Vortex34 Hyper Sport Hydro

[Fluid]

My old Aeromarine Sport 21 hull weighed 10.5 lbs ready to go - with 4S2P/5000. It was a winner in rough water.

Still a couple weeks out on my Vortex 34...


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[properchopper]

Well my conclusion on mine is that the sponsons are all wrong. Way to much angle of attack. Over 50 she waddles like or duck. Very unstable. I am in the process of changing the bottom sponsons. Will update how it she runs.


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Agreed. Like the rtr UL-1, too much AoA. Same when I did a FE conversion to a Miss Vegas V1 which was a nitro rtr with a .21. When the Vegas Deuce replaced it with a .18 (or .19?) Proboat increased the AoA to keep speeds up with less power. Those that duplicated my FE MV with the Deuce encountered the instability situation created by too much AoA and couldn't figure out why mine was stable at warp speed and theirs weren't.

I had a feeling that the Vortex34 would have the same issues (enhanced by the full length air traps). It's AoA is NOT optimum for available P-Sport Hydro lap speeds (nor is the lift potential created by the big armpits & air traps). And H, like we talked about on the phone, mine commenced to do the "Chuck Berry" after 50mph or so. I've re-adjusted strut depth and moved the CG forward as much as allowable given the layout & will re-test as time allows. Then I'll give some thought to surgery but not yet. (Been talkin' to Jay and He's in the Vortex loop also prepping one for the Straightlines this fall. )

[Fluid]

Uh, not for the SAWs Tony, sorry if I wasn't clear. It will be a heat racing boat for rough Texas racing. One in the club already does okay, oddly with no sponson dance. It will blow over though.

To hit 100 mph in P Sport the Vortex 34 would need the traps cut off, etc. Easier to cut 3" off the transom of my Q Sport SAW hydro and make it a P...


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[properchopper]

Uh, not for the SAWs Tony, sorry if I wasn't clear. It will be a heat racing boat for rough Texas racing. One in the club already does okay, oddly with no sponson dance. It will blow over though.

To hit 100 mph in P Sport the Vortex 34 would need the traps cut off, etc. Easier to cut 3" off the transom of my Q Sport SAW hydro and make it a P...


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OOps, Sorry Sir ... darn dain bramage got me cornfused again........

[photohoward1]

Surgery has commenced. Opened up the arm pits and redirected the air flow like Tony's UL1. Now working on this sponsons to adding some ride pass to lower that angle of attack. If I can fix it or will be awesome. BTW. O KNOW MINEOS 10 plus pounds. I'm running a lehner 2250 can. 2350 rpm/v. 10k 4s. Way to much power.


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[properchopper]

UPDATE : Major Progress

Finally found some time. At the next to the last visit to the lake with the tap-dance still occurring I had two well-known IC guys observe. One said the outside sponson lifted when throttled, and the other commented (verbatum) " You FE guys ALWAYS run your struts TOO FAR UP"

So here's what was changed:

#1: Added ballast in the LF sponson tip

#2: Lowered the strut WAY down & a tad negative to lift the rear (effectively reducing the AoA up front)

DSC07725.JPG


#3: Changed from a 452/2 to a 450/3 for less torque roll

#4: Added an el-bigggie air dam made of dense rubber

DSC07721.JPG


During a midday break at the last SAW I ran it.

Result : No more Macarena, no blowover or sponson lift in spite of the mid-day wind on the course. Yay ; didn't really want to molest the sponsons One tiny mistake was that, in violation of a most important pit rule I connected only one battery by accident while a local chatted me up so the run was made on 1P Roaringtop 4S 70C 5000 instead of both batteries. Boat might have gone a tad faster with both batteries and could possibly get dance-y but I doubt it. I was very satisfied with how it did while cranking some WOT ovals.

My first intention was to do this build for the Mag article, then put it up for sale since we don't race P-Sport here. I just wanted to get the kinks ironed out first, but the boat is so impressive on the water that I'll likely hang on to it for now

Added rear fins to aid in lateral stability at speeds over 200mph

DSC07718.JPG

[Fluid]

Tony, you should have asked. I've been running my strut C/L almost 1-1/2" below the hull bottom, and a 1/2" airdam across the front of the tunnel. Put 4 oz of lead in the left sponson tip. With an ABC 2015/17* it rips and is planted. But next I'll have to try the rear fins......



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[LarrysDrifter]

I just bought one of these hulls.
Tony or Jay....where exactly does the turn fin get mounted? At the edge of the flat sponson or farther out? I noticed there's a flat and there's an angled part of the sponson next to the flat part. Also, my hull has an angled line scribed on the sponson transom where the fin mounts. I wouldn't think a fin would get mounted at an angle like that....
Any advice?
I'm using an FE30 fin and bracket.

[properchopper]

Tony, you should have asked. I've been running my strut C/L almost 1-1/2" below the hull bottom, and a 1/2" airdam across the front of the tunnel. Put 4 oz of lead in the left sponson tip. With an ABC 2015/17* it rips and is planted. But next I'll have to try the rear fins......



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Yup !

I'm pretty much on the same page. Didn't have time to try other props. Will soon. If you listen carefully the rear fins actually go Zoom-Zoom as you approach Mach I (The shock wave while punching through might loosen the sticky tape 'tho)

[properchopper]

I just bought one of these hulls.
Tony or Jay....where exactly does the turn fin get mounted? At the edge of the flat sponson or farther out? I noticed there's a flat and there's an angled part of the sponson next to the flat part. Also, my hull has an angled line scribed on the sponson transom where the fin mounts. I wouldn't think a fin would get mounted at an angle like that....
Any advice?
I'm using an FE30 fin and bracket.

Hi Larry,

This may help. I just did what seemed reasonable on the V34 using a rather large Insane Gas/Nitro bracket (and had to grind the bracket smaller to get it to fit). Figured the heavy weight of the boat RtR would need some substantial holding power at WOT in the turn.

Here's an FE30 bracket on an FE30

DSC07731.JPG

Here's the Insane Nitro/Gas bracket on the V34 :

DSC07733.JPG

[Brushless55]

Great job Tony!
tell us again your power setup if you don't mind

[Fluid]

Larry, my fin is in line with the sponson bottom chine like Tony did. I shimmed mine so it is parallel to the hull centerline and bedded it with JB Weld. This is a pretty big boat, the FE30 fin may be on the small side as Tomy points out.


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[properchopper]

Great job Tony!
tell us again your power setup if you don't mind

Todd,

I just HAD to try out the TP Power 2200KV 4070 - 40mm x 100mm !!! The Swordfish 240 seemed like the right ESC to mate it to. Both are HUGE !!!

[LarrysDrifter]

Thank you both for the pointers.

[Brushless55]

Todd,

I just HAD to try out the TP Power 2200KV 4070 - 40mm x 100mm !!! The Swordfish 240 seemed like the right ESC to mate it to. Both are HUGE !!!

Thanks Tony,
Sounds like a real powerhouse!