BAC-111 engines overheat

[MenInBlack]

Hello everyone, I hope I write this in the wright place... first of all let me say that this models (David Maltby's, at least) are truly amazing, payware standards, freeware prices , and very important TRULY COMPREHENSIVE manuals, unlike many others unfortunately..
Now, I have a small problem with BAC-111, flying it in "clear skies" weather conditions is OK, however selecting real world weather conditions or any other (I guess) weather theme, will always cause the engines to overheat, and eventually shut down short after I took off...even tho I activate the water injection...is there something I'm missing? And one more thing, activating Top Temp, will necessitate a 40km runway to be able to take off This is such a shame because it's such a neat plane...Any help - greatly appreciated!! Thanks!

[TSR2]

Hi MIB, and welcome

you've two options with the 1-11, either throttle back so they don't cook, or use the "Top Temp" switches to limit the temp automatically, from memory they're on the pedestal at the bottom

[DaveB]

Hello MIB

Ben is correct.. the 'Top Temp' switches are on the rear of the pedestal though I've never used them.. I don't do VC's Also true, I've never cooked the engines on the One-Eleven. With the aircraft fully configured for takeoff (flaps at the correct position and tailplane at the correct incidence), there is no problem getting her off the deck and you don't need the throttles to the stops. Keep the throttles with the RPM in the yellow and you'll be fine. They'll take a moment or two in the red but as soon as you see the lights come on.. throttle back enough for the lamps to extinguish. Even hot and high, you shouldn't fry the engines

ATB
DaveB

[cstorey]

When you say you require a 40km runway for takeoff, what altitude is this at ? At near sea level, even with high temperatures, you should not have any difficulty with the top temp switches engaged . You may need, however, to use a greater flap setting so that the rotation speed is reduced, and you may well need to use a very modest rate of initial climb to keep the temps in limits . However, you need to be aware that in the real world, at high density altitudes i.e a combination of runway altitude and high temperatures, there would be significant performance limitations requiring the all up weight to be reduced, usually by taking less fuel

[Garry Russell]

Welcome aboard

A lack of tailplane trim will prevent you taking off too.

I've tried it at Mexico City in the past a high temp and although longer the take off run was well within the runway.

[Garry Russell]

This does come up now and then

I've found the screenshot I took a while ago showing the Top Temp switches, VC cockpit only...if anyone reding this wonders what we mean

[cstorey]

Right - just tried it with the DM 1-11-200 of Danair, with max gross weight , top temp on , from Denver RW26 with a temperature of 50 C ( 122F) ! and no wind . This gives a density altitude of about 13500 feet . Using 18 degrees of flap , a nose up trim setting of about 4.5 degs and a rotation speed of 115 kts it unstuck just before the end of the RW and then climbed away at a rate of about 400 fpm. I then selected AP on and a climb rate of 200 fpm and the a/c gradually accelerated . You would never do something this marginal in the real world , but it illustrates that the model will cope with this absolute extreme of performance limitation. Are you sure you have not inadvertently used 0 degs flap, or applied spoilers ?

[Garry Russell]

What is you weight...are you overloaded??

[NigelC]

lol... RW 1-11 would start losing performance as soon as the sun came out!!

[Garry Russell]

So they were OK in Britain then!!??