Whiplash Sport 40 Build

[detox]

Here are a couple pics showing battery compartment. This hull will easily hold two Hyperion 6s 3300mah packs (6s2p 6600mah). Or two Neu 3s 8300mah packs (6s1p 8300mah). For 8s sport running you could use two 4s 5000mah packs (8s1p 5000mah)

[detox]

Hull weighs 9.8 lbs as shown in picture. Balance point is 1.75" behind rear edge of sponsons. First I will try the NEU 1521 1y (1577kv). Then the larger 1527 1y (1250kv)

[detox]

I am using the Speedmaster 40 hydro rudder and Speedmaster long flat bottom strut ( rounded off left bottom edge) with extended mono strut bracket. Servo is a basic Futaba 3004.

[Shooter]

Looks great. I like the the easy in/out servo mount. I noticed that some folks running the longer motors support the back end, and some do not. Do you have any reasons/experience as to why you went without? I'm going to start building a railmount soon, and was looking for some direction. Thanks.

[detox]

It would probably be good insurance to use extra motor support. I may make one up.

[oscarel]

I like the color!! Lets see the cowl. I like the servo mount as well. I'm going to have to do something different, mine sticks up too high.

[detox]

I purchased some Oracal 651 Black sign vinyl and cut out my windshield. Any place that makes signs has this stuff. I paid $5.00 for 12" by 24" piece. This requires some trial and error, but easier than painting. I made a photo copy of ACTUAL SIZE templete (save picture then print).

I do not like this shade of Yellow, but atleast it is glossy and hull is sealed. I wish I had painted hull light Blue metalic.

[detox]

Lipos are charging (I shortened battery wires). Final RTR hull weight 10lbs 2ozs. The chain reaction begins.

[detox]

Back from the pond. Using the x452 boat was fast. Accordind to Castle Data logger max amps pulled 200 (averaged about 130). Some say I could use up to a x457 without problem. I will try to get full 7 lap video this weekend. I am using the cheap Tactic radio/receiver.

Virginia Craftsman turnfin

[oscarel]

You did an excellent job! They are sweet. Here's a couple graphs from eagletree, x457 and 1955.

Screen shot 2012-10-18 at 9.43.25 PM.jpgScreen shot 2012-10-18 at 9.47.03 PM.jpg

[detox]

Those graphs a very helpful. I did view my graph from the Castle ICE, but I deleted it. I will try to post a good graph later.

[jcald2000]

0 to 62mph in 2.5 seconds, need to get it on a drag strip!! LOL

[detox]

My pond has some weeds so run time is very limited. Most everytime I brought the hull in it had weeds hanging from the rudder. I did learn one very important thing, my hull does not like strut depth deeper than 7/8"using the x452. Sponsons would run too wet if strut was set deeper than 7/8". Next I will experiment with sponson ride pads (sanding, squaring back edges, raising 1/16"- 1/8"). Hull is very stable in turns and straits. More testing before video.

[detox]

Hull was running a little too wet so I added stepped ride pads. I cut these from a board of hard maple. This raised ride height 3/32" and increased AOA 1 degree. I sealed bare areas with fast epoxy. Thin coat of urethane paint will be applied (no primer) to keep edges sharp.

After painting I will roughen up hull floor with 400 sandpaper. This will reduce water drag also.

[detox]

Today i built a setup board. This one has four legs. Next one i build will be larger and have three legs. Currently strut is set flat on board and 11/16" high. Strut angle is set using feeler gauge between strut bottom and board surface. I scribed line on side of turnfin for easy angle adjustment against board.

Dasboata prepaired a nicely thinned and slightly detunged x455 for me. Boat is very fast and stable ... capable for more speed.