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Archive for July, 2018
Posted by VicT | Jul 24, 2018 @ 11:04 PM | 2,248 Views
Separate flaps instead of flaperons or ailerons are more effective in decreasing touchdown speed and increasing descent rate.

Conscendo Advanced with flaps (0 min 3 sec)

Posted by VicT | Jul 23, 2018 @ 07:11 AM | 1,998 Views
After flying Conscendo Advanced (CA) with the ailerons as flaperons and spoilerons it was time to increase the performance by making flaps. Fortunately the stock 636 receiver has channel 6 operational and can be controlled by a 3 position switch (such as D on the DX 6 and up transmitters). The stock ailerons start at 160 mm from the side of the fuselage and I wanted more flap area so I filled in the hinge cutouts so that the ailerons start at 240 mm from the side of the fuselage. From inflight testing CA still rolls at a respectable rate even with less aileron area. However the increased flap area really slows CA down for low speed touchdowns. A plywood skeg provides protection for the flap ends during touchdown. Torsion springs (.020” O.D.) twisted provide flap return to plywood stops on top of the wing. One servo pulls on each string equally and amp draw is under .4 amps static. A music wire length adjuster and loop is provided so that the wings can be taken apart for storage and transport. 3M 40X tape is wrapped onto the trailing edge of the flap cutout and the whole flap is wrapped with this tape. This provides a good surface for the double sided poster tape that forms three over/under hinges. Tape is then placed over the exposed sticky side of the poster tape. The U shaped hinge is then pushed into the flap end and then twisted once before pushing the other end into the wing. The spring extends close to the aileron servo but does not come in contact.

Pictures to follow
Posted by VicT | Jul 16, 2018 @ 12:32 PM | 2,259 Views
There is a nice 104 gram 95C 850 mah 4S pack that will fit in the CA. Shorter motor runs in the 3-5 second time frame may extend motor off glide time and reduce weight. I plugged in a 90% charged 1500 4S 100C drone pack and after 4 seconds measured 23 Amps and 290 watts. I did another 5 second run with the Aeronautics blades and measured 20 amps and still high watts. Problem is the little. 28.8 mm motor got warmer so it’s either smaller blades or different motor rated for 3-4 cells. Will have to see what others have done. A 35 mm outrunner will fit with a little cowl trimming for cooling air.
Posted by VicT | Jul 13, 2018 @ 08:24 PM | 2,330 Views
Mounted the better Topmodel turbo spinner and Aeronautics 9.5x7 blades and on a Nano Tech 25-50C 1300 3S they pulled 13 A and provided 139 Watts static thrust. RTF with this pack and no underwing stickers is 692 gms/28.349=24.4 oz or 1.525 lbs 139/1.525=91 watts/lb.

This does not seem much but the climbout is not bad. I programmed up elevator so she climbs at 45 degrees in Self Level. With power off this elevator setting gives good speed for gliding. My thermal mode brings both ailerons down about 1/8 inch and up elevator slows her down. She does not thermal like my 10 oz DHLG but is fun anyway.

I set my motor timer for 5 minutes and landed with 30 seconds remaining. The pack had 12 percent remaining and total climb/glide time was 30 minutes. A second similar pack yielded 28 minutes and 31 percent remaining.

A lighter 4 cell pack should work to get faster climbs and lighter weight for thermaling.

I used 100 percent flaperons and 100 percent spoilerons. Self Level in roll axis works either left or right and I could not see a difference. With flaps I did not see the higher angle of descent that my DHLG shows. She slowed down but not as much as I thought. I will compare to the large center spring loaded flaps next. For now the 100 percent spoilererons work better with a higher sink rate. The nose up attitude is different but helps with tail down touchdowns first. Turbo Spinner with the center hold will pick up debris if nosed in...Continue Reading
Posted by VicT | Jul 11, 2018 @ 06:22 PM | 2,878 Views
The BNF Conscendo Advanced should be arriving July 12, 2018. I am preparing the prop upgrade and if you never have done this before this Mini How To will help.

Purpose of upgrade: There are known issues with the stock blade pins slipping away and prop departure. The plastic spinner and plastic blades are OK but there are better parts. The aluminum turbo spinner allows more cooling air to the prop shaft and motor. The aluminum will not change shape during max rpm. Vibration with the aluminum spinner is zero unless you crash and damage the metal or bladesl. The blades have carbon and are rated at 11,000 RPM. The blades fit perfectly in the yoke that I got and the bolts screw in to the aluminum yoke tight and the blades do not get hung up when folding and unfolding. The CZECH Topmodel spinner and parts from Aloft Hobby are excellent and worth the $35 spent.
I always make up a system for parking the blades against the fuselage....either out of one bungee band or with two bands or two springs. Here I have used two small Scrunchee Pony Tail Hair bands. I get a package of colored ones at Walmart. The bands last a few years if there is enough clearance between the firewall and the bands. The bands ensure equal blade unfolding during start up. This reduces imbalance if one prop is hanging vertically down and the top blade is flush with the fuselage. You don’t feel this imbalance in flight but it accumulates and puts stresses on the shaft which transfers them to the motor mount. Pics should explain more:
Posted by VicT | Jul 06, 2018 @ 10:28 PM | 2,138 Views
Bought the battery to get max duration in the Maule. Had to remove most of the wooden floor and some foam from the battery compartment “ceiling” for the pack to fit. Will post amp and watt numbers with a 12/6 APC before maiden. AeroStar 60 amp ESC with ReVerSe.
Posted by VicT | Jul 02, 2018 @ 10:42 AM | 4,463 Views
The Toledo Special has a low drag cowl that allows a 13x 10 prop to fold/park flush with the fuse. This reduces drag and speed / glide performance increases. The Valiant got a prototype cowl out of red cutting board plastic. A 1/64 ply cowl will be made up for fiberglassing.
Posted by VicT | Jul 02, 2018 @ 12:12 AM | 3,512 Views
Same layout and similar power. TS has less frontal drag especially when prop is braked and parked against cowl.

Toledo. Val 10

Wing thickness
35 mm. 37 mm

60.8 oz. 68.9 oz

Wing & spar
27.2 oz. 34.0 oz

88 oz. 102 oz

102/88=1.16% or Val is 16% heavier

Wing area
702.8 sq in. 640 sq in.

88/702/144= 102/640/144=
18.05 oz/sq ft. 22.95 oz/sq ft=. 22.95/18.05=. 1.27 or 27% greater wing loading

640/702.8= 91 % or Val is 9% smaller in wing area

4000 40 C 4S. 4000 60 C 5S
13.6 oz. 17.8 oz