What's "Bogging"

[scallybert]

I've heard references to 'bogging' - what is it ? (I'm sure there's a bad joke referencing Yeovil in there, somewhere...)

I'm guessing it's where more 'throttle' stick increases the collective in a way that the motor is overwhelmed (can't produce enough torque to meet demand), leading to a drop in revs. Is this about right ?

What causes it ? What should you do about it, etc ?

[robgt]

I'm guessing it's where more 'throttle' stick increases the collective in a way that the motor is overwhelmed (can't produce enough torque to meet demand), leading to a drop in revs. Is this about right ?

Yes - bogging refers to the engine bogging down due to excessive demands made on it in flight.
Usually, the easiest way to rectify it is to ease off the collective.

Cheers,
Rob

[heliward0]

basically yea or where your trying to draw more power in a move and it boggs the motor down ( motor srains or strugles )

[xygax]

Ask Ron e will tell you...

[heliward0]

just beat me there rob.. where where you yesterday bud we waited to see you brilliance but you didnt show

[Boggy]

Ask Ron e will tell you...

its the hours of the early morning after a night at the viceroy in south street!!

[Eddie]

Ask Ron e will tell you...

Steve,

Were all waiting for it...................

[163phil]

its the hours of the early morning after a night at the viceroy in south street!!

....and do people come to watch?

[robgt]

where where you yesterday bud we waited to see you brilliance but you didnt show

Oh sorry mate... I take it you were over at the Coven field? I had no idea??
My 700 fuel tank needs replacing so I stayed over at my club in Shrewsbury to fly with the guys there. Sorry to have missed you!

Another time hopefully!
Cheers,
Rob

[heliward0]

Oh sorry mate... I take it you were over at the Coven field? I had no idea??
My 700 fuel tank needs replacing so I stayed over at my club in Shrewsbury to fly with the guys there. Sorry to have missed you!

Another time hopefully!
Cheers,
Rob

there will be a next time no doubt mate

[electricsceadu]

"Bogging"
the act of filling the bog after a very large curry

[scallybert]

Ask Ron e will tell you...

I think that's covered by "I'm sure there's a bad joke referencing Yeovil in there, somewhere..."...

basically yea or where your trying to draw more power in a move and it boggs the motor down ( motor srains or strugles )

Assuming you have a governor:
1) This is going to adjust the motor's throttle input to maintain revs;
2) The revs the governor is set to will mean the motor is at suitable revs to make adequate torque.

(?)

Over geared ?

[Ade_Law]

when you set a model up you set the collective pitch so that your at full throttle at full collective.

trouble is that adding cyclic or traveling fast sideways means that the head or tail need more power to maintain the RPM.

if your at full collective and using lots of cyclic then your using more power than you have available so the headspeed drops (bogs)

this is where the term collective management comes from. making sure that the total load isnt more than the engine can put out.

if you imagine having a collective of 0 - 100 starting from mid stick and having the same for the cyclic. the 2 added together should never be more than 100. so you could use half collective and half collective together and not bog it.

hope this makes sense!

Ade

[scallybert]

when [...]

Thanks that's interesting.

I'd naively thought that if you have a governor, and the motor can produce enough torque to deal with full collective at the governed RPM, then you should be ok.

I'd also expected that cyclic wouldn't have a significant effect, as while one blade would have increased pitch (more drag), the other would have a correspondingly decreased pitch (less drag), so they'd roughly cancel out.

Apparently this isn't what happens in practice...

I suppose that if you're pulling out of a dive, the blade with increased pitch will be facing into the direction of travel, whereas the one with reduced pitch will facing the other way. So in that case the collective pitch will have a significant effect on head torque.

When you talk about 'collective management', you mean manage your stick inputs in that way ?

I did a search on the term, and found a CSM device that would back off collective if the revs dropped below what was set on the governor. I guess there will be more of this as flybarless systems become more common and sophisticated.

[steelie600]

the cyclock i think its called works in conjunction with the lastest revlock governor its a fantastic idea but a good pilot shouldnt need it. I do need it however but an trying to manage my sticks so that i can do it myself