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JDA
Joined: 27 Sep 2021
Posts: 6
Location: Wiltshire UK
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 Posted: Tue Jul 04, 2023 11:42 am Post subject: Flap rigging adjustment rqd |
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Does anyone have any advice on adjusting the flap rigging once the initial build has been completed? My monowheel has slightly more flap (about 1deg) on the RHS. The upshot is that it rolls left - even with a passenger on board. I have to carry a bit of aileron to compensate which is easily trimmed out, but because of this the aircraft always drops a left wing in the stall - and sometimes quite dramatically! If I stall with the stick in the middle and keep the wings level with rudder I can sit in the heavy buffet without wing drop. Because of the benign stick-central stall I am reluctant to use stall strips, although this remains a last-ditch solution. I would rather fix the problem at source and level up the flaps - it is only a tiny amount. The Europa Club archives has some notes by Bud Yerly: he advocates trimming the flaps by shimming the flap drive tube against the baggage bulkhead to "twist" the tube. However having spent a day with a torch and a lot of head scratching I cannot work out exactly how this would work in practice - and in any case there is no bulkhead for me to easily shim against. It seems to me that it would be a far easier solution to shim one of the flap drive tube brackets (FL18) on the floor of the fuselage to raise one side of the tube - if only they weren't bonded in place! My proposed solution therefore is to obtain a replacement torque tube hinge arm FL16 (undrilled) from Europa, and re-drill the holes to effectively shorten the arm and drop the flap on one side by one degree. This would cause a little twisting, but the whole flap assembly across the span appears flexible with a little play - and we are only talking about 1 deg as measured at the flap which is a tiny amount.
My questions are: has anyone successfully adjusted their flap rigging before? How was it done? Has anyone used Bud's solution who can explain how it works in practice? Can anyone think of a technical objection to my own proposal above?
To answer the obvious question: I am in the UK and subject to the LAA. My inspector would be involved and I am already sharing my thoughts with him, but neither of us wants to re-invent the wheel if it has been done before!
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Area-51
Joined: 03 May 2021
Posts: 391
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| Posted: Wed Jul 05, 2023 12:23 am Post subject: Re: Flap rigging adjustment rqd |
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What about a concentric in the flap tube where it meets the flap pin?
1 degree = 2.98mm radial travel of the flap pin.
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wdaniell.longport(at)gmai
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| Posted: Wed Jul 05, 2023 6:02 am Post subject: Flap rigging adjustment rqd |
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The way that bud suggests is to use the front end of the flap slot in the rear fuselage and the baggage bay bulkhead - build up the required shim with flox. bud's suggestion worked for me ...but I have a tri not a mono
William Daniell
LONGPORT
+1 786 878 0246
On Tue, Jul 4, 2023 at 3:44 PM JDA <johndavidamos(at)gmail.com (johndavidamos(at)gmail.com)> wrote:
| Quote: | --> Europa-List message posted by: "JDA" <johndavidamos(at)gmail.com (johndavidamos(at)gmail.com)>
Does anyone have any advice on adjusting the flap rigging once the initial build has been completed? My monowheel has slightly more flap (about 1deg) on the RHS. The upshot is that it rolls left - even with a passenger on board. I have to carry a bit of aileron to compensate which is easily trimmed out, but because of this the aircraft always drops a left wing in the stall - and sometimes quite dramatically! If I stall with the stick in the middle and keep the wings level with rudder I can sit in the heavy buffet without wing drop. Because of the benign stick-central stall I am reluctant to use stall strips, although this remains a last-ditch solution. I would rather fix the problem at source and level up the flaps - it is only a tiny amount. The Europa Club archives has some notes by Bud Yerly: he advocates trimming the flaps by shimming the flap drive tube against the baggage bulkhead to "twist" the tube. However having spent a day with a torch and a lot of head scratching!
I cannot work out exactly how this would work in practice - and in any case there is no bulkhead for me to easily shim against. It seems to me that it would be a far easier solution to shim one of the flap drive tube brackets (FL18) on the floor of the fuselage to raise one side of the tube - if only they weren't bonded in place! My proposed solution therefore is to obtain a replacement torque tube hinge arm FL16 (undrilled) from Europa, and re-drill the holes to effectively shorten the arm and drop the flap on one side by one degree. This would cause a little twisting, but the whole flap assembly across the span appears flexible with a little play - and we are only talking about 1 deg as measured at the flap which is a tiny amount.
My questions are: has anyone successfully adjusted their flap rigging before? How was it done? Has anyone used Bud's solution who can explain how it works in practice? Can anyone think of a technical objection to my own proposal above?
To answer the obvious question: I am in the UK and subject to the LAA. My inspector would be involved and I am already sharing my thoughts with him, but neither of us wants to re-invent the wheel if it has been done before!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511036#511036
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