wuffman Posted October 23, 2013 Posted October 23, 2013 It seems as though there is NO rpm drop when checking #1 and #2 mags during pre-takeoff runup. Is the engine not supposed to drop a bit if only 1 mag is switched on? Or is this too much YouTube "how-to"?:huh:
Hadwell Posted October 23, 2013 Posted October 23, 2013 if you turn off the auto pitch yes the rpms will drop, but the auto pitch keeps your rpms constant. My youtube channel Remember: the fun is in the fight, not the kill, so say NO! to the AIM-120. System specs:ROG Maximus XI Hero, Intel I9 9900K, 32GB 3200MHz ram, EVGA 1080ti FTW3, Samsung 970 EVO 1TB NVME, 27" Samsung SA350 1080p, 27" BenQ GW2765HT 1440p, ASUS ROG PG278Q 1440p G-SYNC Controls: Saitekt rudder pedals,Virpil MongoosT50 throttle, warBRD base, CM2 stick, TrackIR 5+pro clip, WMR VR headset. [sIGPIC][/sIGPIC]
Mike Busutil Posted October 23, 2013 Posted October 23, 2013 (edited) What RPM are you running up to for the mag check? Ignition system check: At 2300 RPM, with the propeller in full INCREASE, move ignition switches from BOTH to L, back to BOTH, then to R, and back to BOTH. Allow engine speed to stabilize at BOTH between checks. A maximum drop of 100 RPM is allowable for the right magneto and 130 RPM drop for the left magneto. Edited October 23, 2013 by Mike Busutil [sIGPIC][/sIGPIC] Checkout my user files here: https://www.digitalcombatsimulator.com/en/files/filter/user-is-Mike Busutil/apply/
howie87 Posted October 23, 2013 Posted October 23, 2013 if you turn off the auto pitch yes the rpms will drop, but the auto pitch keeps your rpms constant. What do you mean "turn off the auto pitch"?
ED Team Yo-Yo Posted October 23, 2013 ED Team Posted October 23, 2013 What do you mean "turn off the auto pitch"? I think, he's kidding, but everybody can really turn it off setting the MP to have actual rpm less than the rpm set with prop lever. Ніщо так сильно не ранить мозок, як уламки скла від розбитих рожевих окулярів There is nothing so hurtful for the brain as splinters of broken rose-coloured spectacles. Ничто так сильно не ранит мозг, как осколки стекла от разбитых розовых очков (С) Me
Echo38 Posted October 23, 2013 Posted October 23, 2013 (edited) In the P-38, there was a switch for each propeller to manually increase & decrease the pitch (rather than using the propeller levers to set the desired RPM for the governor to maintain via automatically adjusting the pitch). The pre-takeoff run-up check in the P-38 involved using these switches. However, I'm unaware of such a switch in the P-51D. (I'll feel very silly if there is.) Edited October 23, 2013 by Echo38
xxJohnxx Posted October 23, 2013 Posted October 23, 2013 There is not really the need for one, as long as you don't give so much throttle that the prop can reach the desired rpm. Because, as long as the prop is spinning slower than you set with the rpm lever, the rpm of the prop will change withe throttle and not with bladepitch. If you do that mag test with full power you won't notice any rpm drop, as the governor will correct the rpm drop. If you move the prop lever all the way forward, and then increase the throttle until the rpm is 2300, the rpm will drop when you do the mag test, as the governor can not correct the rpm drop. Check out my YouTube: xxJohnxx Intel i7 6800k watercooled | ASUS Rampage V Edition 10 | 32 GB RAM | Asus GTX1080 watercooled
Echo38 Posted October 23, 2013 Posted October 23, 2013 There is not really the need for one, as long as you don't give so much throttle that the prop can reach the desired rpm. As I understand it, the manual-pitch switches on the P-38 were there in case the governor failed ... a clumsy back-up system which could enable the pilot to limp back to base. 1
wuffman Posted October 24, 2013 Author Posted October 24, 2013 (edited) What RPM are you running up to for the mag check? Ignition system check: At 2300 RPM, with the propeller in full INCREASE, move ignition switches from BOTH to L, back to BOTH, then to R, and back to BOTH. Allow engine speed to stabilize at BOTH between checks. A maximum drop of 100 RPM is allowable for the right magneto and 130 RPM drop for the left magneto. Mike, This is what I was looking for, @ 2300 rpm. Gonna try yet again, but still did not see that 100-130 rpm drop. TY for the reply. If you guys say it's modeled, then it has to be cockpit error. Edited October 24, 2013 by wuffman
howie87 Posted October 25, 2013 Posted October 25, 2013 Mike, This is what I was looking for, @ 2300 rpm. Gonna try yet again, but still did not see that 100-130 rpm drop. TY for the reply. If you guys say it's modeled, then it has to be cockpit error. That's MAXIMUM drop. Usually it is barely noticeable. In the Cessna I fly in real life it is quite noticeable however.
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