Newbie Building a fast electric and needing help.

[mscrampton]

Opps!! Just realized the error in my order. Don't want a center mount rudder I will need an off set correct?? Any suggestions??

[Rumdog]

yup. offset. I wouldn't run teflon with a .250" flex.

[mscrampton]

Okay!! Why not??

Hey Rum Dog! Addict you must be I've been trolling other info sources and you just seem to popup everywhere. So why not the teflon. I thought it was suppposed to line the inside of the 11/32" brass tube.

[Old Sloppy]

If you want equal turning abilities, use a center mount rudder, not an offset rudder.

If you are racing on an oval course or SAW ,then use offset rudder.

on my 50" apache my rudder is a speedMaster with 6" setback, so I can remove the prop and cable for cleaning & greasing.

an 820 Kv motor on 12s will spin 40,000 rpm's. Somehow I think you do not want that.

I run my 813 Kv motor on 9s, read my sig please.

a x457 on 11s is 82 mph, somehow I think you do not want that.

the other prop you mentioned has more pitch and the battery has higher voltage. Somehow I think you do not want that.

the 56-110 is a hundred dollars less that the 2028, the 56-110 will push that 55" hull to 50 mph ( or better) Are you that sure you want a 60 mph ( or better) 55" hull ?

Harry

[Rumdog]

An inline rudder won't give you equal turning ability. The prop still spins counter clockwise. That will lend to the boat naturally making right turns better. I'd NEVER go inline. Especially in a mono.

I've never ran Teflon. On any setup. I remember the gas guys talking about how the rougher nature of a .25 cable (larger wires) can cause more friction, and cause the Teflon to wind up around the cable. I've seen pics, but not in person. Teflon just isn't necessary in any boat, really. Just get the proper stuffing tube for a no liner .25" cable and you'll be good to go.

[BHChieftain]

+2

Chief

[mscrampton]

Okay Sloppy,

Seems like your recommending the 56110 and a different prop?? And the batteries to go with it??? I've been trying to use the calculator that OSE providess as well as another offered thru RCuniverse, I guess old age has made me dummer than a fence post. As for the speed thing yeah I want to try and build a 50+ boat (a fool and his money) but not planning on racing (yet??). But we have plenty of water here in Annapolis, MD. By the way I don't know what you mean by reading your "sig".

Rumdog, Thanks!! Understood....anybody need some teflon tubing and brass tubing??

Cheif?? I'm lost ......+2 ???

[iridebikes247]

In the post I made earlier you can click the link they're good packs for the money. You could run a 56110 leopard, proteus, or beast motor. I would pick "the beast," but forget running it on 12s.

[Old Sloppy]

I suggest;
Leopard 620 Kv motor
http://www.offshoreelectrics.com/pro...56x110&cat=148
10s 40c batteries
Octura x452/3 prop
Castle HV 200 ESC
octura couppler for 1/4" shaft
http://www.offshoreelectrics.com/pro...oct-ocfhe8mm25
flexcable - ask for the step down shaft for a 3/16" prop.
http://www.offshoreelectrics.com/pro...?prod=ose-1290
this will produce 24,796 rpm
96.8 amps
3,976 watts in
3,731 watts out
50.5 mph
3.10 minutes run time (order 2 batteries)
http://www.hobbyking.com/hobbyking/s...arehouse_.html
10s2p will give double run time (6.2 ) (order 4 batteries for extended run time, optional-not required)

Harry

[mscrampton]

For lipos once again...a lot of options. I have run Gens ace packs but will all lower cost packs you won't get the warranty support you get with Hyperion, Maxamps, TP, whatever. Anyway I would run Gens Ace if you have the cash but if not try these out. http://www.hobbypartz.com/77p-sl5000-5s1p-40c-5555.html
People find these packs to be superior to a lot of stuff out there, you're gunna need 4 of them so 10s2p, meaning 10 cells in series, the other 2 packs in parallel.

Okay confused as usual. These are stated as 5s1p batteries so wouldn't it be two these to comprise a total of 10s2p??

[Old Sloppy]

Okay confused as usual. These are stated as 5s1p batteries so wouldn't it be two these to comprise a total of 10s2p??

The answer is NO.

You need four (5s) batteries to make 10s2p.

the 5s means internaly 5 cells shrink wrapped into one pack.

So, 2 of those (5 cell packs) connected "in line" comprise a total of 10s1p.

And 2 10s1p connected "side by side" equals 10s2p.

This is what I ment when I said buying 4 (5cell ) packs will extend your run time.

Harry

[mscrampton]

Dear Ol' Sloppy,

Actually I got that from your last post you simply beat me to the punch on the reply to post enter key :)

Anyway I've also been talking directly with Steve V. and I think this is what I've settled on and probably probably go with one or the other of the packs suggested by you or iridebikes. So here is the list and I'll wait for the comments!!

Thanks to all who have responded to date. I even figured out that I probably don't want to install the auto bailer supplied with the boat. I will try and be deligent in my postings as the build progresses.

Boat Hull- Mountain Hobbies 55” Scorpion (bought)
Leopard 56110 Motor 620kv w/ leo 5675 jacket – (bought)
5692 Motor Mount – (bought)
Swordfish 300 Pro + ESC – 289.99
Hifei High Voltage Capacitor Bank w/8mm Connectors – 19.95
Programmer for Swordfish Esc's – 19.95
USB Program interface adapter – 12.00
Batteries – (4) 5s1p packs -
Charger ??
Stinger – Speedmaster ¼” (bought)
Rudder – Speedmaster Dual pickup Tapered blade w/ 6” setback (bought)
Turn Fins – Carbon Fiber (bought)
Trim Tabs – Speedmaster 1.5x1.5 trim tabs – (bought)
Octura Coupler Flex Hex 8mm to .250 – (bought)
Cable assembly – OSE .250 30” assembly for .250 prop (bought)
Octura brass bullet and drive dog ¼” (bought)
Prop – Octura 467 – 2.64” by 1.4 pitch (bought but will exchange if offered a better option, Prather??)
Gundert 28” Whip Antenna – 11.49
OSE Carbon Fiber Battery Tray – 8.95

Also picked up a prop balancer and a 5/16" stuff getting an estimate on my graphics, and will mark up the mounting points for review. ?? For the moderator, should I change threads to mark the progress of the build with applicable q&a???

[Old Sloppy]

HobbyKing online sells a "paraell charge board".
You can charge all four batteries at once.

I have 2 of them, i charge 3 batteries on each paraell board ( my Cat runs 6 batteries.........9s3p) with 2 chargers running, this speeds up the charge time.

Harry

[mscrampton]

Old Sloppy,

Much Thanks, I seem to be getting the best info from you and it is VERY appreciated. Of my posted shopping list Steve V recommended that I go with the 56110 780kv motor so that is what he has shipped. There were some other minor suggestions and changes made but the potential big impact would be to now change to the step down shaft but I can't seem to get a reply as to the rammifications of making that change now. Other than the cable change 1/4" step down to 3/16 what else?? Do I need to exchange the 1/4 stinger to 3/16?? change the drive dog and bullet and obviously the prop. What are your recommendations?? I have begun to mark up the layout of the drive hardware and will post a few pictures BEFORE I drill any holes. Anyway looking forward to your response.

Much Thanks as Usual,

Mike

[Old Sloppy]

I will use Castle2028 data (I do not have 56-110 data) it is a 780Kv motor.
7s lipo, y557 prop, 134 amps, 21,059 rpm, 3,804 watts = 51.59 mph.
8s lipo and a y557 prop = 5,300 watts and 58.2 mph @ 23,766 rpm and 168 amps.
that is plenty fast for a 55" hull ( not race winning fast ) you will be pleased.
check with steve if the 56-110 will be O.K. with those parameters.
If you use 9s and a x457 prop = 59.2 mph, 6,834 watts, 26,596 rpm, 190 amps, I think that will cook the motor but check with Steve first.your goal is to use the smallest prop that accellerates acceptable, then you can use more cells for more rpm's.
an example of this is a x450/3 prop, 10s, 143.8 amps = 59.7 mph , 30,500 rpm's, 5,791 watts.
for the flexshaft, 1/4" cable uses a 1/4" stinger, the 3/16" step down requires a 3/16" drive dog, prop and 3/16" prop nut (I like Prather brand prop nuts)
the 3/16" flexcable and stinger can work if the prop is no larger than a 2 bladed x557, a x452/3 will snap a 3/16" shaft and you will lose both prop and flex cable and then water will flood into your boat and short out everything.
it has happened to me a few years back. :{
this is why I recomend a 1/4" flexcable with a 3/16" turned down shaft.
install the stinger so that when you set the hull on a table top, the stinger will have a 3mm or 4mm air gap between it and the table top.

Harry