I can certainly vouch for the lower canoe having some inherent twist in
it. However, one has to live with in as it is not noticeable when
aircraft complete according to Graham S. It doesn't upset the flying
characteristics of the aircraft. Better to allow the canoe to hold the
inherent twist as it is set rather than try and take it out and put the
airframe into permanent opposite stress.
Cheers,
Tim
Paul Stewart wrote:
> Steve There are two reasons for the apparent different angle of
> attack. Firstly the lower canoe has some inherent twist in it.
> Secondly the port and starboard fuselage mouldings are not symetrical.
> As a result the tail planes look as though you,ve made a complete
> b***s up of them. It certainly seems to be quite a common finding -
> indeed there was quite a bit of correspondance about it a while
> back. Regards Paul Stewart #432
>
> ----- Original Mes sage -----
> From: Steve Hagar
> Subject: Tailplane to root fairing alignment,
> -and servo pins
> I have started jumping around on doing mechanical assembly
> of the fuselage components/systems. It seems whenever I get
> into something one little item keep me from completion so
> rather than wait for a part or information I go to another
> part. This week I find myself at the tail end. Upon
> installing the tailplanes it appears that the angle of
> attack of one is greater than the other. This appearance
> stemming from the alignment of each tailplane root with the
> fairing moulding of the fuselage. The port side angle of
> attack looks greater when compared with the moulding on the
> fuselage. This is especially disconcerting since I had
> spent days many months (years?) ago lining the left and
> right sides up when constructing the tailplane
> assemblies. However upon jigging up my digital level and
> measuring the aoa of each tailplane to the best of my
> ability, I find that I am within 0.1 degree between left
> and right. My assumption is that the molding is off slightly
> and I may have a small shape variance between the leading
> edge profiles near the molding giving the appearance of
> highly differing angles of attack. Has any one else seen
> this on their fuselage moulding? It is disconcerting but I
> am not planning on changing anything as the level doesn't
> read to better than 0.1 so I am within the capability of my
> tools. Any thoughts out there on this? A second item: I find
> that my left and right servo tabs are not lining up (no not
> in the same direction as the apparent difference of the
> tailplanes noted above!). Though however this is a good
> thing as the drive pins need to come out to implement the
> installation of the beefier units that I almost had to beg
> Europa to send me. Do any of you who have performed the
> retrofit have any tips or shortcuts for the swap out to to
> enhance alignment. I plan on trying to use the T bar to
> reset these. Any tips on ripping the old units out to
> preserve the planar alignment of the pin plate? Steve
> HagarA143Mesa, AZ(finally some good building weather, I can
> now leave the garage door open) --- Steve Hagar---
> hagargs@earthlink.net
>
--
Timothy P Ward
12 Waiwetu Street,
Fendalton,
Christchurch,
NEW ZEALAND
Ph. 0064 03 3515166
email ward.t@xtra.co.nz
Mobile 025 2649325
|