New Electric Rigger

[gerardobrandao]

Hello Guys....


I´m still for the loss of mine boat, but can´t loose the wave or i will "sink"


I´m going to develop mine rigger to use a Leopard 5692 2Y 1090Kv with 8S2P 5300mah cells.....
I´m hopping 75 to 80mph.....Oval, not SAW....It is attainable with a well designed rigger?
Prop suggestions..!!!??


Best Regards

[siberianhusky]

Yes with a well designed boat, no unless you have a lot of experience with riggers and know what you are trying to improve upon with existing designs.
Don't know how much experience you have with riggers but they are not a simple as a 2x4 with skis, they are the formula1 of the rc boat world and are just as unforgiving in set up as the cars.
I have yet to see a good rigger design that didn't build on a lot of experience and trial and error.
A gas boater I know is on his third hull mould/design and unknown number of sponson designs trying to set some saw record, each of the previous boats were full carbon fiber jobs vacuum bagged etc. Not cheap failures! (Bought my VS-1 from him)
If it were me I'd start with a known boat design run it and then make improvements on that based on what I thought it needed. Then again a good known boat design could run those speeds anyway.
Best of luck, always like seeing new projects.

[gerardobrandao]

Considering that the SAW World Record boat in "*" class was designed by me... i think i feel comfortable designing it.... :D

Oval boats are a different way...and would need input and help....

I think that leopard 5692 would make me 80mph.... Mine opinion..

Bu wait for others inputs...

Best Regards All

[gerardobrandao]

Considering that the SAW World Record boat in "*" class was designed by me... i think i feel comfortable designing it.... :D

Oval boats are a different way...and would need input and help....

I think that leopard 5692 would make me 80mph.... Mine opinion..



Best Regards All

I´m a humble persion..don´t take to the "dark side of the force" mine affirmation "i think i feel comfortable designing it" just to say that i have basics of what i´m designing..

Bu wait for others inputs...

[siberianhusky]

LOL sounds like you have the background! a lot of people look at riggers and think there is nothing to designing and building one!
Take a look at the JAE sponson design, plans are available freely, many people are adapting this type of design to different tubs with success.
Another good design is the KEPS rigger from europe, very similar design. Worth a look for another heat racing boat design.

[eric_laermans]

Riggers are easy to build and forgiving. Very fast competition riggers need a lot of knowledge as it is all about the right proportions: motor, ESC, LiPo, tub, floaters, turnfin, rudder and placement of these components. There are a lot of tradeoffs to reckon with.

[TINY]

Excuse my question if it comes across the wrong way but why are you investing alot of time and energy into an 8s rigger for oval running a leopard??? No offence to leopard but they are hardly top end?? They do have a place of course..
They quote high efficientcy but with your substantial experience why not run a lehner or similar and be done with it?? I only ask because i've had experience with both in the same setups with substantial differences. Not that i've used a 5692 before...

Just curious...

Cheers

[eric_laermans]

Can you tell any difference between the speed in this footage:

And this footage:

First is LPB 2850 2.5d and second is LMT 1535/5, the LMT has 5mm longer can-length.

[gerardobrandao]

Excuse my question if it comes across the wrong way but why are you investing alot of time and energy into an 8s rigger for oval running a leopard??? No offence to leopard but they are hardly top end?? They do have a place of course..
They quote high efficientcy but with your substantial experience why not run a lehner or similar and be done with it?? I only ask because i've had experience with both in the same setups with substantial differences. Not that i've used a 5692 before...
Cheers

Hello Tiny


I know that i would be better served with a Neu 2215 or a lehner 3040 or 3060, but i have this new motor laying around and want to give him a try.....its comparable with a NEU 2215 but with less 5 or 8% efficiency..i´m not going to compete with him..... either ways thanks for your input
Just curious...

[TINY]

Hello Tiny


I know that i would be better served with a Neu 2215 or a lehner 3040 or 3060, but i have this new motor laying around and want to give him a try.....its comparable with a NEU 2215 but with less 5 or 8% efficiency..i´m not going to compete with him..... either ways thanks for your input
Just curious...

Cheers no worries, if i had one laying around i'd want to see what it could do.. Have fun

[TINY]

Can you tell any difference between the speed in this footage:

And this footage:

First is LPB 2850 2.5d and second is LMT 1535/5, the LMT has 5mm longer can-length.

Yeah just let me jump into the tardis and install a gps when your not looking???? Point of post?? Your laps weren't consistent to time via stopwatch utube and computer screen... sorry

Went pretty well in both, liked the bank hugging in vid 1, ...nice work

[gerardobrandao]

Hello Guys




I´m thinking something like this....43 inch long for 8S2P Gens ace 5300mah 30C cells.....

Mine question is:

Should i use back sponsons or a unique "ski" sponson...what are advantages od wich one?


Waiting for input...


Where´s just an appointement photo

8S Rigger.jpg

[Meniscus]

Most of the time rear sponsons or skis are not necessary. What they do is provide a planing surface to help keep the prop on the surface of the water either during takeoff, to avoid cavitation, or through the turns to keep the prop from bogging down. Sometimes they are used to overcome extra weight on the tail where the lift of the prop cannot overcome. Other times they are used on lower voltage setups to allow for a small prop and reduce the load put on the electronics.

Hopefully this helps. Most of us that have used them usually put them on with double sided tape. Then we can move around or remove all together depending on our intended result. Also note that these rear sponsons are used extensively in nitro racing to keep the motor from bogging down and stalling due to the cavitation. When they launch, they are revved up and with the implemented rear sponsons, it helps keep their RPMs up.

[Meniscus]

With regards to your original question, a 1090kv motor, 29.6V, you will get around 60mph with an Octura X645 once tuned. To do 75mph, you'd have to run an Oct. X465 or 1657. With that much prop, you may be asking a lot from the Leopard motors, but I am not as familiar with what they will do under higher voltages. I'll let someone else weigh in there. Perhaps the thing to look at is what is the total max wattage is for the Leopard motors, then calculate from there.

[martin]

Do either rear sponsons or centre ski cause more drag at top speed than not have either, its just that ive noticed on several vids with JAE boats with the ski their appears to be a lot of spray coming from the ski. These are not boats that are not set up wrong & running badly, i also have a JAE Mini Sprint that runs around 50mph & i run it quite loose but it still looks like theirs drag & spray coming from the ski Martin.