Graupner Systems Cat

[Rcfreak]

Maby in the future i want tho buy the Systems cat of Graupner.
What drive motors and cells are the right choice for this boat
And do you have tuning tips for this boat???
I want max speed!!!
Grauper Systems cat Video (http://www.offshoreelectrics.com/Videos/offshorerace.mov)


http://rcgallery.net/data/524/5465larry_systems.jpg

Graupner Systhems Cat (http://www.graupner.de/prod_en_schiff_elektro/2118.asp)
http://www.graupner.de/prod_images/schiff_elektro/2118.jpg

[Dick Crowe]

Harry, you are right, the 8.4 is the best bang for your buck, but I've played around with the SS1 quite a bit this year and it's shown a few other benifits. A little more speed then I expected and almost no heat when pushed! Perhaps it will hold up better over time. Is it worth 15 more bucks???? If 15 bucks is a big deal then stay with the 8.4. Otherwise, I think the extra money is well spent.

Good luck,
Dick Crowe

[Dick Crowe]

Thanks Harry,
I wish I had a clue about cats. I think they are cool but I don't know what goes where.

The SS1 is for real though. The SS1 runs really cool which tells me it's probably more efficient which is always a good thing! Besides that, it really is faster, maybe 2 to 5 MPH depending on the boat. It seems better built too. Bigger fan, better brushes, bigger vent holes, stronger magnets, you can actually feel them when you turn the motor over by hand! If 15 bucks is the difference i'd say it's money well spent. But, if you've got the 8.4 already and you don't race, save your money for batteries, props or take your wife to dinner (she might let you buy a Hacker if you do!)


Good luck!
Dick

[avalentine]

I would agree. Unless you intend to race, by race I mean travel to a national event, stick with the 8.4. Best bang for your buck. Mid-High 20's are possible on 12 cells, with great run time (3 min plus) if you get everything balanced appropriately and get it trimmed well. Play with prop angle and depth where possible along with center or gravity to make it plane as high as possible with out loosing control.

For a NON-budget example, here's a photo of one guy racing in Batavia, IL two years ago. Aveox brushless power and 12 cells turned it into a rocket!

http://www.emyc.org/msboard/messages/5/147.jpg

You can see in the photo that very little of the boat is in the water if at all. This is great for straigh line speed, but make it run too loose and control can become a problem.

I'd drop in an 8.4 and try an x642 to start. Most that I have seen have the outdrive system removed and use some harware similar to this set up, minus turn fins.

http://www.emyc.org/msboard/messages/5/82.jpg

Solid strut, rudder mount. Allowing you to adjust the strut depth and angle. An outdrive system looses efficiency in the joints, and a steerable outdrive can become very hard to control at higher speeds.

Start with the 8.4 and work your way up

[Andrew Gilchrist]

for fun running definitely go with a 700 8.4 and 16 cells although I would use a 442

16 X CP1700's are cheaper lighter and faster than the 2400's; runtimes will be 4 minutes +

the 90 rc-hydros is overkill the cheaper controller will do the trick

see speed kits page at www.fastelectrics.com for mix and match kits

The stock graupner outdrive will work well

One trick with the hull which helps handling significantly is to remove the little wedges Graupner moulds into the rear of the running surface - these were designed to assist withe low power setup specified on the original hull.

[avalentine]

Originally posted by harry m.
Andy V., what is the name of the white mono? I dont want to change the subject or subject line but that is SHARP with a capital S!

That is a Blew By You Boat works (http://bbyracing.com/elecmonohulls.asp), Oval Master. It's an ABS mono hull for 6-8 cells. Very comeptitive design, another club member runs a Carbon Fiber version and presently has us amazed with his speed!

If you want more info, start a new thread or PM me.

[avalentine]

Originally posted by Andrew Gilchrist
for fun running definitely go with a 700 8.4 and 16 cells although I would use a 442

16 X CP1700's are cheaper lighter and faster than the 2400's; runtimes will be 4 minutes +

the 90 rc-hydros is overkill the cheaper controller will do the trick

see speed kits page at www.fastelectrics.com for mix and match kits

The stock graupner outdrive will work well

One trick with the hull which helps handling significantly is to remove the little wedges Graupner moulds into the rear of the running surface - these were designed to assist withe low power setup specified on the original hull.

16 cells could be the difference of $15-30 per pack over a 12 cell set up. Then keep in mind the charger and\or charging time, and proper discharge. If you have the money and the time, go for 16 and enjoy the increased speed. If you want to save a little money, go with 12. Most good budget chargers will fit well with a 12 cell set up.

I have yet to see an outdrive perform well\efficiently at this speed, although it should be one of the last things replaced. Wait and see how it runs as you increase the speed.

[Andrew Gilchrist]

Harry

please dont retire!

Andy - mentioned something important the charger - 16 can be harged in 2x8 on an 8 cell charger

I should clear up the 16 cell rec. This is made if you are using the boat for sport

the CP1700's are a very cheap cell - less expensive than 2400's but the 16 cell pack weighs the same and the higher voltage can be used or more rpm and power but with a smaller prop to keep current down and runtime up

[avalentine]

Yes, Harry don't retire just yet. We'll need to pull more FE'rs in here before anyone considers bowing out.

Good suggestions either way Andrew. I myself find it easier to deal with divisions of 6 rather than 8, discharge trays from car guys, chargers that will handle 12 cell packs, other 6\12 cell boats and no other use for 8 cell packs. To each his own, the idea of more voltage for more speed may be all the attraction needed perhaps. As the cost of "new" cells comes down it may become more attractive for even myself to jump into the fray.

[Dick Crowe]

I'm with you andy, I like the cells in multiple of 6's. But, I sure love 8 cell hydro! And yes, what better way to pick up a little speed then with a few more cells (if sone within reason!) My son's e-maxx is a whole new animal with 2 more cells. That's cheap speed! Don't worry, I have no intentions of swtching hobbies, It just looked like too darn much fun!

See ya,
Dick

[T.S.Davis]

Another multiple of 6 option.

800BBX 14.4volt direct drive
x445
18 gp3300 cells
4 minutes in the mid 30's maybe.
I've seen this one go. Slick cheap setup.

That Systems cat from Batavia belongs to Howard Tucker. He's run that thing on 24 cells. I think he said he got into the 40's on the GPS.

[Steve Vasdekis]

Howard has had this boat many years and he has done many modifications to the boat to help it run smooth and fast. The boat is also a bit hard to work on due to the small hatch and also it's a bit difficult to seal the hatch because all the design lips and bumps. There are other cats that are proven and very user friendly and you will be much happier with. Unless you are a creative builder and like to tinker then I guess the Systems cat would be nice.