Zonda now lifting

[tlandauer]

What do you want to know Tim?

Hi Keith, hope you had a great summer!

What I want to know perhaps is a very general question. I am aware that each hull is different, but in general when you set up a twin for Offshore ( roundy round in my lingo) , what to you start out with? props turning inward or out? I know (remember) reading that one way it helps to turn and another helps to plant the transom and allow the boat to air out.
I just want to have something that I can remember by, too many readings and getting old can't remember anything, this time I will book mark it.
I built an Intruder S (H&M) and I had her props turning inward, turns very well but the bow is not lifting enough. If I reverse the rotation, would I see any difference before fiddling on the thrust angle of the stingers?
Thanks much in advance!
Cheers!

[keithbradley]

Something odd is happening if you went from 0 degrees to 4 degrees negative and it's blowing over. No way the props could have that profound of an effect unless you had lifting props on it before. What were your other props?
As an example, I went from x4 props on my 39" cat to ABC props without changing anything and it ran beautifully both ways.

[keithbradley]

Rotating the props inward on a typical twin cat will lift the transom. This keeps the front end down but also can cause spinouts and compramise cornering. The effect will be relative to the amount of lift that the props will produce, so high rake props like the OP'S won't provide much lift either way. With something like a propshop prop or the old lower rake ABCs, the difference can be profound.

Strangely, this does not apply when the drives are close together, such as with setups like twin monos.

EDIT: yes, you should see some difference spinning them the other way. Whether or not it runs well this way will be apparent when you try (I'm not sure how that hull will run either way).

[tlandauer]

Rotating the props inward on a typical twin cat will lift the transom. This keeps the front end down but also can cause spinouts and compramise cornering. The effect will be relative to the amount of lift that the props will produce, so high rake props like the OP'S won't provide much lift either way. With something like a propshop prop or the old lower rake ABCs, the difference can be profound.

Strangely, this does not apply when the drives are close together, such as with setups like twin monos.

EDIT: yes, you should see some difference spinning them the other way. Whether or not it runs well this way will be apparent when you try (I'm not sure how that hull will run either way).

Thanks again and book marked!:-)

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[MG1234]

Went to the lake ,the Zonda didn't blow over after moving the ESC and lipos 1" forward ,raised the struts 2mm ,hull still a little wet but really fast ,struts are still 2mm negative ,I'll try again with them at 0, after raising them the boat was more susceptible to spins and general crashing at speed ,but no blow overs ,I still want to know about left and right couplers ,thanks

[montymike]

I would like to know a boat l& r couplers also.

[tlandauer]

There aren't that many available. TFL makes a stainless steel .187 collets,http://www.kintecracing.com/Collets_Couplers.html ( 5th item down)
As for . 150 l have not seen yet. I use MBP' s clutch type collet and they are for standard rotation only. Because it's such high quality stuff, l don't worry about it. http://www.offshoreelectrics.com/pro...?prod=mbp-1000
That having said, I asked the same question many moons ago and the consensus was that no matter which type of collet, they should all work. The rotational mass is small enough that even a CW turning shaft should not loosen a collet that is machined for CCW rotation.

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[montymike]

There aren't that many available. TFL makes a stainless steel .187 collets,http://www.kintecracing.com/Collets_Couplers.html ( 5th item down)
As for . 150 l have not seen yet. I use MBP' s clutch type collet and they are for standard rotation only. Because it's such high quality stuff, l don't worry about it. http://www.offshoreelectrics.com/pro...?prod=mbp-1000
That having said, I asked the same question many moons ago and the consensus was that no matter which type of collet, they should all work. The rotational mass is small enough that even a CW turning shaft should not loosen a collet that is machined for CCW rotation.

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Thanks:will stop hunting for one...

[wdac]

prop makes a Cat flip as a superman? not the prop, prop angle, CoG, and its a Cat, its ment to run on a airbag trapped in the tunnel... tweaking, tweaking, tweaking.... for the right setup.

[kfxguy]

prop makes a Cat flip as a superman? not the prop, prop angle, CoG, and its a Cat, its ment to run on a airbag trapped in the tunnel... tweaking, tweaking, tweaking.... for the right setup.

Have you run the new series of abc 17 degree rake props?

[wdac]

bigger blades than other prop makers, more pitch produce more speed, propload and torqroll, but making the Cat force down the transom and blocking the air to you get flying. no that not the prop, thats the strut setup and weight CoG placement in the boat due to the prop producing more "thrust"... and thats the story with all props, you need setup your boat for the prop you want to run... imo...

[kfxguy]

bigger blades than other prop makers, more pitch produce more speed, propload and torqroll, but making the Cat force down the transom and blocking the air to you get flying. no that not the prop, thats the strut setup and weight CoG placement in the boat due to the prop producing more "thrust"... and thats the story with all props, you need setup your boat for the prop you want to run... imo...

So, you didn't answer my question......

[wdac]

i used to own a ABC Series 4255, today i run on GrimRacer L42x55...

[kfxguy]

i used to own a ABC Series 4255, today i run on GrimRacer L42x55...

So it's not the NEW 15 series with a 17 degree rake.ok. That's what I thought. I suggest you try some and then come back and try to tell me the same thing you did above. It can be tuned out yes, but just simply putting one of (or a pair) these props on definately makes the front come up a lot more than any other props I've tried.

[srislash]

So it's not the NEW 15 series with a 17 degree rake.ok. That's what I thought. I suggest you try some and then come back and try to tell me the same thing you did above. It can be tuned out yes, but just simply putting one of (or a pair) these props on definately makes the front come up a lot more than any other props I've tried.

I agree with Trav here. I was running the 1815's and just step up to 1915's that Chris cut to 47mm. I changed nothing other than props and it went back to nose in the air. It was set up nice for the 1815's.