Real Time Thrust Tests with Complete Boats

CarMotorBarge said:
There is just something sexy about a sled with a car motor.
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I agree 100% and to me the one in the video takes the prize. It has a bad to the bone stroked small block ford on it and will flate sure haul a$$. It has an insane top end but I cant say what it is. We dont know what it is yet because we havent been brave enough to find out. Its one of those boats that feels like it will just keep gaining as long as you will keep pushing it. To say the least, Its very impresive.

When you gonna come on up and check out the Gulf? You won't be disapointed. Come on up sometime and let us check out that bad a$$ ride you slidding around on.
 
I was going to shoot for either this spring or this summer. Where do you all normally ride? Horseshoe Beach is 200 miles from my house. If the Gulf wasn't so far, I would take a trip next week. My wife is unemployed right now so money is tighter. 200+ miles is a long way to pull a boat.
 
Go check out the Picture Gallery for all nine of the Test Boats ....
 

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Being a true ford guy, I can't wait to hear more about the junk yard motor. Maybe then I will build a car motor boat. Until then I just can't put a bowtie motor on something I own.
 
Being a true ford guy, I can't wait to hear more about the junk yard motor. Maybe then I will build a car motor boat. Until then I just can't put a bowtie motor on something I own.
 
captrndy said:
Being a true ford guy, I can't wait to hear more about the junk yard motor. Maybe then I will build a car motor boat. Until then I just can't put a bowtie motor on something I own.
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Capt'n ... I hear ya'.. Blue Oval man myself.

I still have a few days work to put all the data into a spreadsheet and build the graphs, then our group needs to review the data, etc. But many of us have driven that boat, and let me tell you first hand and without letting the cat out of the bag, I'll just say this ....

HOLY SH*T!!!!!!!!!!!!!!!!!!!!!!!!!!! :salute: :salute: :salute: That thing is a MAN!!!
 
Thanks for all the positive comments guys and I promise there will be numbers posted. Its just taking a bit to get everything sorted thru.
 
The web junk yard ford runs great so did an ac full of fishing poles and coolers. The whole idea of the test was to produce real time data in working boats win loose or draw. every body involved worked real hard to make it happen. Special thanks to jim allen for providing the test equipment. Randy for the facility and all the rest who added into the mix. This whole exercise was about real boats running as you see them every day. I ran my boat as rigged it did not produce the high numbers expected. No problem for me I wanted to see where it performed as I run it in the marsh. The engine dynos at 602 hp at 6000 rpm I have it running 4900 to 5000 with a four blade r pitched at a full three mark on a 2.68 drama gear box using the evil dan the man short hub. I cruise at 2200rpm at about 23 mph. In a head wind or loaded it jumps to 2700rpm. had it bumping 70mph gps before i made the unexpected hard right hand turn. I am running an ultral light 16 x 8 jimmy white hull the bare hull weighs 480lbs before polymer. which I just added. The boat made just over 1300lbs of thrust on this test. It tested above 1570 with a bunch of pitch out of the prop on the last test done by Garrett last year. I am very happy with the boat engine and hull as set up. I hope all the data gets posted soon. Jims scales were not working when I tested my boat I will post the weight as rigged soon as i can get to a certified scale. The only real surprise to all of us was the sound level of all boats car motor or air craft was with in on or two decible points. The ac was a higher pitch and more ear sensitive but exactly the same level of sound as measured.
 
Anvil, you mentioned sound level and earlier somebody else mentioned sound level all being about the same, I know both WW and Sens both make props that they advertise as being super quiet. Were any of those tested on car motors and did they appear quieter then some of the older style props. I here people on here comment occasionally that their prop is so quiet they can talk easily over it at cruise speeds, that is info I am looking for. Bud
 
akblackdawg said:
Anvil, you mentioned sound level and earlier somebody else mentioned sound level all being about the same, I know both WW and Sens both make props that they advertise as being super quiet. Were any of those tested on car motors and did they appear quieter then some of the older style props. I here people on here comment occasionally that their prop is so quiet they can talk easily over it at cruise speeds, that is info I am looking for. Bud
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all the wider props are quieter to the ear a cruise once you get them up to max they are all about the same. I run my race -ride step hull with eight sabers and a 2.68 box all day with no ear muffs same with my ride boat four 82 inch r s as long as i am not flat out they are fairly quiet. when I was running my two blade water walker with the tall gear belt box it was noisy because it was spinning up near max all the time. all props are noisy when aproaching max rpm. the quietest prop we tested was a wood prop on an air craft engine. The narrow props produce a sound that is much higher pitched and produces the illusion of more noise. the fact is the sound on all the props tested was very near the same in decible level at wide open. The slower you can turn a prop and get a good result is optimum for quiet operation. cntry has been doing this sound testing for years he has probubly made the quietest air boat built. We ran a bunch of combinations of motors props and exaust systems they all varied in noise until pushed to the max. Wide blades and car motors with good muflers are the key to quiet at moderate speeds. There is no magic quiet prop. It seems the solution is to turn as much prop as possible at a low rpm. Wide blades and lots of gearing and a very good exaust system to quiet the motor.
 
I was just informed by our project manager that a q blade was .8 quieter than the wood prop if it makes any difference. in the interest of being politically correct.
 
Hats off to all you guys for the hard work, be cool to see the numbers and all the data when you have it a form for us dummy can understand :lol: :lol: :salute: :salute: :salute: :salute: :salute: :salute: :salute:
 
anvil said:
The web junk yard ford runs great so did an ac full of fishing poles and coolers. The whole idea of the test was to produce real time data in working boats win loose or draw. every body involved worked real hard to make it happen. Special thanks to jim allen for providing the test equipment. Randy for the facility and all the rest who added into the mix. This whole exercise was about real boats running as you see them every day. I ran my boat as rigged it did not produce the high numbers expected. No problem for me I wanted to see where it performed as I run it in the marsh. The engine dynos at 602 hp at 6000 rpm I have it running 4900 to 5000 with a four blade r pitched at a full three mark on a 2.68 drama gear box using the evil dan the man short hub. I cruise at 2200rpm at about 23 mph. In a head wind or loaded it jumps to 2700rpm. had it bumping 70mph gps before i made the unexpected hard right hand turn. I am running an ultral light 16 x 8 jimmy white hull the bare hull weighs 480lbs before polymer. which I just added. The boat made just over 1300lbs of thrust on this test. It tested above 1570 with a bunch of pitch out of the prop on the last test done by Garrett last year. I am very happy with the boat engine and hull as set up. I hope all the data gets posted soon. Jims scales were not working when I tested my boat I will post the weight as rigged soon as i can get to a certified scale. The only real surprise to all of us was the sound level of all boats car motor or air craft was with in on or two decible points. The ac was a higher pitch and more ear sensitive but exactly the same level of sound as measured.
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Anvil,

What were you pitched at for the 1570 test last year? Thanks.
 
anvil said:
I was just informed by our project manager that a q blade was .8 quieter than the wood prop if it makes any difference. in the interest of being politically correct.
Click to expand...

Anvil,

Did you do sound measurements at different RPM levels? At WOT I would expect the car motors to be louder because they are making more HSP. I strongly doubt that anybody is going to throw away their carbon fiber prop and go buy a woodie tomorrow. So analysis of the data needs to be done to understand what is really happening. I only want a good woodie for romancing the wife and not for riding airboats. :lol:
 
anvil said:
akblackdawg said:
Anvil, you mentioned sound level and earlier somebody else mentioned sound level all being about the same, I know both WW and Sens both make props that they advertise as being super quiet. Were any of those tested on car motors and did they appear quieter then some of the older style props. I here people on here comment occasionally that their prop is so quiet they can talk easily over it at cruise speeds, that is info I am looking for. Bud
Click to expand...
all the wider props are quieter to the ear a cruise once you get them up to max they are all about the same. I run my race -ride step hull with eight sabers and a 2.68 box all day with no ear muffs same with my ride boat four 82 inch r s as long as i am not flat out they are fairly quiet. when I was running my two blade water walker with the tall gear belt box it was noisy because it was spinning up near max all the time. all props are noisy when aproaching max rpm. the quietest prop we tested was a wood prop on an air craft engine. The narrow props produce a sound that is much higher pitched and produces the illusion of more noise. the fact is the sound on all the props tested was very near the same in decible level at wide open. The slower you can turn a prop and get a good result is optimum for quiet operation. cntry has been doing this sound testing for years he has probubly made the quietest air boat built. We ran a bunch of combinations of motors props and exaust systems they all varied in noise until pushed to the max. Wide blades and car motors with good muflers are the key to quiet at moderate speeds. There is no magic quiet prop. It seems the solution is to turn as much prop as possible at a low rpm. Wide blades and lots of gearing and a very good exaust system to quiet the motor.
Click to expand...

I definitely agree with all of this. I will also throw in "light as possible". Lower weight allows you to get lower RPMs. Do a search on this website for sound testing. You will see that WT kicked everybodys butt at cruise RPMs at a sound competition. He was using S blades on a really light hull with 2 ordinary mufflers. He also beat everybody at WOT and he had lots of HSP on that boat.
 
If someone smarter than me will chime in, isn't .8 pretty significant? I thought than one decibel difference was perceived as double the sound ie.88 decibels is twice as loud as 87 to the human ear
Anyone? Trying ok learn not talking sh!t lol
 
heres a link that will help explain percepsion of sound
http://www.gcaudio.com/resources/howtos/loudness.html
 
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