The Evil Twin 90 SGX

[ace]

Hi Charlie ,I run the cocr props II1 on my twin love em , but watching your twin with those so called game changers didn't impress me sounded like one engine was off a bit to , liked the look of the the rooster tail though nice an low ,to me they needed some more pitch in them as they were loading in the turns but not in the straight as it was going rich. I am currently running some new gold head evos 90s with II1s if i can work out Ill post a video for you the engines are not quite right as just getting bowl size right an need to do a few more mods but am slowly dialling it in the props have been pitched not cupped ,I am going to try the +5 in a few weeks when Peter gets to them for me anyway Charlie good to see ya blasting around again ,Ace

,

 

[ace]

Charlie here is that video Cheers Ace

 

[ace]

Bloody try again

 

[dwilfong]

you need to get CUP out of your head with the new ABC props..................................................

It dose nothing for speed with this prop.

Spent some time last night showing Julian what I meant with the props we tested on his 45 twin.

4.08 lead in pitch, 4.14 overall average on the whole blade and 4.32 trialing edge .

The lead in was checked with 15 deg of rotation and the TE was checked at 5 deg from the trailing edge.

So that's 4.32 CUP.........................

This prop worked killer and had more speed than a cupped up prop.

You want to run on the true pitch as I call it LE.

This is how you load the eng NOT CUP................

The progression of the prop dose not need to be huge with a light on the water rigger.

Less progression as in lower cup will make more speed.

Even on a 1667 6.2 cup is a lot of cup.

Those that now the 1667 like the back of there hand know that the last 30% of the diameter is all it runs on and working this just the right way will make speed. But there only a few know this and it takes lots of work to do it to a prop.

The new ABC props only need the trailing edge worked to get it tune in.

There are many different diameters and pitch ratios in the same blade design. This makes tuning a breeze if you work the trailing edge.

So take all you have learned about cup and throw it out the window....................................

It's only a new game if you play it different.................................

 

[shoboat]

David,

Was that the 2319-19-38% set? If so,

It has more leading edge pitch in it with the 1.9 pitch ratio.

These are pretty fast propellers, but for heat racing the

1.7 pitch ratio with a shorter pipe may be a better set up for some?

We are having some pretty good speed and handing with

the 2315-17-45% propeller on a 45-Hydro. Some motor and

pipe combinations like a little more blade area. I think Charlie's

twin is possibly in the same situation. The 2819-19-38% is a really

fast propeller if you can slow it down and get back up with it. Your

Orlic gauge measures quite a bit different than a Steve Wood gauge,

but you can arrive with good numbers with both gauges.

Thanks,

Mark Sholund

 

[dwilfong]

Mark yes that was the 2319-19-38

It still had just a little lag from a dead crawl but not much.

Taking the TE cup out woke this prop up big time..................................

I will; be testing the 2517-19-38 and the 2519-19-38 here soon on Ed's SG .80 boat.

The 2717 is working good on Raul's twin RR .91 RS EVO boat thy are just sharpened and balanced from what I was told.

The boost pitch is all that needs to be adjusted on the new props. leave the rest alone......................

I think I may spend the time here soon and build a spread sheet to use with the Orlic style gauge.

This way you can map the whole prop and see the pitch every where.

Just load in the deg of rotation and the lift in 5 deg increments. then you can check the pitch between any two 5 deg reference points.

Will be a great tool to see the true progression in the blade.

I am pretty sure Jim can supply the maps if you ask him also.

 

[shoboat]

David,

I have the 2-D drawings of most of the new ABC line up that I am using myself.

They are full of information if you know how to read them.

Thanks,

Mark Sholund

 

[dwilfong]

Got the new 2517-19-38 and checked the cup. It is not bad at all 6.4 with a 3.9 lead in will not take much to get the cup down to 5.8 to start with.

It seams the boost pitch is less on the newest props than the first one I got last year this time.

Love this prop.............................

 

[shoboat]

David,

That propeller was not made yet last year. The one you had must of been the 45%

blade area instead of the 38% like most of this years propellers. The 38% blade area

have 1.5% cup in them, and the 45% blade area ones have 2% of the diameter cup

in them. The newest ones are really nice except for a few casting marks or holes thru

the blade every once in a while. When you want to step it up a little more try the 2519

it will really make you smile.

Thanks For Reading,

Mark Sholund

 

[dwilfong]

Got one of them also to try...........................

 

[stan simpson iv]

The NEW ABC props are working very well in the way Jim sells them. S/B out of the bag for us "Rookies". He has made a selection in EVERY size that will fit your needs without mod's.

If you are looking for a big prop you would like to mod. You can file the cup/pitch off the back edge yourself,round the ears...etc. It is not Rocket Science.(that's how I learned)

I just wanna thank you ABC(Jim) for the Great selection of your new props.

 

[shoboat]

Stan and Others,

You can sharpen and balance them and they will work.

The Octura propellers are the same way also. If you want

a little more out of them both, you need to learn what makes

them better. I my opinion, too much cup just kills our RPM out

of our nitro motors. My biggest modification to most propellers

is just a simple reduction of cup on the trailing edge so the

motor can spin more RPM. The other is to just match up the

blade length on a lathe. When you are no longer a "ROOKIE"

buying a pitch gauge and learning how to use it will help a ton.

And you are right, the best thing about the new "Game Changer"

series is all of the options in pitch ratios to choose from, and the

diameters as well. When the completed series is all done we will

have more propellers to choose from and that alone will make it

much better to fine tune our set ups. Stan how long have you

been boating? I doubt you are still a rookie at anything?

Thanks For Reading,

Mark Sholund

 

[charles siler]

Stan's right Jim told me the same thing these props are a sharpen balance and run product and Jim said not to cut the bar off but to cut it down gradually until they come alive . He said that's the best way to run these props.

Know Mark you do a good job on them but all that's wrong here is the props are not loading the motors. Also I have clear soft water and I get a lot of prop slippage instead on the muddy hard swamp water that most of the lower 48 has. Andy made a 1667 w/5.8 cup to run down the and a 6.4 for here even though I could probably run them down there.

The motors are more modded then before fall Nats 2 yrs ago and have new P/Ls and new bearings so don't blame the motors the just pulled the CoCr +5 props and they are monsters as you can see in the video it gets a bad launch and almost makes a full lap before it comes alive but after running it after that it's bouie 1 game on!

So I heard that if I don't like the props that I can train them in . Problem for me is the ponds here are starting to freeze can you have the others done mid of next week. I just wanted to say you have never let me down and I thank you for your hard work. And Stan or my self are not trying to give you a hard time about your way on doing the props it just kills the pocket book . And I pay top dollar so I can get the performance and experience to go fast man lol but I just bought a **** load of props from Walt Barney and it's balance sharpen and boom off to the races.

Thanks pass ya later Charlie

 

[ace]

another thing to charlie the leading edge pitch is higher on the +5 then the game changer props being mentioned ,I hope I haven't wasted my pocket money ordering these things

interesting

 

[Aron Alleva]

Ace,

Those 90s will pull those +5 nicely. You made a good choice. What pipes are you running?

 

[shoboat]

Charlie,

Send them back to me if you are not happy, I stand behind all my work.

I doubt your motors are going to pull stock 2821's ? The stock numbers are: 11.25"

of trailing edge cup at .7 radi, with an average pitch of 5.880" at 70.45 mm, if

you use the metric system 70.45 mm x 149 mm. If you need more load you will

be better off with 2818-20-50% blade area or 2918-20-50% like the gas boats run.

You will need more blade area ratio to hook up with your motors. The soft water

does not make these new propellers slip like some of the older designs. I can

drink the water out of the lake that I run at and these new designs run very well in

clean deep water. When you get all those propellers from Walt Barney and start to

sharpen and balance them, go run them with all the stock cup in the trailing edge

and could you share the results on video if possible? Believe me I have spent

More Time with these ABC propellers than most of the other people running them,

and I am pretty confident in my work Charlie. And I agree with you, you should get

your money's worth when you buy something. Please box them up and send them

back to me. I have two other sets that will load your motors very well. I am sure most

of the other propeller specialist would do the same as me and offer you a couple of

other options to try out and test? After all you paid $120.00 per set and they should

Work Well For You. The best thing about Jim's propellers are the choices that are

available now in the ABC propeller line up. And when you start to finish them and

run them I think you will learn quite a bit more about the numbers that are in them.

Thank You For Taking The Time To Share Your Results With Us. Your Business Is

Much Appreciated. Please send the propellers back to my address below.

Thanks,

Mark Sholund

4830 Arbor Grove Drive

Traverse City, MI 49685-7266

Any Questions Call Me At:

231-590-3023

 

[BigChuck]

AAAHHHH ...I have a Home for these .....I'm just saying..

 

[shoboat]

Chuck and Jeff,

I agree with yours and Jeff's assessment on the videos.

I am sure on another boat and motor combination that

these will easily go over 80+ MPH with more RPM.

Remember more pitch is not always faster if you cannot

turn the leading edge pitch with more RPM. And the same

goes for the blade area, More is not always Better.

Thanks For The Help,

Mark Sholund

 

[stan simpson iv]

Stan and Others,

You can sharpen and balance them and they will work.

The Octura propellers are the same way also. If you want

a little more out of them both, you need to learn what makes

them better. I my opinion, too much cup just kills our RPM out

of our nitro motors. My biggest modification to most propellers

is just a simple reduction of cup on the trailing edge so the

motor can spin more RPM. The other is to just match up the

blade length on a lathe. When you are no longer a "ROOKIE"

buying a pitch gauge and learning how to use it will help a ton.

And you are right, the best thing about the new "Game Changer"

series is all of the options in pitch ratios to choose from, and the

diameters as well. When the completed series is all done we will

have more propellers to choose from and that alone will make it

much better to fine tune our set ups. Stan how long have you

been boating? I doubt you are still a rookie at anything?

Thanks For Reading,

Mark Sholund

I have been in R/C boating 37 yr's,my son included. I have been involved in Control Line Airplane's,R/C Cars Touring and Drag Racing for another 25 yr's. I have enjoyed the Hobby in each form stated above.

R/C Boating will ALWAY's be our racing of choice,as Stan say's we will always be water babies.We both enjoy being around the people,competition,and Mother Nature. I enjoy running boat's with my son and the time in the garage together.

As far as being a Rookie...I,we learn something new almost everyday. Nothing wrong with being a Rookie,better than a know it all.

P.S. The know it all comment is not directed toward's anybody in boats. Just life in general...

 

[dr gary turner]

Well said Stan, Doc