Have reacquainted myself with the JBK Tudor 4 and begun doing some route flying with this aircraft. One thing I have noticed is that the aircraft tends to fly in a slightly nose down attitude even when trimmed and the VSI on zero. Is this normal for the Tudor or can the .cfg file be tweaked to correct this? It doesn't seem to affect cruising speed etc. or the handling but it just looks odd.
I recall reading quite a long time ago that the Handley Page Hermes actually flew slightly nose down due to HP using the Halifax wing in the design. Could the Tudor be in the same boat with Avro using the Lincoln wing?
Post by mrcapitalism on Apr 5, 2021 22:55:12 GMT -5
Can you provide some operating conditions to help diagnose? What altitude? Weight? KIAS? Power settings? OAT? This sounds like the case of an operating error with what FSAviator describes as a "pimped ride"
Lots of British planes flew nose down in real life though. The Whitley, HP.42, and Short Scyllia to name a few. The Avro York is often seen with a nose down attitude in flight but examining Tudor in flight photos, they seems to fly as expected from the PT. I have flown the JBK Tudor quite a bit and never noticed any particular nose-down attitude unless fighting headwinds at maximum cruise power.
Hi, I have a similar problem with the Tudor 4. I wanted to recreate the interesting Super Trader flights of Freddy Lakers Aircharter London. These aircrafts flew regularly around half the world to Woomera in Australia. It has been proven that the pressurisation system on all Super Traders had been removed so that they flew in 7000 to 8000, max 10 000 ft. But when I try to adhere to the requirements for the cruise regime, the nose points very steeply downwards. If I try to take a more horizontal position, I have to reduce my speed so much that I nearly falls out of the sky. I fear that the FDE of the JBK model is incorrect for flights at these conditiones and altitudes. regards Manfred
Hi Manfred The Air Charter model is the one I have been using and like yourself staying around the 8000 to 9000 foot mark when in cruise mode. Did a leg from Bromma to Prestwick yesterday hand flying the aircraft to altitude and then manually trimming before switching on the auto pilot and altitude hold. This did improve the attitude of the aircraft but you could see that it was still flying slightly nose down. This was a big improvement on the earlier flight when the nose down attitude was far more apparent.
I agree with you that the FDE may need some tweaking which is something where I wouldn't know where to start. Am hoping someone has a solution.
Watched a number of videos on the Tudor last night including an interesting one on the Tudor VII with radial engines. Everything I saw showed that the aircraft flew in a nice straight and level attitude.
Had a test fly this morning and despite trying various trims before engaging the altitude hold and auto pilot you could see that the aircraft still had a slight nose down attitude. Maybe there is something that I'm not doing quite right but I can't see where. Still feel the aircraft's parameters need a slight modification.
I've been using the power settings as listed in the performance list that accompanied the download. But that is a good suggestion so I'll try different boost settings etc. and see how it goes. Am sure there is a solution to this.
The one you want is the cruise_lift_scalar. Put in 50% fuel (i.e. fuel in the tanks halfway along a long trip), get to the flight altitude you expect to fly at, engage the AP, and set desired cruise power. Wait for things to stabilize. Then edit that value (higher means more nose down), saving the file and reloading the plane each time. You should then be nose up at full fuel and nose down when light, which should be correct AFAIK.
Hi Tom Thank you for that addition to the .cfg file. I have set the "cruise_lift_scalar" line at 0.67 which seems to have pretty well fixed the problem. When I looked at the attitude of the aircraft after pressing the 4 or 6 key to get a side view, the aircraft looked level against the horizon. Had the aircraft trimmed and the AP and altitude lock on. The view from the cockpit looks better as well, with a bit more sky and less terrain as against what I had before.
MM would be interested to see what you found worked best.
Hi, I think cruise lift scalar 0.76 is ok for me. I took a 5 hour flight from London to Brindisi with 12 000 lbs of fuel and 70 000 lbs GW. Altitudes between 9,000 ft and 14,000 ft (the latter over the Alps with O²). The pitch was always just under -1 °, radiator shutters closed, speed around 166 kts IAS and fuel flow 1,400 lbs / hr. If I reduce the cruise lift scalar even further, the IAS drops too much I think and the fuel consumption increases. Thanks for the help and useful tips.