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Hi again.
I found this review/settings for the 250. Can I put these setting in my transmitter?
I know typically that a 250 is not seen as a beginner's heli as it can be very twitchy and fast but given that it doesn't need a load of space to fly, is cheap to repair after crashing
ops: and an all round top little heli, I thought I'd share my TX settings (DX7) that can tame this fiery little beast into a very manageable CP beginner's heli, hopefully with a bit of an explanation of each setting I used.
Disclaimer here – I’m very much a newb but I never really found all this info in one place so hopefully it’ll help someone, but to you expert pilots this is probably sucking eggs territory! Of course the principles can be used on any heli, I just did a lot of research and applied it to my 250 as it’s a much more feisty heli.
First I will assume that you have centred the servos and set servo direction & interaction and levelled the swashplate throughout its range. Also that you know how to use a pitch gauge and take pitch measurements. I recommend the eBooks from rchelicopterfun.com if you need good setup guides.
Throttle Curve (Normal) - 0-80-80-80-80. The soft start on the ESC is really good and a flat throttle curve helps with stability, as the head speed is constant.
Swash Mix - Aileron: 50%, Elevator: 50%, Pitch: 40% I used Finless & Jasmine's set up guides from HeliFreak and took the suggested 50-50-50 as a starting point but after levelling the swashplate throughout the travel I found I was getting +/-13 degrees collective pitch which is quite high so reduced the Pitch mix to 40% which gave me -10-0-10 degrees.
Pitch Curve - With zero pitch at midstick, I find a good beginner's pitch curve is about -2 to +10 degrees, just a bit of negative pitch at low stick so that if the throttle is killed, as a beginner will often do, it won't drive the heli into the ground! To get the -2 to +10 degree range my TX curve was 40-45-50-75-100
OK, nothing radical here so far that you haven't seen in a thousand other posts.... Now I found a lot of posts now move straight on to setting 25% expo as a beginner's tool to reduce sensitivity around mid stick. Not that I'm against expo but before going there I'd suggest looking at cyclic pitch. Every site mentions setting collective pitch but not that many talk about cyclic pitch - basically how many degrees the swashplate tilts when you apply full positive/negative elevator/aileron. If you start with a standard swashmix of 60-60-60 the chances are you will get about 12 degrees of cyclic travel. This is a HUGE amount - unless you are a 3D stick banger it's unlikely you will ever need this much travel - 6-7 degrees is all you normally need as a beginner or for sport flying. With my 50-50-40 swashmix above I was getting about 9 degrees.
Now if you have a high amount of swashplate travel and use expo to tame things down around centre stick it works well until you (as a beginner) get into trouble and over compensate your stick movements and all of a sudden those 12 degrees in the opposite direction kick in very quickly because of that expo (travel is the same but the rate it's applied proportional to stick movement is different) and the heli piles sideways in to the ground. I speak from bitter experience here
So what’s the solution? Dual Rate. I found lots of sites mention DR but without much explanation as to how it works, except it reduces the amount of servo throw/travel but without relating it numerically to cyclic pitch. If you consider the 9 degrees of swashplate tilt I got with my 50-50-40 swashmix and then think of the maximum cyclic pitch you’d need for basic flying, probably about 6 degrees, you can see that if you set your dual rates to 66% that would limit the maximum amount of cyclic pitch to 6 degrees (6 being 66% of 9)
After you set DR you can add expo if you wish – I set my dual rates to 70% with 10% expo on Aileron and Elevator and 65% with no expo for the Rudder which is nice and stable and smooth for me but your preferences may vary!
Hopefully that will result in a nice stable, tame 250 for you!
I found this review/settings for the 250. Can I put these setting in my transmitter?
I know typically that a 250 is not seen as a beginner's heli as it can be very twitchy and fast but given that it doesn't need a load of space to fly, is cheap to repair after crashing
ops: and an all round top little heli, I thought I'd share my TX settings (DX7) that can tame this fiery little beast into a very manageable CP beginner's heli, hopefully with a bit of an explanation of each setting I used. Disclaimer here – I’m very much a newb but I never really found all this info in one place so hopefully it’ll help someone, but to you expert pilots this is probably sucking eggs territory! Of course the principles can be used on any heli, I just did a lot of research and applied it to my 250 as it’s a much more feisty heli.
First I will assume that you have centred the servos and set servo direction & interaction and levelled the swashplate throughout its range. Also that you know how to use a pitch gauge and take pitch measurements. I recommend the eBooks from rchelicopterfun.com if you need good setup guides.
Throttle Curve (Normal) - 0-80-80-80-80. The soft start on the ESC is really good and a flat throttle curve helps with stability, as the head speed is constant.
Swash Mix - Aileron: 50%, Elevator: 50%, Pitch: 40% I used Finless & Jasmine's set up guides from HeliFreak and took the suggested 50-50-50 as a starting point but after levelling the swashplate throughout the travel I found I was getting +/-13 degrees collective pitch which is quite high so reduced the Pitch mix to 40% which gave me -10-0-10 degrees.
Pitch Curve - With zero pitch at midstick, I find a good beginner's pitch curve is about -2 to +10 degrees, just a bit of negative pitch at low stick so that if the throttle is killed, as a beginner will often do, it won't drive the heli into the ground! To get the -2 to +10 degree range my TX curve was 40-45-50-75-100
OK, nothing radical here so far that you haven't seen in a thousand other posts.... Now I found a lot of posts now move straight on to setting 25% expo as a beginner's tool to reduce sensitivity around mid stick. Not that I'm against expo but before going there I'd suggest looking at cyclic pitch. Every site mentions setting collective pitch but not that many talk about cyclic pitch - basically how many degrees the swashplate tilts when you apply full positive/negative elevator/aileron. If you start with a standard swashmix of 60-60-60 the chances are you will get about 12 degrees of cyclic travel. This is a HUGE amount - unless you are a 3D stick banger it's unlikely you will ever need this much travel - 6-7 degrees is all you normally need as a beginner or for sport flying. With my 50-50-40 swashmix above I was getting about 9 degrees.
Now if you have a high amount of swashplate travel and use expo to tame things down around centre stick it works well until you (as a beginner) get into trouble and over compensate your stick movements and all of a sudden those 12 degrees in the opposite direction kick in very quickly because of that expo (travel is the same but the rate it's applied proportional to stick movement is different) and the heli piles sideways in to the ground. I speak from bitter experience here
So what’s the solution? Dual Rate. I found lots of sites mention DR but without much explanation as to how it works, except it reduces the amount of servo throw/travel but without relating it numerically to cyclic pitch. If you consider the 9 degrees of swashplate tilt I got with my 50-50-40 swashmix and then think of the maximum cyclic pitch you’d need for basic flying, probably about 6 degrees, you can see that if you set your dual rates to 66% that would limit the maximum amount of cyclic pitch to 6 degrees (6 being 66% of 9)
After you set DR you can add expo if you wish – I set my dual rates to 70% with 10% expo on Aileron and Elevator and 65% with no expo for the Rudder which is nice and stable and smooth for me but your preferences may vary!
Hopefully that will result in a nice stable, tame 250 for you!
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