Prather Commander / twin TFL P1 drives

[cmoo]

Super clean. I'm currently building a 46 Prather commander II. surface drive thoughimage.jpg
A pic from yesterday

[Tails Up]

I have a couple questions about your Apache. Is that gear driven where the drive shaft splits into two? And what are the two tanks in the pic? The small one at the upper left and the large aluminum one on the right. Sorry if they seem like dumb questions,I am new to the electric scene. You have some sweet boats,BTW. Joe

[FlogginHarvey]

cmoo - that is awesome!!! Start a build thread on it!!! Love to trade notes! Where are you planning CG?

I bought some 3S packs tonight & WOW what a difference in weight to the 2S packs I tested. Batts are easily 1 1/2 - 2" forward of yesterday at right on 30%!!!

Tails Up - yes it is. That Apache is a REALLY FUN rough water boat!!! MHZ "splitter gear box" to go from a single input to a COUNTER ROTATING twin output. It is overdriven as well as the MHZ drives. The overdrive increases rpm's but causes some torque loss along with all the drive train. It was kind of a pain to find props and I am really close. In very rough water it hauls the mail. In calm it putts around. I need to go slightly smaller or do a Barr Cut to them and I think I'll be there.

The tanks: the small one aft is for the gear box. It gets pretty warm when running any length of time and liquid expands... The front round one is the fuel tank. I'm a gas guy primarily...my wife tells me ten boats is too many. It's probably two boats too many.. One of the Dumas Scarab KV's needs to go for sure...and I stumbled into an SV43 last winter that needs rigged so I should probably sell the Apache.

[FlogginHarvey]

Here is an FE dumb question: how does everyone setup on/off switch? Can a single one be run well for the two esc setup???

[FlogginHarvey]

Had a little "tinker time" in the garage tonight and was able to make some headway. Confirmed placement on everything for a 30% CG with the 3S batteries and epoxied all but the steering servos. Located and drilled the holes for the steering rods and epoxied in some 3/8" k&s tubing. I hope it works out okay clearance-wise. I've used this ona couple of gas boats and it works great. From what I played around with it looks like it will be fine and the bellows will not be an issue hanging up on the motor mounts. I need to get some threaded rod to mock it up tomorrow. Here are some pics:

[daveives]

It is dangerous to have each drive move independently because if the servos get wet they can move the drives props together, which chops both up. Please do not ask me how I know! Perhaps a sliding connection between the out drives to preclude mashing together is called for.

[FlogginHarvey]

I hear ya and thanks for the reminder. If you look closely at the Apache I am planning to do a tie rod similar just not 100% sure how I want to do it yet. I stumbled on a Youtube video of a bench test with a pair of the same drives on a 30"ish mono and a couple a pretty impressive running videos. He had a tie bar and I thing he mounted them on the top hole of the gear cover. I just need to confirm the size of that button head screw so I can buy some longer ones and get it test fit...the list grows!

[cmoo]

cmoo - that is awesome!!! Start a build thread on it!!! Love to trade notes! Where are you planning CG?

I bought some 3S packs tonight & WOW what a difference in weight to the 2S packs I tested. Batts are easily 1 1/2 - 2" forward of yesterday at right on 30%!!!

Tails Up - yes it is. That Apache is a REALLY FUN rough water boat!!! MHZ "splitter gear box" to go from a single input to a COUNTER ROTATING twin output. It is overdriven as well as the MHZ drives. The overdrive increases rpm's but causes some torque loss along with all the drive train. It was kind of a pain to find props and I am really close. In very rough water it hauls the mail. In calm it putts around. I need to go slightly smaller or do a Barr Cut to them and I think I'll be there.

The tanks: the small one aft is for the gear box. It gets pretty warm when running any length of time and liquid expands... The front round one is the fuel tank. I'm a gas guy primarily...my wife tells me ten boats is too many. It's probably two boats too many.. One of the Dumas Scarab KV's needs to go for sure...and I stumbled into an SV43 last winter that needs rigged so I should probably sell the Apache.

I do have a build thread on it. Check it out under my profile. Have tons of pics.

[FlogginHarvey]

I found it - fun project!!! You're almost there!

[Brushless55]

Really looking forward to seeing how well this big boat runs with this setup !

[cmoo]

image.jpg
Just finished my Prather. Getting it out on the water today. I'll let you know how it runs, stoked to see this big hull go

[FlogginHarvey]

Thanks brushless55 - I am too!!! My daughter and I have high hopes!

Sweet cmoo! Can't wait to see how it turned out!!!

[axel]

how is the progress?

[FlogginHarvey]

Hey axel. Been slow this summer because of work travels. No updates yet

[axel]

Thanks for the info

place the lipo not side by side instead behind each other so you drop the gravitycenter a bit.

have you seen this thread?
http://forums.offshoreelectrics.com/...ive-on-CF-mono

so you see how it runs on 4S