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-   -   Airboat spoiler ? (https://www.rcuniverse.com/forum/rc-airboats-246/7867524-airboat-spoiler.html)

bayward 08-20-2008 06:05 PM

Airboat spoiler ?
 
Who has experimented with a spoiler on the front of their airboat to keep the bow down at high speed ?

How about that spoiler being computer radio mixed in with the throttle ? So the spoiler would proportionately produce more down pressure on the bow as the speed increased.

Bob

kokker 08-21-2008 06:15 AM

RE: Airboat spoiler ?
 
hey
i havent tryed spoiler in the front but i have made 2 boats with RC controled spoilers at the back.

but i found another solution that works better,
i dont know if your problem is the same as my own, but my problem where when my boat started to pick up speed the bow got unstable,
on my latest boat i made an 5mm deep 4cm wide cut in the buttom of the hull and made an spoiler like shape, this forces the backend of the boat up when the boat picksup speed and keeps the bow steady
i can upload a picture if you like :)

/Jacob

mjderstine 08-21-2008 08:31 AM

RE: Airboat spoiler ?
 
I'C LOVE TO SEE A PIC OF THAT MODIFICATION.

bayward 08-21-2008 10:02 AM

RE: Airboat spoiler ?
 


ORIGINAL: kokker
i can upload a picture if you like :)
I would like to see the picture also.

Bob

kokker 08-21-2008 10:45 AM

RE: Airboat spoiler ?
 
Ok the finish issent that grate, i mixed the wrong hardner in the gellcoade, so it took 3 month to harden and still it wasent a good result.....
besids that it sails ok :)

that first cut :)
http://images.rcgalleri.dk/uploads_a...wm/75278_l.jpg

after the cut where sanded and filled
http://images.rcgalleri.dk/uploads_a...wm/75952_l.jpg

Another angel
http://images.rcgalleri.dk/uploads_a...wm/75953_l.jpg

And the end result :)
http://images.rcgalleri.dk/uploads_a...wm/75951_l.jpg

mjderstine 08-21-2008 12:13 PM

RE: Airboat spoiler ?
 
hmmm, not what i expected but pretty cool.

the mixed spoiler would be almost unnessecary though. as speed increases, so does down force from the spoiler. F1 race cars create so much downforce at 200mph they can drive upside down.

think about it...

asmithnc 08-21-2008 01:23 PM

RE: Airboat spoiler ?
 


ORIGINAL: bayward

Who has experimented with a spoiler on the front of their airboat to keep the bow down at high speed ?

How about that spoiler being computer radio mixed in with the throttle ? So the spoiler would proportionately produce more down pressure on the bow as the speed increased.

Bob
It has been done but I belive it's not the proper fix. Most of my flat bottoms have fliped at one time or another. It usally happened a higher speeds and quickly comming off the throttle. This make the bow light and a back flip will occur. My fix..... Adjust the cg by moving weight.

I would start with the engine since it's the heaviest added piece. I built many adjustment holes in my engine stand so the cg could be moved around.
http://img.photobucket.com/albums/v6...4/100_2592.jpg

asmithnc 08-21-2008 01:31 PM

RE: Airboat spoiler ?
 
1 Attachment(s)
This has to be one of the coolest spoiler mods todate. Once the bow becomes (light) Less pressure on the skies make the spolier rise.

kokker 08-21-2008 02:30 PM

RE: Airboat spoiler ?
 
woulden it be posibal to make somthing simelar with an gyro and a servo ?
another thing, when adding an spoiler dosent the boat get more contact with the wather and gets slower ? or am i off there ?

one thing i can say for shure spiolers in the back is a wary hard balance act, i where over in mixing in an OOpic board to get it right, but skipped the spoilers all togther,
but i think if one can work out how the downforce should be at any given moment, you will end up with an boat that handles better and can do higher speeds stable :)

/Jacob

mr. ilikehelp 08-21-2008 07:16 PM

RE: Airboat spoiler ?
 
i moved my moter forward to stop the front from having light handling

jasperrc 08-27-2008 07:28 AM

RE: Airboat spoiler ?
 
1 Attachment(s)
I used a spoiler on an old flatbottom. It didn't look very good, but it allowed the boat to go wide open without flipping. The real problem was that the boat was just too wide and caught the air too easily.

I have since built other boats that are much narrower and do not have flipping problems at WOT.


dadkins 08-29-2008 04:24 PM

RE: Airboat spoiler ?
 
1 Attachment(s)
I have had good luck with putting spiolers on my last three boats - It does tend to slow them down a very little -but way less tendency to do the high speed loop. The spoiler in the pictures was off a rc truck and was a little heavier and less effective than a wing I made.


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