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Futaba 18 MZ

Old 11-10-2021, 11:09 PM
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Default Futaba 18 MZ

Hi all ,

Can anyone explain the best way to set up Aileron Differential.........on the 18MZ
How do I set it for the different conditions ??

many thanks
Old 11-11-2021, 02:23 AM
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Malcolm H
 
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Use Ail Differential in the Model Menu. Page 112 of the manual explains. Generally I have found that aileron differential needs to be constant across all flight conditions so set switch at top left of differential screen to Gr so that settings remain the same when you change flight conditions. Assuming a two aileron wing set up with Ail and Ail2 you will be presented with 4 boxes, Ail Left, Ail Right, Ail2 Left and Ail 2 Right. These all default to 100%. For a conventionally hinged (not top hinged) wing you are going to want to set more up travel than down. You will be adjusting two of them down from 100% so that down travel is less than up travel. The boxes you will be adjusting will either be top left and bottom right or vice versa. To determine which ones to reduce arbitrarily reduce one pair a chunk so that you can see the effect. If the down going ailerons reduce great, if not put those back to 100% and reduce the other pair. Once you discover which pair to adjust set an initial reduction of 5% so set these to to 95% with the other pair left at 100%.

Now you are ready to tune the differential in flight. There are a number of ways to do this, one being to fly into wind, lift the nose of the plane to approx. 45 degrees and then hold only aileron full over. Watch as the plane rolls consecutively, if rolling right and the plane walks left, increase differential in that direction. If rolling right and plane walks right, reduce differential. Repeat for left rolling. Another way to set differential is to pull to 45 degrees, half roll and pull through a reversal. Watch carefully the heading of the model as it pulls through the half loop. If it is heading left after a right roll, increase differential, if its heading right, reduce it.

Whatever method you use, it needs to be repeated several times and in several wind conditions. Getting it correct is a very subtle adjsutment.

Hope this helps,

Malcolm
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wattsup (11-14-2021)
Old 11-11-2021, 08:05 PM
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Originally Posted by Malcolm H View Post
Use Ail Differential in the Model Menu. Page 112 of the manual explains. Generally I have found that aileron differential needs to be constant across all flight conditions so set switch at top left of differential screen to Gr so that settings remain the same when you change flight conditions. Assuming a two aileron wing set up with Ail and Ail2 you will be presented with 4 boxes, Ail Left, Ail Right, Ail2 Left and Ail 2 Right. These all default to 100%. For a conventionally hinged (not top hinged) wing you are going to want to set more up travel than down. You will be adjusting two of them down from 100% so that down travel is less than up travel. The boxes you will be adjusting will either be top left and bottom right or vice versa. To determine which ones to reduce arbitrarily reduce one pair a chunk so that you can see the effect. If the down going ailerons reduce great, if not put those back to 100% and reduce the other pair. Once you discover which pair to adjust set an initial reduction of 5% so set these to to 95% with the other pair left at 100%.

Now you are ready to tune the differential in flight. There are a number of ways to do this, one being to fly into wind, lift the nose of the plane to approx. 45 degrees and then hold only aileron full over. Watch as the plane rolls consecutively, if rolling right and the plane walks left, increase differential in that direction. If rolling right and plane walks right, reduce differential. Repeat for left rolling. Another way to set differential is to pull to 45 degrees, half roll and pull through a reversal. Watch carefully the heading of the model as it pulls through the half loop. If it is heading left after a right roll, increase differential, if its heading right, reduce it.

Whatever method you use, it needs to be repeated several times and in several wind conditions. Getting it correct is a very subtle adjsutment.

Hope this helps,

Malcolm
This is great Malcolm thanks ,

With AILERON 1 and AILERON 2 set up how do I get the angular displacement of each side to match??

many thanks

Old 11-11-2021, 11:56 PM
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You need to use a digital angle meter like eFlight AnglePro ll or Wixey digital angle meter. The Wixey has a large enough base to be attached to the surface with small pieces of double sided tape (reduce the stickiness by rubbing it first so you don’t pull your paint off). The AnglePro needs a mount to hold it steady. CK Aero sell a suitable mount.

Which ever meter you use, always place it the same way round on each surface to increase accuracy.

Malcolm
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wattsup (11-14-2021)
Old 11-12-2021, 03:45 PM
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Originally Posted by Malcolm H View Post
You need to use a digital angle meter like eFlight AnglePro ll or Wixey digital angle meter. The Wixey has a large enough base to be attached to the surface with small pieces of double sided tape (reduce the stickiness by rubbing it first so you donít pull your paint off). The AnglePro needs a mount to hold it steady. CK Aero sell a suitable mount.

Which ever meter you use, always place it the same way round on each surface to increase accuracy.

Malcolm
Yes I got that but how do you adjust the throws using the radio when you have AIL1 and AIL2 mode selected ??
Old 11-12-2021, 09:43 PM
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When you set up a two aileron wing type you will find Ail and Ail2 in the ATV program under the Linkage menu.

With the differential program boxes all set to 100% you can use the ATV function for each aileron to get equal throws up and down before you adjust the differential.

However, it is important to be meticulous with your mechanical setup first. This means ensuring that all control surface horn and servo output arm lengths are identica. Also that pushrods come off output arms and onto control horns at exactly 90 degrees. If you don’t do this the surfaces might be set to the same travel at full throw but might vary throughout their travel. There is no easy way to correct this in the 18MZ and good mechanical geometry is preferable anyway.

Once you get this correct you can adjust the differential as previously described.

Malcolm
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wattsup (11-14-2021)
Old 11-12-2021, 10:16 PM
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Originally Posted by Malcolm H View Post
When you set up a two aileron wing type you will find Ail and Ail2 in the ATV program under the Linkage menu.

With the differential program boxes all set to 100% you can use the ATV function for each aileron to get equal throws up and down before you adjust the differential.

However, it is important to be meticulous with your mechanical setup first. This means ensuring that all control surface horn and servo output arm lengths are identica. Also that pushrods come off output arms and onto control horns at exactly 90 degrees. If you donít do this the surfaces might be set to the same travel at full throw but might vary throughout their travel. There is no easy way to correct this in the 18MZ and good mechanical geometry is preferable anyway.

Once you get this correct you can adjust the differential as previously described.

Malcolm
Thanks Malcolm that's all good now......

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