Zonda now lifting

[MG1234]

Hi guys my Zonda had regular 45mm props ,has 2150 kv TP motors ,on 6s it was fast and stable but I didn't want to spin 40000rpm,so I got some ABC 1815 ,they are also 45mm,but stupid fast on 5s which is what I wanted ,but the front lifts and it blows over and I'm not going that much faster,I lowered the struts maybe 4mm ,a little at a time ,but isn't working ,I'm wondering if these props are designed to lift? I'm ready to take them off ,any tips please,I can lower the struts a little more ,batteries are forward ,help please,

[kfxguy]

Man if I tell you the term I use to what's happening some of the old hard headed guys are going to get bent all out of shape (this is a very new series of props which I think calls for a different terminology than what these hard heads are used to). So let's just see if I can help you. This is the norm for these props. On the other props you used, you likely had some positive in your struts (props angled up a tad). With these because they lift the nose of the boat out the water more, you'll need to set the struts at level or right below level. I never like to run a strut below level (negative) so I what I do it add weight to the front i.e. Move batts way up, move escs up etc. then if that don't get it, give the struts a tad of negative. Don't take the props off, tune the boat. You'll be glad you did because they are a good bit faster, pull less amps and much smoother once you dial it in. Don't throw the towel in just yet. I lined out a twin today with that series props on there and it took moving the escs further forward to keep it down. It was 6+mph faster just on low voltage than a bigger sized cnc props.

[MG1234]

Thanks ,the way it changed so drastically I figured the props were doing it ,I have the ESC and batteries all the way forward so I'll check the negative camber? of the struts ,it was starting to damage my boat ,thanks for the help ,so good props ?

[kfxguy]

Yes I like them. You'll just need to adjust things to compensate. You'll thank me later.

[srislash]

You will find you will need to 'tune' your boat for each new style of props you try. Some react differently or should I say make the hull react differently. The high rake props seem to dig into the water on the the back resulting in a flighty front end. It really does take some tweaking. I ended up putting a 4oz fish weight in the nose to hold it down at one point on my Fantasm.
Geez, I guess I just stated what Travis did, that's ok you can't go wrong with his advice.

PS: sorry for steering you into the big boat lingo Travis(bow l---)

[MG1234]

I'll work on it tomorrow and run it ,I'll post how it goes thanks

[MG1234]

What do you think about the air damm that goes under the boat between the sponsons to disrupt the air flow ? I ran one on my cat till the nose got so heavy I didn't need it anymore ,should I try it on the Zonda ?

[srislash]

I have not tried that as of yet. It would be worth a try. Some guys tape a wiper blade up there.

If you try it please post what the findings are.

[MG1234]

I will thanks

[keithbradley]

Hi guys my Zonda had regular 45mm props ,has 2150 kv TP motors ,on 6s it was fast and stable but I didn't want to spin 40000rpm,so I got some ABC 1815 ,they are also 45mm,but stupid fast on 5s which is what I wanted ,but the front lifts and it blows over and I'm not going that much faster,I lowered the struts maybe 4mm ,a little at a time ,but isn't working ,I'm wondering if these props are designed to lift? I'm ready to take them off ,any tips please,I can lower the struts a little more ,batteries are forward ,help please,

Assuming that your old props were 1.4p, it looks like you went WAY up in prop. The x4 and 17* rake ABC props have pretty similar lift characteristics, so this should be a pretty easy fix.
Which way are you currently spinning the props? If you look at the top of the props, are the blades going in toward each other, or out away from each other?

[MG1234]

Tops spin towards each other ,while I have you on the line ,I'm building anouther twin I bought used ,it has both couplings right hand ,my Zonda has a left hand on the starboard side ,is is important to have a left hand coupler and what side should it go on to tighten down as the motor spins ?

[tlandauer]

Assuming that your old props were 1.4p, it looks like you went WAY up in prop. The x4 and 17* rake ABC props have pretty similar lift characteristics, so this should be a pretty easy fix.
Which way are you currently spinning the props? If you look at the top of the props, are the blades going in toward each other, or out away from each other?

This I want to learn as well, if Keith would see and respond, I will be thrilled.

[keithbradley]

It's odd that you've lowered the strut and it's still blowing over. First, by "blowing over", you do mean that it will inevitably flip backward at high speed/heavy throttle, not just that it crashes sometimes, right? Video would help as I have seen people with too much lift in the rear use the term "blowing over" when they crash.

Counter rotating collets are not needed.

[keithbradley]

This I want to learn as well, if Keith would see and respond, I will be thrilled.

What do you want to know Tim?

[MG1234]

This is my 1st summer with boats ,and I'm still way down the learning curve ,but the front will lift and the boat goes flying about 20' ,starting to damage the hull,the struts are about 4mm negative camber ,with the other props and the struts at 0camber it never lifted ,my genesis was the blow over King till I finaly got it worked out ,I did move the ESC and batteries forward about an inche ,haven't ran it today yet after these changes ,but the props started the blow over ,I didn't change anything but those ,it doesn't seem like it's going that much faster to cause this ,it used to be so stable ,