Prop for Toysport syncron

[BHChieftain]

Lookin' for recommendations for a prop for a toysport syncron. I'm running a 540 8XL with 4S1P.

Thanks
-Chief

[Jeepers]

M440 works good on an 8xl to start.

[BHChieftain]

What's the diff between the X and M series? I do have an octura X440/3 prop-- it fits the shaft but the drive dog on the syncron is a little bit too big (but can still work).

-Chief

[Jeepers]

X and M are almost the same prop but the M series has the tongue of the prop removed.

[BHChieftain]

Thanks. What's the Y series?

-Chief

[Ctonez]

If your just sporting around, I'd actually go a little smaller if you have the props. I've run an 8XL in a 33" hull on 4S for heat racing. The 440 got my setup a little warmer than I liked in a 1 mile heat. Good prop for the setup, but you'll have all the speed you can handle with the Synchron. Get a 437/3 and detounge it for a milder, but longer running rig.
Get video, it oughta be a rocket!

[BHChieftain]

First test run video is under Boat Building, thread is "Syncron build-Newbie"

-Chief

[BakedMopar]

IMO I would use at least a x637. Are you running hot with the current setup? You need a prop that will push that size of a hull efficiently. It also depends on your setup.

[Steven Vaccaro]

I ended up with a x642 for 3-4 minute racing and a x646 for some 1-2 minute sprint racing.

[BHChieftain]

IMO I would use at least a x637. Are you running hot with the current setup? You need a prop that will push that size of a hull efficiently. It also depends on your setup.

Test run with a 45mm graupner prop-- lipos and esc cool, motor can was warm, but the rotor was very hot (don't have a temp gauge, did the finger test... had to pull my finger away from the rotor). Still not sure if that counts as a "hot motor" or not..

-Chief

[BHChieftain]

I ended up with a x642 for 3-4 minute racing and a x646 for some 1-2 minute sprint racing.

I have one of those props on a different boat so I can test it. The x642 has more total pitch than the graupner 45mm so I would expect it to run hotter but who knows-- apparenly prop selection is a dark art...

I do have a general prop question:
If I have 2 props that both have about the same total pitch, but one is 1.4 base pitch and the other is 1.6 base pitch, how will these react differently?

For example, how would these differ, all else being equal?

x440 , total pitch 2.310
vs
X637, total pitch 2.368

(let's pretend they both actually have the same total pitch, so the only difference was 1.4 vs. 1.6...)

Thanks
Chief

[Ctonez]

rotor heat is not good. It might not be caused by prop choice though. Look at the interface between the collet and the prop shaft...if the prop shaft is too far in the collet and possibly touching the motor shaft, there could be some friction there.
Does the prop shaft get hot? If it is rubbing too much then heat will transfer right through the collet and heat up the rotor as well.
A thrust bearing couldn't hurt. I run 'em on every boat I have.
I'm just shooting out possiblities, go one step at a time to really trouble shoot this and you'll get it running reliably.

How much run time are we talking about?
Was the boat running wet or loose?
definitely get a temp sensor, they're cheap.

[Ctonez]

...looked at some of your build pics.
Is the shaft coupler flush against the motor? it looks a bit close.

[BHChieftain]

...looked at some of your build pics.
Is the shaft coupler flush against the motor? it looks a bit close.

Hi,
I do have the coupler flush, but it is flush against a thrust bearing which you can't see in the pics-- should I have a space between the coupler and thrust bearing?

The run was about 5min, handling was rock solid. Most of the run was at about 1/2 speed or less as I was dialing in the trim and getting used to the steering input, speed picked up at the last 1/3 of the run. Here' s the vid:

http://www.youtube.com/profile?user=BHChieftain#p/u/0/1cE3gqoaTGc

Thanks!

-Chief

[Flying Scotsman]

I have one of those props on a different boat so I can test it. The x642 has more total pitch than the graupner 45mm so I would expect it to run hotter but who knows-- apparenly prop selection is a dark art...

I do have a general prop question:
If I have 2 props that both have about the same total pitch, but one is 1.4 base pitch and the other is 1.6 base pitch, how will these react differently?

For example, how would these differ, all else being equal?

x440 , total pitch 2.310
vs
X637, total pitch 2.368

(let's pretend they both actually have the same total pitch, so the only difference was 1.4 vs. 1.6...)

Thanks
Chief

Depends on a lot of things..,boat...motor... volts...setup...racing...sport

The pitch may be the same but the diameter is very different. A larger diameter may suit an application where torque is required and you are running a large motor with a lower rpm to voltage spec and a high reving smaller motor with a smaller diameter but higher pitch may hit the sweet spot. Unfortunately there is no simple resolution rather than to experiment and watch temps...amp draw...speed etc.

Douggie