Announcement

Collapse
No announcement yet.

Predator III for the slope

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Predator III for the slope

    Not so scale, but very neat stuff. I've been so happy flying my RCRCM Strega during the last two trips to Cumberland/Highpoint that I decided a stable mate was in order. So, I've added a PIII to the mix.

    My gorgeous Strega after a long fun flight at Highpoint...
    Click image for larger version  Name:	 Views:	0 Size:	221.4 KB ID:	41969

    I was able to custom order the PIII with a clashing color scheme, orange and black on top, black and yellow on the bottom. No worries about telling which side is up! (From order to delivery was 4 weeks and w/ EMS I was able to track it from the shop, across China to the airport in Beijing, and here to my door.)

    3 meter span is a good size and at first glance this plane appears quite similar to the Strega, but has a different wing shape, a small bit more area, bigger flaps that extend all the way to the fuselage side, less of an angle in the center joiner and slight up turn in the outer section for very minor dihedral. The Strega is essentially an elliptical straight wing with some center dihedral only. The fuselage and tails are near identical between the two.

    Click image for larger version  Name:	 Views:	0 Size:	116.0 KB ID:	41970

    Click image for larger version  Name:	 Views:	0 Size:	117.8 KB ID:	41971

    I just started this afternoon and this will be a quicker build than the Strega simply because I have one under my belt. The servo drives are the fussy part, all else is pretty standard stuff. For this air frame, I went with the new KST X10 wing servos sourced from AMain Hobbies as both KST and MKS fit the supplied frames -- X10 = 104.16 oz-in @6v | 131.93 oz-in @7.4v | 149.98 oz-in @8.4v

    Click image for larger version  Name:	 Views:	0 Size:	86.2 KB ID:	41972

    And... a bit more motor in this one via a 35mm 920 KV Leopard outrunner sourced from Altitude Hobbies. Power will be 4S 1800 mAh turning a carbon 13x7 just like the 780 KV Strega. It's really just to get the plane out over the slope.

    Click image for larger version  Name:	 Views:	0 Size:	110.1 KB ID:	41973

    Its purdy...

    Click image for larger version  Name:	 Views:	0 Size:	53.1 KB ID:	41975 Click image for larger version  Name:	 Views:	0 Size:	43.9 KB ID:	41974
    Last edited by Steve P; 08-01-2020, 10:58 PM.
    Team PowerBox Systems Americas... If flying were the language of men, soaring would be its poetry.

  • #2
    Put in some time today getting all six servos in place, setting up the v-tails and making up the wiring harness. All take time but overall not too exciting. I’m waiting on an order that includes the receiver for this bird.

    I do prefer to “pot” the servo frames by cutting squares of plastic grocery bags, putting that over the frame and then bolting the servo into the frame. A healthy dose of epoxy thickened with colloidal silica on the frame and wing skin and then weigh it down. The epoxy tends to work into the narrow spaces in the frame and between it and the servo. When all cures, remove the servo and peel away the bag. Results in a super tight fit.

    Click image for larger version

Name:	
Views:	0
Size:	104.4 KB
ID:	41997
    Team PowerBox Systems Americas... If flying were the language of men, soaring would be its poetry.

    Comment


    • #3
      Another maiden flight success from the past weekend.

      Predator III had its shake down on Sunday. Definately had too aggressive elevator throws and it needed a half ounce of lead right behind the motor (not a worry as this is for the slope). Performed beautifully, caught a nice thermal in the flight after throws were tamed and the CG brought a touch forward. Still on that ragged edge of too far back that makes for good thermal indication and inverted on the slope. Lands slow and beautifully. I'm really impressed by the new KST X10 thin wing servos. Very tight and strong.

      Flew it on my PowerBox CORE + PBR-8E receiver. Lots of good mixes for snap flaps; flight modes of camber, reflex, cruise; option to mix aileron to rudder if I want to thermal lazy; and, landing mode variable flap to elevator compensation. Motor on the left slider, flaps on the left stick.

      Probably won't see too much action outside the Cumberland events, but the fact it would thermal quite well was an unexpected surprise that may see it making the trip to the local field more often.

      Happiness.

      Click image for larger version  Name:	 Views:	0 Size:	340.6 KB ID:	42122
      Click image for larger version  Name:	 Views:	0 Size:	269.1 KB ID:	42123

      Click image for larger version  Name:	 Views:	0 Size:	190.5 KB ID:	42124
      Last edited by Steve P; 08-10-2020, 09:24 PM.
      Team PowerBox Systems Americas... If flying were the language of men, soaring would be its poetry.

      Comment

      Working...
      X