Home Forums Main Forum SebArt Wind S 50E ARF

Viewing 15 posts - 31 through 45 (of 49 total)
  • Author
    Posts
  • #740
    Brookes745
    Moderator

    Next job to do was a check of the CG of the model and as I expected, she is tail heavy. Even with the 6S Lipo as far forward as it would go, further forward even than the battery tray, it would still require nose weight. So what can I do about it? There are some options:

    • Rudder servo is mounted at the rear but there is a slot for it to be mounted in the normal place under the canopy area, so move it.
    • Reinforce landing gear area as mentioned before to add strength and weight.
    • Run a separate battery for the avionics, adds weight and redundancy.

    Hopefully that will bring the CG into limits. Gratuitous outside shot taken during the CG check….

    • This reply was modified 10 months, 1 week ago by Brookes745.
    #744
    Brookes745
    Moderator

    So the first part of operation “move the CG” is to move the rudder servo forward from the tail into the pre-cut slot on the fuselage and to convert to closed lop control. Interestingly all the hardware to do this is included with the kit. Rudder servo in its new home…..note the fuel tubing keepers that will be pushed into place when everything is finally adjusted.

    #745
    Brookes745
    Moderator

    Next a second arm was added to the rudder and the closed loop system connected up.

    #746
    Brookes745
    Moderator

    Another shot of the linkage……

    #750
    Brookes745
    Moderator

    Next up was to strengthen the landing gear to add a bit more weight forward of the CG. Ply doublers were added to the balsa faring’s and 2mm glass fibre board reinforcing plates made up to glue directly to landing struts.

    #751
    Brookes745
    Moderator

    Then masked and sprayed blue….

    #752
    Brookes745
    Moderator

    And finally fitted using epoxy……

    #753
    Brookes745
    Moderator

    Next step was to do another balance check with the LiFe receiver battery and flight battery in place. results showed that had sufficient room to mount the LiFe to achieve correct balance. Did it cheekily in the front room while wifey was at work as it was raining outside…….model shown here fully assembled on my stand waiting to go on the balance rig.

    #754
    Brookes745
    Moderator

    Battery shown in position below motor mount…it will be under the cowl but being a LiFe I’ve no worries about charging it in situ….

    #755
    Brookes745
    Moderator

    The receiver was mounted in place. To leave the flight battery bay as clear as possible I made a removable platform above the rudder servo. Note the two satellites lit up as well as the receiver and one of the two aerials pointing upward in  a tube….

    #756
    Brookes745
    Moderator

    A separate switch was mounted to connect the receiver battery. The lead from the ESC had the red power connector de-pinned so power will only come from the receiver battery……

    #757
    Brookes745
    Moderator

    Sticky velcro added to the battery and the bay floor to hold the flight battery firmly in place along with velcro straps…..

    #758
    Brookes745
    Moderator

    Next up was to fine tune the controls. The best way to do this and make sure that everything is bob on, is to do it off the aircraft, on a jig.

    #759
    Brookes745
    Moderator

    Basically the jig involves a piece to wood with holes in it to hold the tail plane or wing halves in place along with the joiner tube. The neutral points can then be accurately measured and adjusted.

    #760
    Brookes745
    Moderator

    Same process with the ailerons. Both surfaces are set to 40 degrees of movement full deflection but for normal flight they are set to 30% on the rates. This gives a deflection of about 15mm at the TE. 100% is only used for spinning and all the rates for all the surfaces are controlled off one switch.

    • This reply was modified 10 months ago by Brookes745.
    • This reply was modified 10 months ago by Brookes745.
Viewing 15 posts - 31 through 45 (of 49 total)
  • You must be logged in to reply to this topic.