what motor for a cf cheetah?

[properchopper]

Sponson Mod ?

Wow, I'm sure glad someone thinks a sponson mod may be necessary 'cause my Cheetah with untouched sponsons feels deprived. I'll get busy hacking them up forthwith -

http://www.youtube.com/watch?v=Cl5ebHR6wR4

[kfxguy]

Wow, I'm sure glad someone thinks a sponson mod may be necessary 'cause my Cheetah with untouched sponsons feels deprived. I'll get busy hacking them up forthwith -

http://www.youtube.com/watch?v=Cl5ebHR6wR4

Are you being serious or sarcastic?

[Fluid]

Tony's Cheetah is ballistic with the factory stock ride surfaces.


.

[T.S.Davis]

Mine wouldn't even plane.

[madmikepags]

they probably have more than one mould and they might be a little different from each other, I have had the same problem with .90 sprintcats, i've built 7 or 8 of them and 2 of them just wouldn't work. For the motor, how many cells are you running? For 4 cell a NEU 1521/1.5d I've had my DF cyberstorm at 70 mph and it is a heavy heavy boat, for 6 cell I always say a 1527/1Y but for more power use a 1530/1.5d 100 more kv and a good amount more power!!!!

[properchopper]

This whole "sponson mod" issue has me scratching my head. It apparently was first brought up by a very well respected FE gentleman who, to put it simply knows his stuff and had a plowing hull which he cured by reducing the AoA of the rear step. Likewise, Terry is highly experienced (way more than me) and I trust his take without question. What cornfuses me is that I built two fairly identical untouched sponson Cheetahs which exhibited no such issues. I'm at a loss to come up with an explanation other than :

1] Like Mike put forth, there may be two molds; one with an incorrect rear sponson AoA and a "good one" like mine

DSC05093.JPG

2] My boat airs out because I run a single motor on 4S2P and the 6S boats that seem to run too wet weigh more

3] Twins are even heavier plus there's twice the prop lift which raises the stern and lowers the bow

As far as motor choice for a 6S single motor rig, one possible choice is the TP Power 4060 4Y 1450KV motor which should get the hull in the sixties propped correctly

http://www.offshoreelectrics.com/pro...p-4060&cat=181

I'll go out on a limb here (violating my principle of posting what I think rather than what I've personally experienced) BUT as what could be charitably described as a widebody hull, the Cheetah may readily take flight as speeds are pushed past the low to mid sixties. Mine's capable of powering/propping way past it's current speed (right around 60mph) but I'd rather drive than row

[kfxguy]

Anyone got a big motor they wanna sell? 1500-1800kv

[properchopper]

[kfxguy]

What's that for? You should reply with a quote so people will know who and what you are referring to.

[keithbradley]

Tony's Cheetah runs great.

The twin versions of these that I have built have ran quite well, with no plowing issues (no sponson mod). This is the first twin that I built for Ben, running on only 5s 1600kv (maiden run):

http://www.youtube.com/watch?v=GLQ2iAtrqCo

The only issue I've personally had with excessive "wetting" is on twins with large props, when letting off the throttle hard. That's more a condition of excessive lift/drag from the big props. I think it may be possible that there are some inconsistencies with these hulls. Perhaps a group of them that were produced in a certain time period have a variation in bottom design...

As far as speed, I've ran the cheetah into the upper 70s, but I wouldn't recommend it. It takes too much power to do so, much more than it would take a boat that is intended for higher speeds. If a straight-line speed demon is what you're looking for, the Cheetah is far from the best choice. A 60mph setup like Tony's is perfect for this hull, and they are a load of fun that way. It's a large hull for 4s in my opinion (I've ran the cheetah on as high as 16s.lol), but it would be silly to say it can't be run on 4s, as Tony is doing it and doing it quite well. Setting a Cheetah up for ultimate speed would be comparable to taking a circle track car to the drag strip.

You can try to see how fast you can go with a Cheetah, but I can assure you that your efforts would be more rewarding if you set this one up to run ovals, and save the speed chasing for a more suitable hull.

[T.S.Davis]

Tony, your hulls' bottom does look different than mine. I wonder if they were modified after the initial offering from Fightercat.

One of my club mates was trying to run one on 4s spec power and there was no way. It was just a snow plow.

After the mods I was running at or around 65 in heat water but with the loss of the material at the edge of the ride pad the turning suffered. You had to really focus to get it through a turn or it would hook bad. Sort of like driving a tunnel boat. A scream to go straight with though.

I have brought this to the attention of TFL who makes the hulls. They're looking into modifying the molds to ensure that the last pad is parallel to the pad ahead of it.

[kfxguy]

Tony's Cheetah runs great.

The twin versions of these that I have built have ran quite well, with no plowing issues (no sponson mod). This is the first twin that I built for Ben, running on only 5s 1600kv (maiden run):

http://www.youtube.com/watch?v=GLQ2iAtrqCo

The only issue I've personally had with excessive "wetting" is on twins with large props, when letting off the throttle hard. That's more a condition of excessive lift/drag from the big props. I think it may be possible that there are some inconsistencies with these hulls. Perhaps a group of them that were produced in a certain time period have a variation in bottom design...

As far as speed, I've ran the cheetah into the upper 70s, but I wouldn't recommend it. It takes too much power to do so, much more than it would take a boat that is intended for higher speeds. If a straight-line speed demon is what you're looking for, the Cheetah is far from the best choice. A 60mph setup like Tony's is perfect for this hull, and they are a load of fun that way. It's a large hull for 4s in my opinion (I've ran the cheetah on as high as 16s.lol), but it would be silly to say it can't be run on 4s, as Tony is doing it and doing it quite well. Setting a Cheetah up for ultimate speed would be comparable to taking a circle track car to the drag strip.

You can try to see how fast you can go with a Cheetah, but I can assure you that your efforts would be more rewarding if you set this one up to run ovals, and save the speed chasing for a more suitable hull.

What hull for straightline speed would you recommend? I also send you some $$ and check your email please.

[kfxguy]

Tony, your hulls' bottom does look different than mine. I wonder if they were modified after the initial offering from Fightercat.

One of my club mates was trying to run one on 4s spec power and there was no way. It was just a snow plow.

After the mods I was running at or around 65 in heat water but with the loss of the material at the edge of the ride pad the turning suffered. You had to really focus to get it through a turn or it would hook bad. Sort of like driving a tunnel boat. A scream to go straight with though.

I have brought this to the attention of TFL who makes the hulls. They're looking into modifying the molds to ensure that the last pad is parallel to the pad ahead of it.

Ill check mine tonight.

[properchopper]

Tony, your hulls' bottom does look different than mine. I wonder if they were modified after the initial offering from Fightercat.

One of my club mates was trying to run one on 4s spec power and there was no way. It was just a snow plow.

After the mods I was running at or around 65 in heat water but with the loss of the material at the edge of the ride pad the turning suffered. You had to really focus to get it through a turn or it would hook bad. Sort of like driving a tunnel boat. A scream to go straight with though.

I have brought this to the attention of TFL who makes the hulls. They're looking into modifying the molds to ensure that the last pad is parallel to the pad ahead of it.

Terry,

While your at it in your discussion with TFL, how about suggesting adjusting the length to 34" instead of 34.25" for the P-Offshore (or P-Cat) folks - it could then run in either P or Q. Makes sense.

BTW I worried about potential hooking so I went with a "largish" rudder & a 1/4" skeg strut stepped to 3/16".

Turns right nicely but struggles ever so slightly on lefts

DSC05100.JPG

[T.S.Davis]

It's so close to a Sprint cat that I never thought about running it on 4s. I also butchered the rear end on mine to give it a little different look.

CHEETAH.jpg

I have a giant rudder too. I have a 1/4" drive and started with the skeg but sawed it off before I shaved the bottom trying to free it up.

It was getting pretty good until Freddy ran me over.