BlackJack 29 Twin Cat Custom Build

[bigbluechevy454]

Are u one of the guys that run lake ella on sundays?

[lakeella]

Are u one of the guys that run lake ella on sundays?

Yes this is Travis

[bigbluechevy454]

Your the guy from the hobbie store that invited me to lake ella

[lakeella]

yes, that was me. You should come by and check it out. We're there on sundays

[bigbluechevy454]

Sounds good man id like to get a r/c boat. R/c boat with twin outboards

[lakeella]

Sounds good man id like to get a r/c boat. R/c boat with twin outboards

We can do that. I just built an OPC Tunnel that I will be testing out Sunday. Come by and check it out. What type of hull do you want Deep Vee, Cat?

[pyro]

I'm planning on getting one of these for this season. Looks like a nice setup.

Nicd craftsmanship on your twin setup.

[lakeella]

I'm planning on getting one of these for this season. Looks like a nice setup.

Nicd craftsmanship on your twin setup.

I'll be posting this one for sale once I finish it. I'm a builder not a racer. I only run my boats enough to work out any bugs and test for the best prop and misc setup adjustments.

[pyro]

Awesome build.

What have you found to be the best center of gravity point for this hull in stock configuration? I only have 2S lipo's. I noticed that I can add a third pack up front for 6S and still achieve the same COG if I move the side packs backward an inch of two. Does this sound like a good idea?

I was going to start out with the COG at the motor mount plate, around 19" back from the tips of the bow. Is this a good starting point?

[lakeella]

Awesome build.

What have you found to be the best center of gravity point for this hull in stock configuration? I only have 2S lipo's. I noticed that I can add a third pack up front for 6S and still achieve the same COG if I move the side packs backward an inch of two. Does this sound like a good idea?

I was going to start out with the COG at the motor mount plate, around 19" back from the tips of the bow. Is this a good starting point?

Your center of gravity should be between 25-33% from the transom of the sponsons. If you plan to run 6S you need to run two 3S batteries in series, change out the connectors on the batteries, ESC and motor to 5.5mm gold bullet plugs and get a sharpened and balanced 42mm-45mm prop. Other wise you will burn up the ESC/Motor. I've seen it happen too many times. the stock deans plugs and the stock 4mm bullets will get so hot that the wires will melt out of the ESC,and/or the shrink wrap will melt and short everything out. It doesn't cost much to do these upgrades. The connectors are $1.50 each you need 6 each. The S&B prop will cost about $35-$40. I have a wide variety of S&B props. Feel free to contact me if you have any questions

Travis

[pyro]

Thanks for the tips.

I use 50c 2s hardpack lipos in my Slash, so I soldered banana connectors directly to the ESC leads with 90° bend at the joint ends for clearance, with a separate banana series jumper.

If I understand correctly, "33% COG" as you suggested means that the ideal COG is 33% of the sponson's length between the aft running surface and the bow? (near the motor mount plate) Correct?
It appears that this ideal COG value can still be achieved with two packs pushed back a bit and a third 2s pack sideways in front of the motor for 6s power.

A few people have recommended upgrading to an Octura X642 for 4s running. Any thoughts?

I already began to blueprint and sharpen a spare stock prop. I ordered a balancer yesterday to finish the job. I took what I know about 1:1 cleaver prop design and applied to this prop in scale. The nick in the leading edge is probably due to a casting flaw, as my bone-stock prop has the same nick in the same place.

This prop is presently 8 grams, but it's still a work in progress.