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adding a os .21 rg-mx to a vegas

Old 08-28-2006, 04:30 PM
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dirtysouth31
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Default adding a os .21 rg-mx to a vegas

anybody else tackled this yet and any pictures would be nice? do you have to go to the 3/16 drive cable and id so would the octura 1440 be a good prop for the vegas. and do you have to change the tuned pipe to make this engine scream? i was told the stock pipe would restrict the motor down and not get all it should!i saw a strut on aeromarine made for .21 hydro for 3/16 also i tried the flex cable and it wont fit
Old 08-28-2006, 05:53 PM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas

A 21 size engine will not fit in the stock Vegas motor mounts.

I installed an O.S. 21 VZM in a Miss Vegas it it takes some amount of "re-engineering:"
1. New motor mount rails.
2. New motor mount.
3. New 3/16" drive flex drive.
4. New tuned exhaust system.
5. Rework the front of the boat for a bigger fuel tank.

Russ Williamson, AquaCraft Product Manager, presently has this boat and is racing it in 20 Sport Hydro.

JD
Old 08-28-2006, 05:56 PM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas

Here's some photos of the Miss Vegas with an O.S. Max VZM. I forgot to mention it needs a new strut as well. The Vegas rudder does work.

JD
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Old 08-28-2006, 06:49 PM
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1outlaw
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Default RE: adding a os .21 rg-mx to a vegas

Jerry whats the speed gained doing that???.....Looks interesting....Im considering buying another vegas to modify heavily but not sure it will do what i want it too......Like the boat to be in the 50's for sure...
Old 08-28-2006, 06:58 PM
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dirtysouth31
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Default RE: adding a os .21 rg-mx to a vegas

whats a good tuned pipe for the .21?i saw in intlwaters you said you had at that time an andy brown 3.5 muffled pipe.is there one on web that u would recomend and how about prop? i picked up a oct 1440 for hydro saying between the 1440 and 1445 would be the best for it
Old 08-28-2006, 10:06 PM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: dirtysouth31

whats a good tuned pipe for the .21?i saw in intlwaters you said you had at that time an andy brown 3.5 muffled pipe.is there one on web that u would recomend and how about prop? i picked up a oct 1440 for hydro saying between the 1440 and 1445 would be the best for it
I like the Andy Brown 3.5 quiet pipe. I was running an Octura X437/3 on the boat before Russ acquired it. I never had the boat on radar. Russ said he thinks it's getting close to 50.

JD
Old 08-29-2006, 06:27 AM
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Default RE: adding a os .21 rg-mx to a vegas

For those reading, the source for the Andy Brown pipes is: http://www.cmdracing.com/ . I use his pipes on my Sport 40, 40 mono, and .80 Sprintcat. They work great! While you're there, take a look at the gallery, he's got photos of some really nice boats. G&M Hobbies also carries Andy's pipes.

Jerry, think there'd be any problems fitting a Mac .21 outboard that's been converted to inboard in the Vegas? I'll be using a CMB wrap around header. Also, any ideas on a good starting pipe length for dirtysouth31?
Old 08-29-2006, 10:01 AM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: piper_chuck

For those reading, the source for the Andy Brown pipes is: http://www.cmdracing.com/ . I use his pipes on my Sport 40, 40 mono, and .80 Sprintcat. They work great! While you're there, take a look at the gallery, he's got photos of some really nice boats. G&M Hobbies also carries Andy's pipes.

Jerry, think there'd be any problems fitting a Mac .21 outboard that's been converted to inboard in the Vegas? I'll be using a CMB wrap around header. Also, any ideas on a good starting pipe length for dirtysouth31?
The MAC would fit into the boat just like my O.S. VZM did. Measuring from the back of the engine case to the weld on my Andy Brown 3.5 quiet pipe, the distance is 8 1/2 down the center of the header/pipe.

JD
Old 08-30-2006, 03:03 PM
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: Jerry Dunlap

A 21 size engine will not fit in the stock Vegas motor mounts.

I installed an O.S. 21 VZM in a Miss Vegas it it takes some amount of "re-engineering:"
1. New motor mount rails.
2. New motor mount.
3. New 3/16" drive flex drive.
4. New tuned exhaust system.
5. Rework the front of the boat for a bigger fuel tank.

Russ Williamson, AquaCraft Product Manager, presently has this boat and is racing it in 20 Sport Hydro.

JD
Hey JD,
Are you using this collet or the same dimensions for the O.S. 21 engine. I'm assuming they use the same crank threads for the VZM and RG-M.

http://www2.towerhobbies.com/cgi-bin...9&I=LXDP84&P=K

Thanks
Ryan
Old 08-30-2006, 03:39 PM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: ryan_t888


ORIGINAL: Jerry Dunlap

A 21 size engine will not fit in the stock Vegas motor mounts.

I installed an O.S. 21 VZM in a Miss Vegas it it takes some amount of "re-engineering:"
1. New motor mount rails.
2. New motor mount.
3. New 3/16" drive flex drive.
4. New tuned exhaust system.
5. Rework the front of the boat for a bigger fuel tank.

Russ Williamson, AquaCraft Product Manager, presently has this boat and is racing it in 20 Sport Hydro.

JD
Hey JD,
Are you using this collet or the same dimensions for the O.S. 21 engine. I'm assuming they use the same crank threads for the VZM and RG-M.

http://www2.towerhobbies.com/cgi-bin...9&I=LXDP84&P=K

Thanks
Ryan
That collet works well.

JD
Old 08-30-2006, 08:08 PM
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dirtysouth31
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Default RE: adding a os .21 rg-mx to a vegas

okay i have everything i need except a clue on how to mount motor.from the pictures it looks like wood stringers! did you make or buy them and epoxy them in??
Old 08-30-2006, 08:20 PM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: dirtysouth31

okay i have everything i need except a clue on how to mount motor.from the pictures it looks like wood stringers! did you make or buy them and epoxy them in??
The stringers were made from 1/2" plywood and then glued to the bottom of the hull with epoxy. The motor mount is a Speed Master mount.

JD
Old 08-30-2006, 09:01 PM
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Default RE: adding a os .21 rg-mx to a vegas

okay my add is working overtime[X(]jerry the .21 rg-mx is rated at 1.7 at 28,000 rpm and ways around 14,the .18 cvr is 1.3 at 28,000rpm and ways about 6 less than 21.for practical reasons wouldnt it be around the same thing just going with .18.considering the amount of weight you have to add to make .21 work,and the .18 just bolts right in with no mods or changing running gear?i am torn with what to do?[:@]
Old 08-30-2006, 10:50 PM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: dirtysouth31

okay my add is working overtime[X(]jerry the .21 rg-mx is rated at 1.7 at 28,000 rpm and ways around 14,the .18 cvr is 1.3 at 28,000rpm and ways about 6 less than 21.for practical reasons wouldnt it be around the same thing just going with .18.considering the amount of weight you have to add to make .21 work,and the .18 just bolts right in with no mods or changing running gear?i am torn with what to do?[:@]
Installing the O.S. 21 VZM in the Miss Vegas hull is not something I'd recommend for anyone with limited experience in setting up a hydroplane. It took me a while to "get 'er done" and I've done many setups over the years.

Easiest route is to get the .18 CVR and look into upgrading the tuned exhaust system.

JD
Old 08-31-2006, 10:41 AM
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Default RE: adding a os .21 rg-mx to a vegas

If you haven't bought that OS .21 RG-MX you better do so quickly. I think OS is phasing out the .21 RG line. I had been planning on purchasing the .21 RG Buggy sport for a while now and noticed it listed as limited quantities on Tower Hobbies web page. Today it's listed as discontinued along with the .21 RG P Buggy sport. The only difference between the .21 RG buggy engines and the .21 RG marine engines is the head and carb. The case and all the internal parts are the same. It would seem like a logical conclusion that the .21 RG marine engines are next.

Steve
Old 08-31-2006, 02:08 PM
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Default RE: adding a os .21 rg-mx to a vegas

it arrived today but im just going to send back for the .18 cvr.i think that they are roughly the same when you consider all the weight you are adding on the to make the .21 work,i think i would be better off with the .18.i think the one jerry has can move that weight and see a big difference.1.7 or 2.5hp?the .18 is 1.35hp i think between what you add that little difference wont be a good difference
Old 10-01-2006, 09:03 AM
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Default RE: adding a os .21 rg-mx to a vegas

Jerry (Dunny?),
I am putting a 21 in my second Miss Vegas hull as my winter project. I want to end up with a competitive Sport 20 (that at least looks like a RTR Miss Vegas). I am looking at a Ross Piranha (at least the advertised hp ratings are awesome). Any thoughts or ideas?

BTW, I talked to Rod Geraghty the other day about modifying the 18 and he said I should call you but I didn't want to bother you.
Old 10-01-2006, 10:04 AM
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: piper_chuck

While you're there, take a look at the gallery, he's got photos of some really nice boats.
you mean there is boats in those pictures? [:-]
Old 10-01-2006, 11:24 AM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: 007clint

Jerry (Dunny?),
I am putting a 21 in my second Miss Vegas hull as my winter project. I want to end up with a competitive Sport 20 (that at least looks like a RTR Miss Vegas). I am looking at a Ross Piranha (at least the advertised hp ratings are awesome). Any thoughts or ideas?

BTW, I talked to Rod Geraghty the other day about modifying the 18 and he said I should call you but I didn't want to bother you.
Advertised hp ratings are just that - advertised. I suggest you have Rod make an engine recommendation. The Miss Vegas is of sufficient size to handle a 21. However, it takes some reworking of the drive system, engine mounts, fuel tanks, and strut.

JD
Old 10-01-2006, 05:11 PM
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Default RE: adding a os .21 rg-mx to a vegas

ORIGINAL: Believe It


ORIGINAL: piper_chuck

While you're there, take a look at the gallery, he's got photos of some really nice boats.
you mean there is boats in those pictures? [:-]
Yup, if you look at the gallery a couple dozen times, you'll start seeing them!
Old 10-01-2006, 11:23 PM
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Default RE: adding a os .21 rg-mx to a vegas

The Rossi's are nice engines. Mine has done quite well against the CMB's and MAC's. They do take a while to get broken in, a good gallon or more of fuel and mine can swing a bigger prop than my old Nova Rossi or a MAC but the MAC cranks out more RPM with a smaller prop. When I sneezed my Nova Rossi, I got a good deal on the Rossi and got it quickly as I needed it for an upcoming race. Not enough people run them but those of us that do, love them.
Old 10-02-2006, 09:55 AM
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Default RE: adding a os .21 rg-mx to a vegas

how about just buying the OS .18 TZ and buy the water cooling head from the CVR apart and run off that???? u still get the wieght of a small block engine with the power of a big block and it mounts with out anymods.....only thing ull need is a header
Old 10-02-2006, 09:56 AM
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Default RE: adding a os .21 rg-mx to a vegas

.
Old 10-02-2006, 02:40 PM
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Jerry Dunlap
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Default RE: adding a os .21 rg-mx to a vegas


ORIGINAL: MiamizFinest

how about just buying the OS .18 TZ and buy the water cooling head from the CVR apart and run off that???? u still get the wieght of a small block engine with the power of a big block and it mounts with out anymods.....only thing ull need is a header
Check out the "Miss Vegas Make It Fast" thread. I just posted info and photos on this mod. It really works.

JD
Old 10-12-2006, 06:57 PM
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Default RE: adding a os .21 rg-mx to a vegas

I have a guestion about CG.Is it best measured by weight on the prop or by a location on the hull,and what would you recommend as a starting point.I'm gonna set up one of these 21 hydros.

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