New twin apparition help

[rchuntlsl]

Well I just got my new twin apparition delivered today. This is my first twin. I was wanting a little help from guys that already have them of things to fix right away with it, before they are a problem.

I got two 120amp sped controls for it and I will be running two 3s lipo's in parallel to two feigao 6xl motors. Yes I want this thing to scream. This is what I have on hand to put in it, as this is a budget build. So that is the motor and battery combo that is going in.

Some things I see right away (your opinions would be greatly appreciated)
Rudder is too small, only one water pickup, motor mounts look junky, both flex shafts are wound same direction (i assume when I switch to counter rotating they should turn in).

Should I glass this thing on the inside right away? How durable is this hull?

Any help would be GREAT. I have searched the forums and gotten some information, but it is very spread out. A quick lesson from experience would rock. The school of paying attention is better than the school of hard knocks any day. Thanks in advance, you all rock!!!

[rchuntlsl]

Should I just trash the drive shafts and struts and put in two new super vee ones? The ones on this boat are a little goofy and seem hard to get the shaft out to lube.

[rchuntlsl]

I just took off the stinger style strut off the boat. This two piece drive shaft with the square end looks like something that would fail right away.

Other question. (Twin newbe) With two motors do they pull less amps per motor than the same prop/motor set up in a single? If there are two motors splitting the same load/drag/ect, i would think they would pull less amps. Am I crazy or right? If it is less, how much less????

[Diesel6401]

Dump the 4mm drive it sucks.
You can use a l/r flexcable setup or wiredrives. You can use the stock stringers ( I did), I just changed the bushings out inside the stringers. Their are 2 4mm bushing inside each stringer, I replaced the 2 cheap ones with 1 3/16 bushing per stringer. Takes about 30ms to do. Yes the load is also split between the motors. The stock motor mounts is 19mm, so the 380xl feigao's steve sells will be a direct mount. If you go to a 540 style can it will not directly bolt in. I took a dremal to mine to expand the mount to accept 25mm bolt patterns. You should re-inforce the hull and motor mounts and everything else.

http://s1238.photobucket.com/albums/ff484/Diesel6401/RC%20Boats/?action=view&current=IMG_20110121_140248.jpg&newest=1

http://s1238.photobucket.com/albums/ff484/Diesel6401/RC%20Boats/?action=view&current=IMG_20110121_140248.jpg&newest=1#!oZZ3QQcurrentZZhttp%3A%2F%2Fs1238.photobucket.com%2Falbums%2Fff484%2FDiesel6401%2FRC%2520Boats%2F%3Faction%3Dview%26current%3DIMG_20110121_140258.jpg%26newest%3D1

http://s1238.photobucket.com/albums/ff484/Diesel6401/RC%20Boats/?action=view&current=IMG_20110121_140248.jpg&newest=1#!oZZ6QQcurrentZZhttp%3A%2F%2Fs1238.photobucket.com%2Falbums%2Fff484%2FDiesel6401%2FRC%2520Boats%2F%3Faction%3Dview%26current%3DIMG_20110113_223026.jpg%26newest%3D1

[rchuntlsl]

Cool thanks diesel.

What bushing is it that goes back in?

is it this one? http://www.offshoreelectrics.com/pro...s-spds-014-bsf

or is it this one? http://www.offshoreelectrics.com/pro...=ros-spdsd-187


or did you get a different one somewhere else??

[Diesel6401]

Cool thanks diesel.

What bushing is it that goes back in?

is it this one? http://www.offshoreelectrics.com/pro...s-spds-014-bsf

or is it this one? http://www.offshoreelectrics.com/pro...=ros-spdsd-187


or did you get a different one somewhere else??

I have used the second one before to convert a 4mm system over to 3/16, I currently use aeromarine bushings now though. What you have to do is remove the stringer and remove both bushing from it. Then with a 1/4 drill bit open the end of the stringer up. Measure and go deep enough so the bushing sits flush with the end of the stringer, after that press (or what I do a small hammer and gently tap) the bushing in. Hard part is drilling straight lol. This is what I use now. http://www.aeromarinerc.com/index.ph...hk=1&Itemid=53

Here's a comparison pic. The one on the left is the stock 4mm, the right is the aeromarine 3/16.

[rchuntlsl]

Holy cow that was easy. Thanks Diesel. If you are ever in St. Louis, look me up. I owe you a beer.

[Diesel6401]

Holy cow that was easy. Thanks Diesel. If you are ever in St. Louis, look me up. I owe you a beer.

I like beer

* Just take your time when you drill and it should come out good. I am pretty sure each pack comes with 2 bushing I am not 100% on that I forget. I just order a few packs at a time. For $3-5 it's a lot cheaper then ordering new hardware. I call my twin El Cheapo lol. $19.99 each for the motors and $10 on props lol... I ran 53mph on 40mm props and the temps were really good so I am going to try some CF45mm props. Big jump in diameter but my outrunners should handle it fine and I hopefully will get high 50s and maybe knock on 60s door.

[rchuntlsl]

I'm planing on running the x442 props. With only 120 amp esc's I don't want to over do it and burn it up. We will see how it does when I get it built. Thanks agin for the bushing idea, you saved me about $100.00.

[Diesel6401]

I'm planing on running the x442 props. With only 120 amp esc's I don't want to over do it and burn it up. We will see how it does when I get it built. Thanks agin for the bushing idea, you saved me about $100.00.

Your gonna run 540 6xl's? That's cutting it close on those 120s and the x442 maybe kinda big on those motors and your rpms are kinda low for twins. For twins you kinda want to be arond 35-38k or so.

I run 1600kv outrunners on a seaking 80ampHV on 6s.

[rchuntlsl]

Did not know that about the higher rpms for twins. if I got some 4s lipos that would spin me at 41,xxx. That seems a little high. Readywatts has a post that says if you put in your single set up in fecalc we can reduce the load in fecalc by 20% with a twin. That puts me in ok shape with the esc.

Or maybe, anyone interested in a fiegao 6xl??

On a good note, I gave the boat to the guy that I am building a house for. He builds carbon fiber race parts for formula 1 cars and he is going to reinforce the boat for $50.00 He is going to put a layer of carbon fiber on the inside. He is going to use the ultra high strength, low weight stuff for helicopter blades. Should be indestructible(almost).

[Diesel6401]

Twin 7xl's would SCREAM on x442s and 4s. Buy 2 4s lipo's and run them in parallel. I have ran the 7xl on a 120 esc before.

Running only 3s voltage limits the motor selection kinda (JMO).

I'm liking the higher voltage lower kv outrunners. Once I burn these up I will get some scorpion outrunners. I LOVE the sound of the twin outrunners.

* I have limited experience with twins, but I asked questions and I like how mine came out.

[rchuntlsl]

I am thinking I will have to change motors from my original plan. Reverse rotation props are very limited. I have run the calcs and i am leaning towards 10xl motors on 6s with the x442's. I don't really want to buy motors and batteries. I have a bunch of 3s lipos on hand.

Diesel, I ran fecalc with the 7xl and the 4s and it is showing 150 amps, I know I can reduce that some with the twins. Did you have problems with the esc over time?

[Diesel6401]

I am thinking I will have to change motors from my original plan. Reverse rotation props are very limited. I have run the calcs and i am leaning towards 10xl motors on 6s with the x442's. I don't really want to buy motors and batteries. I have a bunch of 3s lipos on hand.

Diesel, I ran fecalc with the 7xl and the 4s and it is showing 150 amps, I know I can reduce that some with the twins. Did you have problems with the esc over time?

10xl's would be a very good selection on 6s for this twin. You are moving the right direction with that selection. I only selected the 7xl's because of your interest in running 4s, but the 10xl is a better choice. JMO of course. Yes c/r props are very limited. Right now I am running CF40's and about to try some CF45's. The 40's ran nice and depending on how the cf45 run I will make my choice on metal props. If th 45's run hot I will settle on some x442s if the 45s run good I will grab some x447s.

The 7xl I had ran really hot no matter what prop I had on it. I ranged from 38mm up to a s220 and temps always seemed high. I didn't have any problems with my esc which was a turnigy aquastar 120 which is the same hifei swordfish 120 ose now sells. When I got mine steve wasn't selling them yet. I installed extra caps on the esc and didn't have any issues with it. It took a pounding they are nice esc's.

[6sHyper]

I am thinking I will have to change motors from my original plan. Reverse rotation props are very limited. I have run the calcs and i am leaning towards 10xl motors on 6s with the x442's. I don't really want to buy motors and batteries. I have a bunch of 3s lipos on hand.

Diesel, I ran fecalc with the 7xl and the 4s and it is showing 150 amps, I know I can reduce that some with the twins. Did you have problems with the esc over time?

10xl's on 6s each??? that would be friggin ridiculous!! thing would more than likely FLY............................literally!!! I'm doing 61mph on a single 10xl on 6s1p 5000mah, x442

BTW i just swapped my 10xl out for a castle 1512 so i'm gonna sell it, only run 3 times, never over 130f, ose jacket