Figuring out what prop to run?

[Joenagy]

I Need some help ................ Not Medical supervised Help. LOL

So Ive got a box full of props and a room full of boats. How to I figure what prop to run? I need some sort of cheat sheet.

Joe

 

[Ray Sametz]

http://www.cmdracing.com/updated/prop_picks.htm

 

[Joenagy]

Thank You

 

[lohring]

That's a great resource. If you are interested in more look at the series of articles on props in the October 2013, April 2014, and March 2015 issues of the NAMBA Propwash.

Lohring Miller

 

[Stephen Ecuyer]

What is the best prop for a HTB 290 with Nova Rossi 21 KEEP outboard

 

[PaulHail]

I find searching intlwaters via google to be a pretty good way to find out tips on props for a given hull.

 

[Alan Elzer]

What is the best prop for a HTB 290 with Nova Rossi 21 KEEP outboard

1440(pitched up & back cut), m440, x442
Sent from my SM-N920V using Tapatalk

 

[shoboat]

Joe, and Others,

With the newer style (Some are 3 years old now) ABC Propellers here are some general ideas for heat racing:

21-Tunnel:

1417, 1419, 1514,1515, 1614

45-Tunnel:

1815, 1817,1915

21-Mono:

1614/3-15*-65% Chopper

Newest 1614/3-15*-60% Cleaver

45-Mono:

1914/3, 2015, 2115, 2116

Sport 40:

1914/3, 2015, 2115, 2116

1/8th Scale:

2315

Newest 2315/3-23*-47

12-Hydro:

1415, 1417, 1419, 1514,1515, 1517, 1519

21-Hydro:

1715,1716, 1717, 1815, 1817, 1914, 1915

45-Hydro:

2117, 2119, 2215, 2217, 2219

67-Hydro:

2417, 2419, 2515, 2517, 2519

90-Hydro:

2617, 2619, 2717, 2719

Twin Hydro:

2717, 2717/3, 2719, 2817,2819

Just a rough ballpark for most of the Nitro classes.

The rake that works well on all of these is a: 19 degree rake and 38% blade area

The three blades are 15 degree rake and either 60% or 65% blade area,

or some newer ones coming out have 47% blade area also.

Thanks For Reading Fellas,

Mark Sholund

 

[Michael Costanzo]

Joe, and Others,

With the newer style (Some are 3 years old now) ABC Propellers here are some general ideas for heat racing:

21-Tunnel:

1417, 1419, 1514,1515

45-Tunnel:

1815, 1817,1915

21-Mono:

1614/3 Chopper Style

Newest 1614/3 Cleaver Style

45-Mono:

1914/3, 2015, 2115

Sport 40:

1914/3, 2015, 2115

1/8th Scale:

2315

Newest 2315/3

12-Hydro:

1415, 1417, 1419, 1514,1515, 1517, 1519

21-Hydro:

1715,1716, 1815, 1817

45-Hydro:

2117,2215, 2217, 2219

67-Hydro:

2515, 2517, 2519

90-Hydro:

2617, 2619, 2717, 2719

Twin Hydro:

2717, 2719, 2817,2819

Just a rough ballpark for most of the Nitro classes.

The rake that works well on all of these is a: 19 degree rake and 38% blade area

The three blades are 15 degree rake and either 60% blade area

or some newer ones coming out soon will have 47% blade area also.

Thanks For Reading Fellas,

Mark Sholund

hi mark, maybe you could give a little insight in trying to compare RAKE and BLADE AREA between prop makers...like i run a lot of Prather props.so when i look at the ABC prop chart i have sort of an idea of how to compare the two.thanks,mike.

 

[shoboat]

Mike,

Prather or Octura do not use Blade Area Ratio or Rake angles like ABC.

You get what you pay for. You can calculate it if you have a bunch of

time on your hands Mike? ABC Propellers are designed with an expensive

software package that allows Jim to make whatever design he wants too.

Compare with diameter and pitch ratio and you will be pretty close. Prather

is mostly a 1.5 pitch ratio, and Octura has many to choose from.

Enjoy The Weekend,

Mark Sholund

 

[Michael Costanzo]

Mike,

Prather or Octura do not use Blade Area Ratio or Rake angles like ABC.

You get what you pay for. You can calculate it if you have a bunch of

time on your hands Mike? ABC Propellers are designed with an expensive

software package that allows Jim to make whatever design he wants too.

Compare with diameter and pitch ratio and you will be pretty close. Prather

is mostly a 1.5 pitch ratio, and Octura has many to choose from.

Enjoy The Weekend,

Mark Sholund

hi mark,thank you for the reply. i am using the Dia/Pitch method now and that is what i will stick to.have a great weekend also,mike.

 

[Terry Micallef]

Any thoughts on the correct prop for a Zelos G 48? Motor is a stock 30cc. Running a Zipps super tuned pipe. Only turning 45mph with a Prather 275.

 

[Alan Elzer]

What is the best prop for a HTB 290 with Nova Rossi 21 KEEP outboard

1440 pitched 3.2 & little cup is hard to beat. Or 1515, 1516's

 

[Mark Anderson]

1440 pitched 3.2 & little cup is hard to beat. Or 1515, 1516's[/QUOTE

Alan is right, the good old 1440 back cut and pitched to suit is very hard to beat for a 20 tunnel. Stock or Mod.

 

[Dennis Somers]

Terry, get in touch with Bob English @ [email protected] and try an ABC 2714-15-50 (2), or an ABC 2716-15-50 (2). Bob thins, sharpens, and balances these props for $50 and ships for $5.

There are a few other simple things you can do for more speed on that boat. Don't use a velocity stack on the carb. Shorten your Zipp pipe up on the header as much as you can without it leaking at the header bend. And YOU MUST provide a lot of air into and out of, that sealed hatch. Gas motors suck a lot of air and the enclosed pipe heats and expands that air. Get fresh/cool air IN and hot air OUT.

And stuff the hull with pool noodles, and glue some floatation under the hatch.

 

[Terry Micallef]

I believe after today I am on the right track. Our club's engine builder finished the mods on my stock motor so that along with Dennis's helpful suggestions pushed this Cat to 65.1 mph today! Bob English did a great job with this 2714/15 that he sent me.

 

[Terry Micallef]

Stock motor mods...piston is modified and lightened, the transfer ports are reshaped and bigger, the intake port and the exhaust port is bigger and retimed, the squish is set and burn chamber is larger, the crank is trued and the carb is modified to. 20 mph gain. Thank you Steve! (SS Racing)

 

[Terry Micallef]

SS Racing motor pics

 

[Terry Micallef]

Got my tach mounted today.