaming SSD M2, 8TB WD Black Gaming HDD, 4TB WD Black Gaming Ext HDD, Windows 10, X-Plane 12 + large quantity of 3rd party addons scenery & aircraft. Honeycomb Alpha & Bravo, Thrustmaster TFRP. It's an older machine but gets the job done quite nicely - smooth with no stutters!
July 11, 20241 yr Author 22 hours ago, beechcaptain said: Mark, I agree. 1-3 knots is acceptable. I will always make my final decision for Vspeeds, particularly V2 and Vapp based on those calculated in the EFB and FMC. Usually they (EFB & FMC) match,or are 1 kt difference, but when they don't match I tend to go with the EFB. I use those from Simbrief as a starting point, and particularly to get the derate and sel temp. My method may be backwards or such, but it works for me. Good. I am doing the same as you Glenn. 👍It does not seem backwards to me. I did read somewhere that the EFB is more accurate than the FMC. I dont pretend to know all the field and obstacle limitations that can apply, but If I remember correctly the EFB should take these into account but the FMC not. Providing the FMC and EFB match within 1-2 kts of each other, the EFB take off speeds take precedence and are the ones I use. Of course it all depends upon the fidelity of the EFB you have at your disposal and what it can do. And yes, I use the Simbrief ones as a "ball park" figure so that when my aircraft payload and fuel is set, I have an independent source to help verify my plane is set up correctly. So its good to hear that we apply the same approach. Spoiler System specs: MFG Crosswind pedals| ACE B747 yoke |Honeycomb Bravo throttle Now built: P3Dv5.3HF2: Intel i5-12600K @4.8Ghz | MSI Z690-A PRO | Asus Dual RTX 4070 Super OC 12Gb| 32Gb Corsair Vengeance LPX DDR4 3200Mhz |Samsung 980Evo Pro PCIe 500Gb | WD Black SN850 PCIe 2Tb | WD SA510 4Tb |beQuiet 802 Tower Case|Corsair RM850 PSU | Acer Predator X34P 3440x1440p Mark Aldridge MSFS 2024 SU2 & P3D v5.3 HF2
July 11, 20241 yr Well, Mark, as the saying goes, "Great minds think alike!" 😉 Edited July 11, 20241 yr by beechcaptain grammar Glenn Wilkinson Spoiler My specs: AMD Ryzen 5 5600X @ 3.7 GHz, 32 GB 3200MHz DDR4, NVIDIA GeForce RTX 2060 12 GB, 2TB SAMSUNG EVO Plus SSD M2, 2TB WD Black Gaming SSD M2, 8TB WD Black Gaming HDD, 4TB WD Black Gaming Ext HDD, Windows 10, X-Plane 12 + large quantity of 3rd party addons scenery & aircraft. Honeycomb Alpha & Bravo, Thrustmaster TFRP. It's an older machine but gets the job done quite nicely - smooth with no stutters!
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