SV motor on a gear drive.....

[FE_Chris]

OK...Im going to be racing the Titan29 I have coming. My setup is as follows.

Titan29
BK 70amp 6-16 cell ESC
SV 27 Brushless Motor
FDM Gear drive
4s1p Lipo or 12 Nimh cells

I have no idea where to start with gears. I kinda do on props. I have quite a few props and the boat is coming with a couple more. I was going to start out on the x440 and work up from there.

But gears....I have absolutly no idea where to start on the gearing. The motor is already a 6-pole motor....1400 or so KV....I do believe anyway....so tourqe is not an issue. but gearing it down seems like it might not work all that well.


I was thinking of gearing it 1:1 and just running it thay way to see how it works. I know i'll loose some efficency through the gear box...just thinking....

any comments or ideas welcome!!!!

[andym]

With todays power systems and a smaller hull why bother with the box?

[SJFE]

Gear drives are really ment for larger hulls with some weight to them. I would just run it direct save the extra setup up work

[FE_Chris]

Well, the gear is already in the boat. If it's not mounted all crazy and epoxyed in like mad, then thats what I am gonna do. But the boat is not here yet, so I am just planning on it being all tied up to the hull.

Removing the gear drive is something to think about. This boat is really only going to be raced, it's not a fun runner, or atleast thats not how im putting it together as. I was just wanting to leave the gear box in maybe incase I wanted to toss a 9xl or something in the hull for some fun runs.

Thanks fellas. You always seems to have a way of enlightening me. haha

[Steven Vaccaro]

It I was going to only race I would do what the other guys said. Ditch the gear drive. Its just another place to have a problem that will keep you from finishing.

[Flying Scotsman]

It I was going to only race I would do what the other guys said. Ditch the gear drive. Its just another place to have a problem that will keep you from finishing.

Agreed and use a more powerful motor than the SV27. A 10XL or possibly 9XL (do not run the boat wet) will work with your ESC and X440

[FE_Chris]

The thing is, the boat is going to be raced in the LSO class. They told me they allow the SV motor to be used because it develops about the same amount of power as a 700 size motor.

Scotsman....I try to never run my boats wet :-)

Agreed and use a more powerful motor than the SV27. A 10XL or possibly 9XL (do not run the boat wet) will work with your ESC and X440

[Flying Scotsman]

[QUOTE=FE_Chris;14158]The thing is, the boat is going to be raced in the LSO class. They told me they allow the SV motor to be used because it develops about the same amount of power as a 700 size motor.

Chris, if that is true the SV 27 is a great choice. I think it will spank a 700 size motor with the right prop.

Doug

[Steven Vaccaro]

Flying is correct. A 700 will be at-least 10-15% less in the power area. I hope that they don't expect guys with 700's to have to compete against aqua bl motors. That's not a fair race.

[FE_Chris]

I guess thats the way they run them now and everyone is happy. Still, the points leader runs a 700 motor, and 12 nicads.

So really, Titan29 700 powered, Vs. Titan29 SV27 Motor powered you guys think the SV motor powered boat will win hands down?

[Steven Vaccaro]

If you set up the same boat and swapped motors and prop, the aqua motor will be faster in a straight line.

[SJFE]

That's not a fair race.

I Agree. The only way to even attempt to level that out is to let the 700 boats run a 4s2p..& the bl boats run Nimh. Thats still a maybe.

[Doozie870]

Im not scared, its all in the cooling baby!! How does 65 amps continous grab ya on a 700, com is perfect after 3 minutes.

[SJFE]

Thats right man lay down that smack...You can back it up.

[Jeepers]

[QUOTE=Steven Vaccaro;14170 That's not a fair race.[/QUOTE]


I would have to not quite agree with that, I have watched a 700 mono on 12 ib 4200s against 3 SV27 on ib 4200s go head to head on many occasions, I know that 700 mono placed 1st or 2nd almost every race it entered.


A single 4s pack would be more than enough for 700 motors, you should see how they run on 2 2s packs in series, especially in a hydro!