S!N!ST3R RC hObbys

will the stock motor and esc take x2 7.4v 22c 5000mah lipos by SMC???, AND WITH THE right prop what speed should it run?

SV27dayton

I'm no lipo expert but that's less voltage than running on 14 cells so I'd think it should be safe. I'd say if you air her out you should see high 30's - low 40's.

Lunchbox1019

I am no expert either. I have been running 20c lipos for a few weeks now and the SV27 loves it. You will probably have to adjust your trim tabs a little negative as the stock setting for me was way too unstable on the top end. I have tried a few props, but for me any of them are fun with the lipos. I have not measured the speed but dayton is probably right. People who dont know any better say they think it is going 60+mph. But 35-45 sounds about right to me.

Silent-AV8R

I run my SV on 25C 3700 lipos (two 7.4 volt in series = 14.8 volts). With a x440/3 prop I have gotten it on GPS at 37.8 mph.

Your packs will be fine.

S!N!ST3R RC hObbys

will those lipos 5000mah last real long??? i had venom nmih batterys in my bj26 and ran on top of the battery life for maybe 6min then lost lots of power...but theses are rated22c thats a lil better right, oh and Dayton how did you take the anodized off the rudder and hardware again?

dicko

oven cleaner works well, but it's caustic so do it in a well ventilated area with rubber gloves on.

SV27dayton

Precisely!

put it on, take it off, put it on again. Don't leave it on any longer than you need to b/c it will begin to pit the Al.

S!N!ST3R RC hObbys

If I buy the hydra120 will it take (x2)-SMC 5000mah 11.1v 22c =( 6s w/10000mah ) will the hydra tkae these kinnda volts and amps??? Also what size feaigo motor should i run, i was thinking a 540 9xl???

CadillacDTS2001

hydra 120 is said to take 6S. but if you run 6S about 90% of people who ran 6s on that esc burnt it up
6S is to much for the hydra series unless you buy a HV serise

S!N!ST3R RC hObbys

what about 5s? can you put a 11.1v 3s and a 2s 7.4v 5000mah cap, together??? will that work?

dicko

no, you'll overload the 7.4V battery & cause damage. if you're using Lipo, use 2 indentical batteries.

Silent-AV8R

OK, I regularly run my 10S boats using a 6S + 4S arrangement. I do make sure to match the "C" rating and the capacity.

So my 10S boats are 4S 25C 5,000 mAh + 6S 25C 5,000 mAh.

Works just fine.

What is critical is to match the discharge rate (C) and the capacity (mAh). It is also good to use the same set p all the time. So I sue the same packs togeher in each boat. And I am running this as a 10S2P set up.

NitroNuisance

Yes there is a guy on youtube running 5s with a 3s and a 2s just fine. Like Silent said they need to be the same c and mah rating but it'll be fine. I'm planning on running that set-up sometimes after I get my 2-2s 5000hv 20c's to go with my 2-3s 5000hv 20c's. I'de watch temps and not run for long periods of time like that but if you do it and give bursts of full throttle and check temps with a conservative prop (maybe 38-40 to start) I think you'll be OK. Wait a month for my lakes to thaw out and I'll let you know how it works. I can't wait any longer for spring. I got 2 boats set-up this winter and the anticipation is killing me for theit maiden runs!

S!N!ST3R RC hObbys

Yea, i saw that on youtube and he told me to do that, its a yellow sv27, its sweet.

S!N!ST3R RC hObbys

Ok to keep it simple, with one battery, Im going to get the MaxAmps 10000mah 18.5v 5s pack lipo, and the Hydra120, Feaigo10xl, and with the right prop, maybe an x440 or 442, do you think ill be seeing the 50's on the SV27? Im just making sure before I throw $900 away lol, Im only consurned about the right battery...??? will the maxamps push it that fast???

Silent-AV8R

Well as a reference point I have a 32 inch mono (Delta Force CyberStorm) with a 10XL and Hydra 120 running on 4S2P and I run high 40's to low 50's with props between a 442 and 447.

50 mph is an awful lot to ask of an SV hull. My stock SV runs high 30's with 4S1P and a 440/3. Not saying it can't be done, but you are right on the ragged edge of what the hull can do and trust it gets wearisome running there.

S!N!ST3R RC hObbys

So your saying that the feiago motor and esc / battery i mentioned will be pushing atleast 45mph..lol well im gunna add some weight and do some work to the hull, but that dude in the youtube video emailed me and claimed 51mph on gps with his sv27, and its moving, im not interested in big 50in hulls so...anyways.

Silent-AV8R

Fine by me. I was just giving you hard examples of similar set ups. A 10XL on 5S will be turning about 30,858 rpm (and a hair over 35,000 with fresh packs), which is ripping. My 10XL on 4S turns 24,686 rpm. So with 25% more rpm I have no doubt that the SV will surpass 50.

It's sort of like putting a turbine in a VW, but if that's your deal, then have at it!!

S!N!ST3R RC hObbys

Well, i mean, with no wind, calm days, it should be ok, but I like knowing you have to much power lol....so yea thats my deal...

Silent-AV8R

All I can say is that personally, I would not waste my time doing it. Sure, under ideal conditions you will have a very fast boat. One that you will spend more time retrieving after it flips than you do running it if those conditions are ever less than perfect.

We raced an SV class at the WW IV race this past weekend. We raced both a 4-minute offshore race (max laps in 4 minutes on a course that requires both right and left turns) and straight up oval racing (1-mile sprint race).

In race conditions you can't really keep this hull on the water much over 40. Most of us propped down to run mid-30's.

But if all you are interested in is going as fast as possible in a straight line until it blows off the water, you are on the right track.

There are better ways to go fast. Every hull has it limits.

SV27dayton

I'll second that. I'm still running the stock motor with Nimh bats, set up to run dry and fast. I'll run for a while and back off as the boat gets unstable at the end of the straits. Towards the end of the run I'll wring it out a little longer (usually close to me running parallel with shore) it'll blow over on just a mild ripple. I was going to put the ammo in it, and it would be fun but I've decied to build a cat instead. I love the SV and will likely still run it more than the cat but It comes with enough power out of the box. (never thought I'd say that about anything).

(Best numbers I've produced is 39.7 via GPS on 12 IB4200WC's, light chop, had to retrieve it to look at the number)

Silent-AV8R

Make no mistake, the SV is a great boat. But any hull suffers when it is pushed past it natural limits. Some enjoy that. I don't. And we had a blast racing them neck and neck this weekend. Trust, 6 boat heats of boats doing high 30's is a rush!!

SV27dayton

I love mine because it's so close to the limit out of the box. I think for that reason it's an excelent boat to build skills with. I may still try to make it go faster when I start using it again but for now I'm going to have fun with it and work on the other project.

jeeprubicon2k3

When buying Lipos you gotta play the weight game. Compare the new weight(lipo) to the old weight(nimh). My IB4200 parks are around 400gr each, with 2 of them in the boat it sinks deep into the water. If your were to run 2x7.4v 2200mah lipos @ 115grs for a total of 230grs, thats just more then half the weight of one nimh pack!!! I think you will see your best speed improvements by balancing weight and run time. PLUS, a lighter boat cavitates less off the start!

I may go with 2x4s1p 2250 packs in parallel for a combined weight of 510grs. 800-510grs=390grs savings at 4500mah run time.

alloutcustom

Run a 9L on 12cells or 4S lipos if you want to go faster. That should get you close to 50