Power settings

[RAF_Quantum]

Hi John,

Thanks for that. To a certain extent this thread died of natural causes as there are so many variations on a theme especially with the accuracies, NOT, of the FS FDE's. Whatever works for individual pilots is fine, these are just a rough starting point. Happy flying.

Rgds

John

[Chris Trott]

I'm new around here so excuse me for jumping in on an old item, but I believe I can correct these figures. The established cruise settings for a DC-3 are 30" MAP/2050 RMP.

John, the numbers are out of the manual for the R4D-6/DC-3"D" which uses Pratt & Whitney twin wasps instead of Curtiss Wright Twin Cyclones which is what the default models. The 30"/2050 is correct for CW engines.

This is also the power setting we use on the R4D-6 "Ready4Duty" N151ZE, an R4D-6S.

[johnhinson]

John, the numbers are out of the manual for the R4D-6/DC-3"D" which uses Pratt & Whitney twin wasps instead of Curtiss Wright Twin Cyclones which is what the default models. The 30"/2050 is correct for CW engines.

Roger that, Chris, I wasn't going by FS models so much as what I have
seen in the real world which no doubt was of the engine type you say.
Thanks.

John

[Chris Trott]

It comes down to the different prop used on the engines that changes the prop RPM setting, but I know from my few flights in "Ready4Duty" that the P&W engines really don't like it when you're using anything other than round hundreds of RPM (1000, 1100, 1200, etc). I don't know if it has to do with the prop governor or not, but a wierd vibration sets up in the engines and you get a pretty pronounced fluctuation in fuel flow when you try and use the Curtiss-Wright prop settings. It's kinda like the difference between the Hamilton-Standard Props and Aeroproducts props on the CV-580 or the two Hamilton-Standard prop designs used on the CV-240/340/440. They all have unique handling attributes and if you mix up which one you're operating, some odd things happen.

[simondix]

I know this is an old thread but are there any power setting figures for the Viking anywhere. I have seen the FSNav settings but cannot find the power settings.

[RAF_Quantum]

D A V E !


Hang fire Simon, I'm sure Dave would have heard that ;-)

John

[Rick Piper]

Hi Simon

Viking 1B (Bristol Hercules 634) 1,690 hp

Empty Weight 23,000 lb
Gross Weight 34,000 lb (24-27 seats)
Admiral Class 36,712 lb (36 seats)
Initial Climb rate 1,500 fpm
Max speed 263 mph
Maximum Range 1,700 nm
Cruise altitude - 3,000 - 10,000 Feet
Max Altitude is 25,000 ft
Max Takeoff power 2,800 RPM +6.75 lbs boost
Max Climb power 2,400 RPM 3.5 lbs Boost, cyl temp 270, Oil 90 deg C(1 hour max) @ 130 mph
Max Continuous rich 2,400 RPM , 3.5 lb Boost, Cyl temp 270, Oil temp 80.
Max Continuous Weak 2,200 RPM, 0 lbs Boost, Cyl Temp 250, Oil temp 80.

Recommended Cruise power 2,300 RPM, 2.5 lbs boost @ 12-17,000 ft

Max cylinder temp for stopping engines 230 deg C.

Not sure how accurate these are as they are from a book i bought recently and have not even loaded Viking for 3 years.

Regards
Rick

[DaveB]

S T R E W T H..

I've just gone through all of this thinking it was a new thread! :roll: :brick:

The published FSNav figures are based on a climb setting of 2500/+4.5 and a cruise at 8000ft of 2400/+3.9.. and in accordance with information previously received from the maestro ;-) The Boost gauge isn't calibrated in lbs but it will show lbs if you leave the cursor over it. Basically.. 45inhg = 4.5 boost and 39inhg =3.9 boost. The VC1 trio were never the most complete panels ever released but there you go ;-)

EDIT.. having just read Ricks figures.. mine are NOT IAW are they. That said.. this is what I got off him when the aircraft was released and you have to go with what you have. I recently acquired Airlines and Airliners - Vickers Viking but have thus far only looked at the pictures

ATB

DaveB :tab:

[Garry Russell]

That Viking books is good Dave but there's nowt technical as such in that series.

Still nice pics and about thirty paints I got from that

Garry

[simondix]

Thankyou very much gentlemen. I will try both sets and see what comes out of it. I am doing the training flights at the moment so I presume it will cost the firm nothing. I will let you know what I get.