insanely overpowered cat?

[Jesse J]

I am hoping I can get a little feed back on why my cat might be doing such impressive flips.

This is a 27" balsa/ply cat scratch built by me from Shockerman plans. I have a Proboat motor with a Turnigy 100 amp HV ESC with water cooling. This run here spins an X640 on 6S.

I am wondering if I might need to back off to 5S? or smaller prop?

CG is right about 33% and strut is about level with base of sponsons with 3deg positive? (bow up). I am working with a strudder these runs (the one from OFE) with a .062" wire drive. I am also wondering if she is too light, maybe 3lb.

Any ideas would be nice. The batteries are sitting kinda high and might be contributing to the rolls at lower speed, but the nose-dives are kinda weird. I would expect blow over, but nose divez?

http://www.youtube.com/watch?v=ylqJvX1Y9qw

Hey Peter, how's this for a little better "entertainment" grade moviemaking?

[Fluid]

Several thngs to try:

- Raise the strut, try it with the bottom 1/4" above the sponson bottoms and flat. Use a flat table, don't try it 'by eye'.

- Move the CG back to 32%.

- Try an x440 prop.

- Try adding 8 ounces of lead low in the hull at the CG.

- 5S is an option....



.

[Punisher 67]

Awesome video Jesse , man that little sucker really hauls

[LiPo Power]

Hey Jesse
Could you please be more aware next time?
These are Canadian Geese ok..... We need them back when they finish fertilize all the green easy to walk at the moment grass arround the homes....

[Tunda]

Jesse you need to run her in a bigger pond..........

[Jesse J]

Thanks Jay, will try those ideas.

I am aware, Robert, that these are the buggers who COVER the sidewalks with this "fertilizer" so running them off has actually become encouraged here in Denver area.

Tunda, the problem with a bigger pond is that I have to cast farther with the retrieval rod to recover the upside down kitty.

You like Peter? Figured you might get a kick out of some tunes.

[Jesse J]

Well I incorporated all of Jay's comments AND backed off to 5S. I think she is about right now. The only thing is she gets a little wobbly at speed on anything but glass. Would this be strudder related?

This is a short one and no tunes, sorry bustit and Peter, in a rush and wanted to get this out as an update. Will get some better/longer footage soon. I need to get my rx pack more secured, it came loose and got all wrapped up in the drive line.... I know, rushing to get it on the water. I did, however, put some shots of the rear end in there so you can see JUST what is making this thing move. I have a CC 120 in there to handle the higher than Proboat-standard amps, but the motor is still the same proboat guy.

http://www.youtube.com/watch?v=sh66NNFDDSE

[Jeff Wohlt]

Damn dude...and with one of my 62 wires! Guess loctite is stronger than solder! Looks like one of my older SS struts with bearings.

I have your other drives going back out shortly. I really think you should stick with 78 myself.

And YES, the inline rudder can play hell with handling in prop wash

Holy cow...on the 5S is did a 360 roll and still landed right!! That was cool!

[sailr]

Man! She cooks. You need a bigger lake! I'm wondering if that long rudder is causing you some handling problems. When the boat gets airborne a bit the rudder is still hooking up...throwing you off. Not sure. I'm no expert in that area. Just a thought. Anyone else think the rudder is a bit too long?

[Jesse J]

These are the exact reasons i am soliciting comments! I have a rudder I could throw on the side.

Yep, Jeff, she did at LEAST a 360 if not twice barrel roll and landed wet! This did knock loose the rx pack and man that was a mess.

She gets wobbly at speed. Well, I can try adding a rudder and just remove the inline one from the boom without too much trouble.

Too long of a rudder? anyone else have this idea?

Yes I do have a bigger lake, but for a 15 min break before and after work that is 5 min walk from the garage, you can't complain much (that is if you aren't water fowl).

[sailr]

Man, I hear ya about that 5 minutes to the lake! Looks like a beautiful development you live in! In your second video it looks like the lake is longer than I thought!

These are the exact reasons i am soliciting comments! I have a rudder I could throw on the side.

Yep, Jeff, she did at LEAST a 360 if not twice barrel roll and landed wet! This did knock loose the rx pack and man that was a mess.

She gets wobbly at speed. Well, I can try adding a rudder and just remove the inline one from the boom without too much trouble.

Too long of a rudder? anyone else have this idea?

Yes I do have a bigger lake, but for a 15 min break before and after work that is 5 min walk from the garage, you can't complain much (that is if you aren't water fowl).

[Jesse J]

Google Earth says it is over 200' in most directions. I do have the fountain to avoid and the walls are cement, so better to avoid them too. Ducks tend to clog the prop but they are getting the idea that it is better to avoid me.

I will try to get a shot this evening after they turn off the fountain. It would be perfect for mini racing...

[Punisher 67]

Was just thinking the same thing as Jim , that certainly is a beautiful neighborhood you live in Jesse.................

[Jesse J]

We LOVE it. Too bad it is only for this summer while I work on my "mentorship" for my research. We head back to Bozeman at the end of August...

[bustitup]

I like it.....super nice build

the music was awesome too...I acually stayed awake this time


the only thing I didnt like was how you past up all those points...those ducks are easy ten pointers one of them was maybe a 15...must have been the mother