Hydro balance

[tharmer]

Here's what someone did to help with that...they added pads to the sponsons to lift the bow out of the water a bit more (and correspondingly lengthened the strut a bit). Sounds counter-intuitive, but the reasoning was to let the boat spill more air.

Might also try an air dam.

[sporthydrofan]

im really frustrated i sanded the sponson and the rear "tabs" it seems to do better at high speeds but then the bow gets so high its starts to blow over at 40 again... i think this boat just is too light over all! i need to go get more sand plus im late for work been up since 7 testing tuning testing... sux!

[Ctonez]

Don't lose heart yet.
I've raced against and examined Darin's boats. I don't think his Bud was 32" long, but it did hop at 40+. It is a tricky hull to get the CG/ride right for sure. I know with the Elam he has added weight on the forward wing to try to get it right, and a WIDE variety of props on both boats. He is possible the most thorough tester in our club, and he has spent a ton of time on those 2 hulls. The ProBoat-type hulls are tempermental and sensitive when trying to get them to perform from what I've observed.
I recommend getting a VacuPickle hull and throwing your gear in that. Mostly because it is tough to try a hull that requires as much tuning as an entry into FE. I applaud you persistence with this boat. Every guy on this forum knows your frustration...

[domwilson]

Can you get some video the next time you run it? That would help in troubleshooting your issue.

[ozzie-crawl]

the hull in question has been bugging me the last couple of days i have seen it but cant find out were, i am sure its the same hull as sold by banana hobbys,gfreak etc
could be at its limit at 40 mph

[sporthydrofan]

the hull in question has been bugging me the last couple of days i have seen it but cant find out were, i am sure its the same hull as sold by banana hobbys,gfreak etc
could be at its limit at 40 mph

could be but it hops at 25mph ... plus there is the option of weighing the boat down so it wont blow over...there is a solution i just don't know what...

[sporthydrofan]

Can you get some video the next time you run it? That would help in troubleshooting your issue.

yes! that would be great ill set up a youtube account and take some video...

[Gary]

Here is the same boat or at least looks just like yours sporthydrofan. It has a 8 xl, turnigy 120, 5 and 6s and a x442 prop.Only a couple ounces added to front. This boat has never blown over. Its not that stable this fast, on 6s, but is dead smooth on 5s so what your trying to do can be done.Stay happy......... you will find the problem soon enough.....we always do with some help from friends here! Here is 6s.... http://www.youtube.com/watch?v=OJrgQ99D-4s And here is 5s...... http://www.youtube.com/watch?v=D03K_1rqUKU Boat has come a long way since these videos and NEVER disapoints me. Trust me if I can do it........ANYONE CAN. LOL

[blackcat26]

I didn't notice if anyone had asked about his turn fin yet. Do you have one that is hooked downward and to the port side? That may make it more run smoother. Could possibly hurt max. top speed but might help the bouncing. Having the sponsons foam filled might help also. That adds some rigidity to the whole boat and will help with the hull flexing which hurts speed also.

[blackcat26]

One more thing I was thinking about is your canopy. I'd try and put a good stiff piece of carbon fiber or something to cover up the gap for the "intake". That thing is gonna be grabbing some serious wind at speed, deff. causing the bow to lift.

[Gary]

blackcat26 i found no changes in speed when i blocked off the front canapy. It does help when you crash because it doesnt catch the water and pull off.

[blackcat26]

I was more concerned with the lift effect that the "big pocket" would create more than the speed. It may not make a huge difference but should help.

[sporthydrofan]

I was more concerned with the lift effect that the "big pocket" would create more than the speed. It may not make a huge difference but should help.

that pocket on the cowl is actually blocked by a black piece of wood epoxied in there. i am cutting a piece of carbon fiber vinyl and sticking it in there looks great!

Good news!! i completely fixed the hopping! couple of issues fixed, from talking to numerous people on here and looking at everyones responses..

1. the turn fin was straight.... I put it in a vice and gave it a 20 degree bend inwards towards the hull about 1.5 inches down... result turns great and probably helps keeps the bow from hopping at higher speeds..

2. adjust the AoA to about 3.5 degrees.. that seems to be the general consensus...

3. dumped a whole can of crack filling expanding foam into the sponsons added about 1lb to the front. in my opinion the boat was too light.. cog is about 1.5 inches from the sponson transom.

over all results the boat has a slight hop at slow speeds of 15-30 mph then planes out and hugs the water as it reaches 40 mph... I think the turn fin helps stabilize that bow... i didnt get to radar it but it looks as if its getting 45-50 mph right now and i was doing laps at about 80% throttle even in the turns!

now i have another issue... i keep blowing the esc! i had 2 of them a 90a hobbywing seaking that toasted and majic smoked while testing the hops and just blew a 120 amp seaking after about 5 minutes of laps at 80% throttle the capacitors just bulged and cracked open and leaked out yellow fluid.... i get very good water flow it shoots out at least 6 inches before it hits the water.... the capacitors keep bulging and then bust open and the esc fails...

my setup incase anyone forgot

feigao 580l motor ~2400kv
hobbywing seaking 120 esc
5S1P 5 amp
octura x640 prop

why does the esc's keep failing after such little use? and what do you recomend that will take the abuse without spending over $100 .... Id hate to test out a $200+ esc and blow it...

some last advice from you guys you have been really helpfull so far! and im very happy I became a member on this forum!

[ozzie-crawl]

well first of we need to know what motor you actually have not saying there isn't such a thing but i haven't heard of a feigao 580l in a 2400kv.
if there is such a thing 5s is way to much volts, on FE calc which isn't super accurate but give you a idea shows 175 amps with a 580 6l 2154kv on 5s.
if you can tell what your motor kv is will give a better idea,its fairly obvious the esc is to small or you volts just to high or wrong prop or to long a run time or all 4
plus esc,s don't like partial throttle for very long.
if you have kept the cooling plates from your blown esc you could try a mystery 200 amp and add a cooling plate.

[sporthydrofan]

ok i looked it up it is the 2154 the highest kv on himodel, I dont know why i said 2400 where is this FE calc... id like to have it if its free..