Help me decide with this poll

[Darin Jordan]

i'd suggest the fastech as well. darin, i thought the bj motor was 1500 kv and the sv was 1800?

My testing on the bench shows it to be around 1700KV... The SV27 tests at 1545 or so... and the UL1 tests at around 1999... All using a freshly charged 30C Elite 4500mah 4S1P pack... I've tested several samples of the SV27 motor, and have never seen one over 1550KV or so on a 4S pack...

One more thing about the FasTECH... it has a decent "plunging" V in the front, but quickly transitions to a HUGE (about 1.5" or so) nearly flat ride pad in the rear... so it rides HIGH in the water at speed... but cuts through chop pretty well... Again, it has a sub-surface drive setup on it (or semi sub-surface, anyhow), so it needs some special tweaking to keep in in contact with the water...

[6S HYDRO]

Part of the fun of running the SV is keeping it on the edge of flipping.

Lets face it, if you can learn to drive a SV at speed and keep it on its bottom consistently, then you will have learned a heck of a lot about the driving skills that are required for any boat.

Thats why it will always get my vote as the best starter/ class racer around.

exactly doby, also the fastech is too slow to flip- who want that?

[6S HYDRO]

ive alway found the bj motor much slower than an sv motor on 4s- i believe the hype and my testing that the bj is 1500kv and the sv around 1900kv

[Darin Jordan]

ive alway found the bj motor much slower than an sv motor on 4s- i believe the hype and my testing that the bj is 1500kv and the sv around 1900kv

Not a chance... Sorry, but I've run controlled bench tests with all three, and there hasn't been ONE SV27 motor that tested over 1575KV...

Additionally, I ran the BJ26 motor in my SV27 in the Spec SV27 class in our club, just to test them straight up, and the BJ26 motor was DEFINITELY NOT slower... it wasn't much faster either... This is the same hull, same prop...

The efficiency of the SV27 motor is quite a bit less than the BJ motor as well... The SV27 may have the upper hand in overall torque, but the BJ26 has the best combo of torque and RPMs...

Here is a sample of my test data:

[illz302]

so basicly guys the SV would be a great boat if I either get one with a flood chamber or make my own flood chamber in a new SV? Im not so worried about top speed cause I could always change the motor out later or prop up or any number of things to go a little faster.

One huge deciding factor for me is the quality of the hull and the stickers I hate the look of the fastech but I love the hull of it just not the stickers or paint whichever they are maybe one of you could tell me is it painted on or stickers? Does anyone have any pics of a formula fastech without all the stickers or design on it?

One last thing I am wondering for about the same money I could go with the rio ep and use the vxl3s system in it with just one battery for cost savings and also the vxl system has that cool LVC where the esc reduces power to 50% when it reaches the preset LVC That is a feature I love cause i can get my boat back to shore without swimming or fishing for it.

[6S HYDRO]

the himax 3630-1500 isnt that the same motor, dont they manufacture the proboat motor for them

[Darin Jordan]

the himax 3630-1500 isnt that the same motor, dont they manufacture the proboat motor for them

That's what I was once told... They look identical, except for a slight color variation... Numbers look the same, and I've run them interchangably without a noticable difference.

[domwilson]

Not a chance... Sorry, but I've run controlled bench tests with all three, and there hasn't been ONE SV27 motor that tested over 1575KV...

Additionally, I ran the BJ26 motor in my SV27 in the Spec SV27 class in our club, just to test them straight up, and the BJ26 motor was DEFINITELY NOT slower... it wasn't much faster either... This is the same hull, same prop...

The efficiency of the SV27 motor is quite a bit less than the BJ motor as well... The SV27 may have the upper hand in overall torque, but the BJ26 has the best combo of torque and RPMs...

Here is a sample of my test data:

Interesting. What program is that you are using?

[Darin Jordan]

Interesting. What program is that you are using?

I tested using a test rig I designed. It has an EagleTree V2 or V3 attached to get the numbers... I use a sample load from a carbon airplane prop to give some idea of how they react to a given load. The "thrust" is measured by the test rigs force on a digital scale that is attached...

I power the system using the same batteries that I run with, so I can get some battery performance numbers as well...

Not perfect, but repeatable and enough data to give an idea of what is going on...

[domwilson]

I tested using a test rig I designed. It has an EagleTree V2 or V3 attached to get the numbers... I use a sample load from a carbon airplane prop to give some idea of how they react to a given load. The "thrust" is measured by the test rigs force on a digital scale that is attached...

I power the system using the same batteries that I run with, so I can get some battery performance numbers as well...

Not perfect, but repeatable and enough data to give an idea of what is going on...

Thanks. I'm gonna have to get myself an eagletree.

[egneg]

One huge deciding factor for me is the quality of the hull and the stickers I hate the look of the fastech but I love the hull of it just not the stickers or paint whichever they are maybe one of you could tell me is it painted on or stickers? Does anyone have any pics of a formula fastech without all the stickers or design on it?

They are stickers. Here is one that I painted for a friend.

[Flying Scotsman]

Is this your first boat? I would go with an updated UL1, why? fast and a way better radio.

Douggie

[RCprince]

The BJ motor is a better motor, The rotor is better balanced. and I run mine on on 6s in my SV( I have a BJ motor in my SV27).

http://forums.offshoreelectrics.com/...7033#post37033

[Rumdog]

Actually, if you want a really great boat, check out the Titan JesseJ has for sale in the swap shop. That boat rocks, and won't flip on ya!

[RCprince]

My testing on the bench shows it to be around 1700KV... The SV27 tests at 1545 or so... and the UL1 tests at around 1999... All using a freshly charged 30C Elite 4500mah 4S1P pack... I've tested several samples of the SV27 motor, and have never seen one over 1550KV or so on a 4S pack...

One more thing about the FasTECH... it has a decent "plunging" V in the front, but quickly transitions to a HUGE (about 1.5" or so) nearly flat ride pad in the rear... so it rides HIGH in the water at speed... but cuts through chop pretty well... Again, it has a sub-surface drive setup on it (or semi sub-surface, anyhow), so it needs some special tweaking to keep in in contact with the water...

Darin, in your opinion, which is a better motor regardless of kv, the BJ or UL1?