Anyone has a link to Maltby's Comet 4 manual?

[blueaircraft]

Hello everyone, I am looking for a link on how to properly fly David Maltby's Comet 4 for FS2004. I am not looking for the thread that the admin aerofoto created a little while back, but there was a manual on David Maltby's website which has been dead the last time that I checked. Does anyone have a link? If it helps, I am looking for the proper powerband in which the Comet 4 (4C in particular) should be at during takeoff and climbing so that the engines may not overheat. Proper takeoff settings concerning fuel and whatnot can also be of help to me.

Regards,
Andrew

[Klaus Hullermann]

Here you go (accessable via the Internet Archive): web.archive.org/web/20181223015209/http://www.dmflightsim.co.uk/html/Comet/Manual.htm

It should also work with the rest of his old webpage.

Klaus

[blueaircraft]

Strange, I thought that his website had a different manual. But I've found what I am looking for! Thanks for helping out Klaus 🙂

Regards
Andrew

[Klaus Hullermann]

Glad I could help.

Klaus

[aerofoto - HJG Admin]

I see you're a new HJG forum registration as of today "BLUEAIRCRAFT", so, you may not be fully aware of what we/HJG actually offer in regard to support for each of the DMFS simulations.

A point I want to make in regard to manuals for these simulations is as follows ....

Last year we discovered "some of" (not all of) the DMFS data available per the WAY BACK MACHINE was actually "incomplete". This became evident when comparing the data I downloaded and/or C&P'd from the DMFS site during 2019 with that currently accessible per the WBC. I've previously made reference to this fact a few times here both internally and publicly.

For this reason when we imported the DMFS products to HJG (these remain the property of DM though) I began compiling our own versions of manuals for each of the DMFS simulations, but, only those for the TRIDENT, VC10, and VC10/C1K have so far/to date been completed and are available "HERE" as follows ....


HS TRIDENT
tonymadgehjg.proboards.com/thread/9975/hs121-trident-manual

VC10
tonymadgehjg.proboards.com/thread/9976/vc10-manual

VC10/C1K
tonymadgehjg.proboards.com/thread/9977/vc10-c1k-manual


Again our forum based manuals for each of the 3 above-linked DMFS simulations are "COMPLETE".

However our forum based manuals for each the following 2 DMFS simulations are "yet to be completed" .... by me .... "as both time and personal circumstances permit" ....


BAC ONE-ELEVEN 200/300/400/475/500/510ED ("SECTIONS 1 to 4" only currently available)
tonymadgehjg.proboards.com/thread/9973/bac-eleven-manual

COMET III/IIIB/IV/IVB/IVC ("SECTIONS 1 to 4" only currently available)
tonymadgehjg.proboards.com/thread/9974/dh106-comet-manual


"SECTIONS 1, 2, 3, 4" of manuals for each of the 2 above-linked and DMFS simulations are "COMPLETE" also .... again in accordance with the last version DMFS compiled data (I did this purposely in order to maintain as much fidelity with the original DMFS data as possible), but, "SECTIONS 5 and 6" of these same manuals have yet to be completed and added .... by me.

I particularly want to stress that "SECTIONS 2 and 3" of all of these HJG forum based manuals have been compiled "almost totally in accordance with the original DMFS manuals/data" (last versions) .... albeit this data, as presented "HERE", is in a PROBOARDS/HJG forum type format for reasons of both "convenience" and "uniformity" in regard to "the manner in which HJG presents this sort of technical referencing".

SECTIONS 1, 5, and 6 of these manuals are also based on the original DMFS data but have, by necessity, been edited to .... (a) better/more thoroughly present/explain each DMFS simulation .... (b) account for the fixes we/HJG have applied to each of the DMFS panels .... and (c) better educate end users to how best fly and enjoy these simulations.

No time frame, as yet, in regard to when "SECTIONS 5 and 6" of the BAC ONE-ELEVEN and COMET manuals (only) will be added .... since preparing this data is quite a lengthy/tiring albeit necessary undertaking. As DM compiled some these simulations differently (weight-wise and engine thrust-wise etc) some of them fly differently .... as should be the case .... and as a result each needs to be "properly/individually analysed" before final and reliable referencing can be compiled and presented.


FYI also "BLUEAIRCRAFT"

I am looking for the proper powerband in which the Comet 4 (4C in particular) should be at during takeoff and climbing so that the engines may not overheat.

That particular fidelity (engine burn-up and failure due to prolonged use of excessively high power settings) "IS" applicable to the DMFS BAC ONE-ELEVEN panels, but AFAIK, doesn't apply to the either the DMFS COMET, TRIDENT, and VC10 panels. The COMET panel/simulation/s represent turbojets .... so .... you'll be using/maintaining "near" maximum power throughout TO, climb, and cruise flight regimes. According to notes I've so far compiled .... at MGW I've recorded MAX POWER for TO, then, reducing to around RPM 7450 after TO and clean-up .... for the COMET IV only. The rest do each differ slightly.

Just to remind everyone also ....

We/HJG (George CARTY actually) fixed all of the known the faults associated with the DMFS released COMET, BAC ONE-ELEVEN, TRIDENT, and VC10 panels .... as well as also making each of these simulations more FSX portable too and whilst not impacting either their original look or functionality.

Mark C
AKL/NZ

[aerofoto - HJG Admin]

For what it's worth here's the performance data (my recommendations) I've recorded using the DMFS COMET 4 ....

DH106 COMET IV - "RECOMMENDED MGW LOADING/TO/CLIMB & CRUISE PROCEDURES".

4X RR AVON Mk 524 turbo-jet engines rated at 10,500 lbs thrust each.

MTOW 152,000 LBS

FUEL & PAYLOAD ADJUSTMENT (for MGW departure) ....

Default Overload = 346 LBS

LEFT = 100 %
CENTER = 97.8 %
RIGHT = 100 %

No payload adjustment .... results in 16 LBS overload

PANEL = "DMFS COMET"

TRIM = 4 units
SLAT/FLAPs SETTING = 20* (1 notches)
MAX T/O THRUST = RPM 100 %
V1 = 117
VR = 127
V2 = 139
VAT = 138
INITIAL ROC = 2,000 FPM
FLAPS RETRACT = 220 KTS .... increase ROC to 2,500 FPM
TARGET AIRSPEED BELOW 10,000 FT = 250 KTS.

Maintain 2,000 FPM ROC after Gear and Flaps retraction (by 3,000 FT) .... reduce engine thrust to RPM 7,500 then assume the following ROC climb and airspeed/power adjustment schedule .....

- 10,000 FT reduce ROC to 2,000 FPM @ RPM 7,450
- 15,000 FT reduce ROC to 1,800 FPM @ RPM 7,450
- 20,000 FT reduce ROC to 1,500 FPM @ RPM 7,450
- 22,000 FT reduce ROC to 1,200 FPM @ RPM 7,450
- 24,000 FT reduce ROC to 1,000 FPM @ RPM 7,400
- 26,000 FT reduce ROC to 800 FPM @ RPM 7,350
- 28,000 FT reduce ROC to 500 FPM @ RPM 7,250
- 30,000 FT reduce ROC to 200 FPM @ RPM 7,200
- 31,000 ALT CAPTURE @ RPM/ 7,150

FL310 MACH 0.79 CRUISE PERFORMANCE ....

IAS = 300
GS = 465
TAS = 492 (300 X 1.64 = 492)
MACH = 0.79
RPM = 7,150
F/F = 1,075 KG per engine (4,300 KG total)
AI = +1*


DH106 COMET IV COMET IV - "RECOMMENDED MAX PAYLOAD DESCENT & APPROACH TO LANDING PROCEDURES".

Descending from FL310 ....

- 110 DME from destination airport .... reduce airspeed to 290 KTS (RPM 7,000) .... maintain level flight to aid airspeed reduction to less than 300 KTS prior to commencing descent.

- 100 DME from destination airport .... commence 2,000 FPM ROD (RPM 6,500).

- 17,500 FT .... adjust QNH 2991/1012 (RPM 6,450).

- 10,000 FT .... reduce ROD to 1,000 FMP .... and reduce airspeed to 250 KTS (RPM 6,400).

- "DO NOT" commence approach to landing with in excess of 20% total fuel remaining.

- Commencing the approach to landing from 18.5 DME is most advantageous for these recommended approach to landing procedures.

- Downwind legue = 250 KTS reducing to 220 KTS (RPM 6,500).

- Base Legue = 220 KTS reducing to 200 KTS (RPM 6,350).

- Engage Auto-approach (select AP "BEAM" mode).

- FINAL APPROACH = 200 KTS reducing to 180 KTS (RPM 6,300).

- Yaw Damper = OFF".

- Select FLAPS 20 = 200 KTS.

- ILS/GS intercept = 180 KTS

- Select gear down = 180 KTS

- Select FLAPS 30 = 175 KTS.

- Reduce airspeed toward 118/117 KTS.

- Select FLAPS 40 = 155 KTS.

- Select FLAPS 60 = 145 KTS.

- Approach to landing airspeed (full flaps) = 118/117 KTS (VAT).

- Touchdown airspeed = 108/107 KTS.

- Manually deploy Wing Spoilers.

- Engage reverse thrust at idle RPM (reverse is available on engine #1 and #4 only).

- 80-60 KTS = cancel reverse thrust .... retract wing Spoilers and Flaps.

- Taxi to gate/stand.

The above is what I've recorded .... so far (but needs to be further analysed). It's "the way the simulation wants to fly" in its "currently unedited FDE form". The above data and recommendations are applicable to COMET IV only .... but not to COMET III/IIIB/IVB/and IVC. I have noted the DM recommended data is "slightly off-spec", but, is otherwise OK "if one re-adjusts the simulation so as to fly as recommended".

Mark C
AKL/NZ

[blueaircraft]

Thank you very much Mark! And I appreciate my welcoming to the forums I took note of and applied the powerband that you recorded for the Comet IV (the C in particular even though you recommended that powerband for the original 4) and it flew quite well to cruising altitude. No hiccups, no over speeding, and no stalling or long way to cruising altitude either! I haven't reached my destination as yet (my "non-flying" schedule leaves me with little time to fly my passengers to their virtual destination) but I will see how well the 4C will react to your recorded descent and approach speeds.


Andrew