Whiplash Sport 20 Build

[detox]

Finally got servo (lightweight Futaba s3004), 21 rudder, 40 strut, stuffing tube (with .187 teflon liner) installed. I went ahead and installed my rudder on the right side. Linkage is short 440 so deflection will not be a problem. Water pickup will be opened for better pickup. Rudder will also be shortened a little.

[detox]

I cut 1" off of the Speedmaster 21 rudder. I also sharpened 21 rudder on one side and opened water pickup slightly.
Speedmaster mini rudder on left Speedmaster 21 on right.

[detox]

Almost complete. Footprint is same size as Whiplash 40, but a little lighter in weight (10 lbs).

I will try a few motor combinations just to say "been there done that".

Q Sport Hydro 6s: 1527 1y (1250kv), 1521 1y (1577kv)

P Sport Hydro 4s: 1521 1.5d (1860kv), 1518 1.5d (2300kv), 1527 .5y (2500kv)

My next build will be the Whiplash 40

[oscarel]

I like the carbon ride pads! I just weighed my 40 and it's at 12.2 with TP 6s 6500. I was going to get you some numbers this evening but storms are in the area. I'll try first thing in the morning.

[detox]

Thanks Oscar. I know the picture looks a little confusing (upside down). The radepads are about 1/32" thick with sharp back trailing edge. I will aslo scuff bottom serfaces.

[oscarel]

Yeah, I had to take a couple looks and then saw the stuffing tube. You know, I have a 1521 1Y as well, may have to give that a try.

[detox]

My Futaba receiver has antenna wire, so i installed antenna. Mount is made from 5/32" brass tubing epoxied to inside of hull (epoxy thickened with micro balloons) . Small diameter silicone fuel line will seal and hold plastic antenna tube in place. Ain't it wonderful what you can learn just by glancing at someone elses build.