Unknown high pitch tone

[No1sonuk]

There's a high pitch tone I can hear while flying until I increase the throttle a bit.  What is it?

[MAXsenna]

There's a high pitch tone I can hear while flying until I increase the throttle a bit.  What is it?

Just watched@Reflected 's startup/taxi/takeoff/landing/shutdown video. He claimed it's the most annoying sound he ever heard!
It's the low altitude/landing gear alarm. Apparently, if you're low with the gear retracted and the throttles are pulled back to a certain degree, it turns on.

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[No1sonuk]

Thanks.  That makes sense.
I was looking for a warning light or an engine problem.

[MarcT-NL]

It has nothing to do with altitude I believe. The P-51 has this too. Whenever you throttle back to almost idle, and the gears are up, you will get a warning-sound. Extremely annoying in the Mossie's case.

In the P-51 you have a silencer-button though. Doesn't the Mosquito have this ?

[Nealius]

I'm wondering if the Mossie's warning setting is to high up on the throttle range. It's impossible to run at standard cruise (+7/2650) without getting the warning when below 2,000ft or so.

[Eldur]

6 hours ago, MarcT-NL said:

In the P-51 you have a silencer-button though. Doesn't the Mosquito have this ?

 

TBH I'd kill a mosquito (pun intended) to get that button. The annoying thing is that it literally starts at the cruise setting of 2650/+7, so basically at a rather high power setting that's very far from landing configuration. You basically can't fly at slower speeds without having your ears blasted at by the horn.

[Richard Dastardly]

I believe it's warning you the engines are idling & you're not supposed to idle piston engines for long in case they cool off, but it could be something else. Anyone tried shutting the radiator flaps when it happens?

Edited September 18, 2021 by Richard Dastardly

[MAXsenna]

I believe it's warning you the engines are idling & you're not supposed to idle piston engines for long in case they cool off, but it could be something else. Anyone tried shutting the radiator flaps when it happens?

Like I wrote. @Reflected explains it all in his video, and the sounds goes off when he drops the gear. If it is correct? I have no clue, but he has pretty decent history of doing correct research.

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[Richard Dastardly]

12 minutes ago, MAXsenna said:

Like I wrote. @Reflected explains it all in his video, and the sounds goes off when he drops the gear. If it is correct? I have no clue, but he has pretty decent history of doing correct research.
 

Still does it at 25k feet so yes nothing to do with altitude. Given it doesn't go off if you pull one throttle then yes, can't really be an idle warning ( you'd expect an idle warning to stop sounding with the gear down, or sitting on the ground would be horrendous ).

[MAXsenna]

Still does it at 25k feet so yes nothing to do with altitude. Given it doesn't go off if you pull one throttle then yes, can't really be an idle warning ( you'd expect an idle warning to stop sounding with the gear down, or sitting on the ground would be horrendous ).

Haha! Okay, THAT is probably not correct.

EDIT: Fly with gear down at any altitude, problem solved.
On a serious not. I would like to know what's actually correct.

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[MarcT-NL]

The sound is a warning. The plane is telling you that you are idling your engines, but your gear isn't down yet. It is a safeguard for forgetting to put the gear down when landing.

However, a pilot should be allowed to idel the engines as the situation requires, so there ought to be a silencer-button. I don't know if that is the case in the real Mosquito. If not, and I had to fly the thing, I would sabotage the warning-sound.

[Dusty44]

On 9/18/2021 at 8:00 AM, Nealius said:

I'm wondering if the Mossie's warning setting is to high up on the throttle range. It's impossible to run at standard cruise (+7/2650) without getting the warning when below 2,000ft or so.

I think that too. Three of us did the Amien raid and we had to fly slow as per the brief and we had the whine in our ears. It’s actually only on one engine ( can’t recall ) so I left that one higher power above whine and decreased the other then compensated with rudder. Not ideal.

 

Edit ( the warning comes on if both engines are closed, or there about a, as long as one is open the horn will stay off. It doesn’t matter which )

Edited September 22, 2021 by Dusty44

[bell_rj]

Yes agreed. I flew The Channel Free Flight mission last night where you can follow two Mossies on a tour of the RAF fields. To stay at their speed I had to reduce throttle to where I had the warning horn constantly. Perhaps its realistic, I don't know, but it doesn't feel right to me.

[dresoccer4]

+1 i almost went insane from this awful noise. someone please say there's a silence key. this could not be good for troop moral  

[pocketedition]

dresoccer4

 

For take-off I gave it not full throttle, not totally maxed out.

Once airborne I left the throttles alone and controlled rpm's with that prop pitch thing.

Not feathering the props, it's the grey levers on the throttle quadrant.

If the throttles are pulled back, it sets off the alarm. If the prop rpm's are adjusted the alarm doesn't kick off.

Cut the plane a bit of slack, it was made in England.

 

Aileron trim, yep me too. Maybe the huge fans on the wings turning the same way.

 

Artificial horizon, yep, me too. Scratched me head over that one.

 

Wait till you try the pitch trim? Sky dirt sky dirt sky dirt. I'm going to try some adjusting on that. Tally ho

Edited September 23, 2021 by pocketedition

[dresoccer4]

3 hours ago, pocketedition said:

dresoccer4

 

For take-off I gave it not full throttle, not totally maxed out.

Once airborne I left the throttles alone and controlled rpm's with that prop pitch thing.

Not feathering the props, it's the grey levers on the throttle quadrant.

If the throttles are pulled back, it sets off the alarm. If the prop rpm's are adjusted the alarm doesn't kick off.

Cut the plane a bit of slack, it was made in England.

 

Aileron trim, yep me too. Maybe the huge fans on the wings turning the same way.

 

Artificial horizon, yep, me too. Scratched me head over that one.

 

Wait till you try the pitch trim? Sky dirt sky dirt sky dirt. I'm going to try some adjusting on that. Tally ho

 

 

i hadn't even noticed they were spinning the same way, i just assumed twins always had counter-rotation. 

 

i've gotten the pitch trim ok for now, just have to fiddle with it often. i've been softening the pitch curves quire a bit and it's made it more manageable for now. def a learning curve

[ac5]

On 9/22/2021 at 9:55 AM, bell_rj said:

Yes agreed. I flew The Channel Free Flight mission last night where you can follow two Mossies on a tour of the RAF fields. To stay at their speed I had to reduce throttle to where I had the warning horn constantly. Perhaps its realistic, I don't know, but it doesn't feel right to me.

Indeed. It does not feel right at all. And now with the "new" crypted sounds, one is not even able to edit the sound files. Very annoying indeed, ED.....

[rkk01]

I get the warning buzzer with wheels down, on the runway, idling and with engines shut down…!!!

only way to kill it is to kill the master power switch

[MarcT-NL]

This can't be right: So the warning-sound starts at boost 7. And the continues max boost is also 7 according to the kneepad !!!  Are we supposed to listen to the warning the whole time ?

 

On 10/15/2021 at 5:05 PM, rkk01 said:

I get the warning buzzer with wheels down, on the runway, idling and with engines shut down…!!!

only way to kill it is to kill the master power switch

Then your gear is damaged.

Edited October 20, 2021 by MarcT-NL

[dresoccer4]

Is the alarm supposed to be on during the full descent?

[ac5]

19 hours ago, MarcT-NL said:

This can't be right: So the warning-sound starts at boost 7. And the continues max boost is also 7 according to the kneepad !!!  Are we supposed to listen to the warning the whole time ?

This can't be right indeed!