Real Time Thrust Tests with Complete Boats

A general, non-powerplant specific, discussion on airboat technology, ie., hulls, rigging, polymer, etc..
User avatar
bowhunterfl
Site Supporter - IV
Site Supporter - IV
Posts: 444
Joined: Fri Mar 04, 2011 9:56 am
Location: high spring

Re: Real Time Thrust Tests with Complete Boats

Post by bowhunterfl » Thu Jan 26, 2012 5:57 am

Nice work guys looking good.
14' combee 454 BBC 2to1 belt drive spinnen 3 wirlwind master blasters.

BlowInIt
Site Supporter - II
Site Supporter - II
Posts: 1627
Joined: Tue Jun 23, 2009 7:07 pm
Location: Melbourne

Re: Real Time Thrust Tests with Complete Boats

Post by BlowInIt » Thu Jan 26, 2012 7:23 am

Dont let FL Cracker see that the Q out performed the NGH! lol

Looks like 2700 is the sweet spot for a 2 Blade Q on a 6 cylinder.

Last month everyone was selling there Q blades to get the NGH blades.... looks like the tide will change once again.

dshaw94
Southern Airboat Member
Posts: 64
Joined: Fri Aug 26, 2011 11:41 pm

Re: Real Time Thrust Tests with Complete Boats

Post by dshaw94 » Thu Jan 26, 2012 7:46 am

Great data guys!!! That is really useful information. I am very surprised to see how much the Q series dropped off with less pitch. Assuming that GITSO produces 285ish horsepower at 2750 it is a safe assumption that it is making about 300 horsepower at 3000 rpm (assuming the torque drops from 2750 rpm and is around 525 ft lbs at 3000 rpm). That would indicate that the Q at pitch mark 3.25 is making 3.08 lbs of thrust per hp while at pitch mark 2.5 is only making 2.09 lbs of thrust per hp. That’s a huge fall off!!!!

I also found it interesting that with both the Q series and the NGH at .25 pitch mark increases the rpm remained constant. I see all the rpm's are rounded to the hundreds. Does rounding account for this apparent coincident rpm at different pitch settings?

Big Casino due you have the actual degrees of pitch that the test were done at? As I understand it the pitch marks are mainly a reference and can very slightly from blade to blade.

Thanks for the great info!!!
We all got it coming, kid. (William Money)

fl cracker
Site Supporter - II
Site Supporter - II
Posts: 4033
Joined: Thu Aug 20, 2009 9:15 pm
Location: Sorrento,FL

Re: Real Time Thrust Tests with Complete Boats

Post by fl cracker » Thu Jan 26, 2012 10:07 am

Change the pitch to 3 1/4 on the NGH Like the Q and i am sure the numbers will be surprising. One thing is a Fact with the NGH is - Quieter prop, Better crusie speed at lower RPM & Higher Top speed. Is there anybody that has not experianced what i just stated? How do you achieve a higher top speed? More push, More Efficient prop! 8) Like i said in the past the Q is bad ass prop but it will never make it back on my boat as long as the NGH is around. Follow me if can :D
" I have two guns...
One for each of you "

2017 Al David / stroked LS

User avatar
Big Casino
Site Supporter - IV
Site Supporter - IV
Posts: 1149
Joined: Wed Nov 11, 2009 7:03 pm
Location: Suwannee County

Re: Real Time Thrust Tests with Complete Boats

Post by Big Casino » Thu Jan 26, 2012 10:55 am

Thanks Bowhunter!!!

BlowinIt, yes the Q did seem to like more pitch and run around 2700/2800 ... We not trying to pit prop X against prop Y. We just tested what we could get our hands on, for all the boats, for that matter, Thanks!

DShaw, Thanks!!! your correct, the motor was estimated at 300 hp. RPMs were recorded for all boats as accurately as possible by the operator. We used the same few operators for all tests. But obviously differences in tach and such can play a factor in the data. I didnt "round" any data, I used it as it was best recorded in the field. The pitch marks referenced for all boats were the physical knotchs on the shanks, not the stickers. We did not measure the blade pitch angle with a digital protractor if thats what your asking. As our process matures, I'm sure we may be able to become more suffisticated in our measurements, but for now we just played the card we were holding.

flcracker, Thats actually a very good idea... Thank You!!! We'll have that same motor back up on the trailer in the future to test the WisperTip and Sabers, I'm sure we can take a stab at the NGH two blade with more pitch to see how it restacks itself in the line up. We've actually discussed taking a particular prop and recording the thrust every few hundred RPM and not just at cruise and WOT. I'll be able to make a line graph showing the thrust curves. So much more to come, as I've said before.... and oh yeah... i aint skeer't ta follow ya' if you aint skeer't to let me get behind ya...Ive been known to forget to use my brake pedal... LMAO!!!! (sometimes its more fun to laugh at myself :lol: )
"...This above all: to thine own self be true..."

User avatar
mmuscott
Southern Airboat Member
Posts: 37
Joined: Mon Sep 29, 2008 11:47 am
Location: Citrus Co.

Re: Real Time Thrust Tests with Complete Boats

Post by mmuscott » Thu Jan 26, 2012 11:47 am

Thank you Thank You Thank you....for all of the information that you have provided. It is very interesting...I keep looking for more data to come out all the time. I'm sorry there are so many folks who want to complain. It is a lot of time and effort to put this out and I know you don't have to share it with the folks on SA. but I'm glad you do. We've all questioned "how would that prop do on my boat" and if you don't have the funds or friends who have that prop, you have no way of telling. So Again. THANK YOU!! :cheers: :cheers: :cheers:

Roxy7430
Site Supporter - II
Site Supporter - II
Posts: 348
Joined: Sat Aug 15, 2009 9:59 pm
Location: Bell, FL (Gilchrist County)

Re: Real Time Thrust Tests with Complete Boats

Post by Roxy7430 » Thu Jan 26, 2012 12:14 pm

Big Casino wrote:Thanks Bowhunter!!!

BlowinIt, yes the Q did seem to like more pitch and run around 2700/2800 ... We not trying to pit prop X against prop Y. We just tested what we could get our hands on, for all the boats, for that matter, Thanks!

DShaw, Thanks!!! your correct, the motor was estimated at 300 hp. RPMs were recorded for all boats as accurately as possible by the operator. We used the same few operators for all tests. But obviously differences in tach and such can play a factor in the data. I didnt "round" any data, I used it as it was best recorded in the field. The pitch marks referenced for all boats were the physical knotchs on the shanks, not the stickers. We did not measure the blade pitch angle with a digital protractor if thats what your asking. As our process matures, I'm sure we may be able to become more suffisticated in our measurements, but for now we just played the card we were holding.

flcracker, Thats actually a very good idea... Thank You!!! We'll have that same motor back up on the trailer in the future to test the WisperTip and Sabers, I'm sure we can take a stab at the NGH two blade with more pitch to see how it restacks itself in the line up. We've actually discussed taking a particular prop and recording the thrust every few hundred RPM and not just at cruise and WOT. I'll be able to make a line graph showing the thrust curves. So much more to come, as I've said before.... and oh yeah... i aint skeer't ta follow ya' if you aint skeer't to let me get behind ya...Ive been known to forget to use my brake pedal... LMAO!!!! (sometimes its more fun to laugh at myself :lol: )

We did verify every tach on the first test. We did this with a digital timing light that also gave a digital RPM readout. Surprisingly all were near dead on. We did not verify on subsequent tests as there was no apparent need.
Jim Allen, President
Go Ballistic Airboat Co
352 463 3960
jim.a@pharma-mgt.com

fl cracker
Site Supporter - II
Site Supporter - II
Posts: 4033
Joined: Thu Aug 20, 2009 9:15 pm
Location: Sorrento,FL

Re: Real Time Thrust Tests with Complete Boats

Post by fl cracker » Thu Jan 26, 2012 12:27 pm

10 4 brother, the chart will be cool to check out. Y'all are doing a fine job!
" I have two guns...
One for each of you "

2017 Al David / stroked LS

User avatar
MJD291
Site Supporter - II
Site Supporter - II
Posts: 1889
Joined: Wed Sep 21, 2005 11:58 pm
Location: OAK HILL FLA

Re: Real Time Thrust Tests with Complete Boats

Post by MJD291 » Thu Jan 26, 2012 1:30 pm

I am looking forward to see what the Whisper Tip results are going to be. Thank you for all of your hard work doing this testing. Numbers don't lie and maybe now we can see what the true performance is. Who knows maybe we can get fl cracker to trade that N.ever G.onna H.appen in on a Whisper Tip or a Q. :violent1: :lol: Just kidding buddy!
I LOVE THE SMELL OF AV GAS IN THE MORNING. IT SMELLS LIKE..... VICTORY

User avatar
yobee
Site Supporter - VIII
Site Supporter - VIII
Posts: 5819
Joined: Thu Sep 18, 2008 8:46 pm
Location: deltona, FL

Re: Real Time Thrust Tests with Complete Boats

Post by yobee » Thu Jan 26, 2012 5:08 pm

I just thought about it... lets stack up an ngh with and without the "winglets" on the same boat and see what they do!
Life is great, without it you'd be dead.
Volusia County Sportsmen's Conservation Association Member
http://lakeokeechobeeairboatassociation.org/
Continental powered Performance hull.

fl cracker
Site Supporter - II
Site Supporter - II
Posts: 4033
Joined: Thu Aug 20, 2009 9:15 pm
Location: Sorrento,FL

Re: Real Time Thrust Tests with Complete Boats

Post by fl cracker » Thu Jan 26, 2012 5:22 pm

Guys I don't get jack sheet for cheering for NGH props or QuickSlick, I just know they work extremely well! I like to point a brother in the right direction lol
" I have two guns...
One for each of you "

2017 Al David / stroked LS

poobought
Site Supporter - V
Site Supporter - V
Posts: 925
Joined: Fri Jan 23, 2009 1:45 pm
Location: Live Oak FL

Re: Real Time Thrust Tests with Complete Boats

Post by poobought » Thu Jan 26, 2012 9:01 pm

fl cracker wrote:Guys I don't get jack sheet for cheering for NGH props or QuickSlick, I just know they work extremely well! I like to point a brother in the right direction lol
Guys, please don't turn this into a pissing contest on props. That is not what this thread is about. But I must defend the NGH, just wait till yall see the second test numbers on the 0540 boat.

poobought
Site Supporter - V
Site Supporter - V
Posts: 925
Joined: Fri Jan 23, 2009 1:45 pm
Location: Live Oak FL

Re: Real Time Thrust Tests with Complete Boats

Post by poobought » Sat Jan 28, 2012 8:11 pm

I was just told some more info will be posted in the morning but not sure wich boat.

User avatar
Big Casino
Site Supporter - IV
Site Supporter - IV
Posts: 1149
Joined: Wed Nov 11, 2009 7:03 pm
Location: Suwannee County

Re: Real Time Thrust Tests with Complete Boats

Post by Big Casino » Sat Jan 28, 2012 8:30 pm

The 540 will be next up in the morning, then several car motors then ALL the "R" results in one chart.

Were on our way back from Gasparilla, otherwise I would have posted tonigh.
"...This above all: to thine own self be true..."

User avatar
Big Casino
Site Supporter - IV
Site Supporter - IV
Posts: 1149
Joined: Wed Nov 11, 2009 7:03 pm
Location: Suwannee County

Re: Real Time Thrust Tests with Complete Boats

Post by Big Casino » Sun Jan 29, 2012 9:42 am

Here's the data on our 540 Test boat
Attachments
All 540 Test.jpg
All 540 Test.jpg (45.41 KiB) Viewed 1448 times
"...This above all: to thine own self be true..."

User avatar
Big Casino
Site Supporter - IV
Site Supporter - IV
Posts: 1149
Joined: Wed Nov 11, 2009 7:03 pm
Location: Suwannee County

Re: Real Time Thrust Tests with Complete Boats

Post by Big Casino » Sun Jan 29, 2012 9:44 am

This chart shows all the data collected on the "Q"
Attachments
Q Thrust.jpg
Q Thrust.jpg (39.21 KiB) Viewed 1446 times
"...This above all: to thine own self be true..."

User avatar
Big Casino
Site Supporter - IV
Site Supporter - IV
Posts: 1149
Joined: Wed Nov 11, 2009 7:03 pm
Location: Suwannee County

Re: Real Time Thrust Tests with Complete Boats

Post by Big Casino » Sun Jan 29, 2012 9:46 am

Proof Positive of value of Static Thrust Trailer Testing to the average boat owner
Attachments
NGH Thrust.jpg
NGH Thrust.jpg (62.09 KiB) Viewed 1444 times
"...This above all: to thine own self be true..."

User avatar
MilkManDan
Site Supporter - IV
Site Supporter - IV
Posts: 619
Joined: Tue Jan 06, 2009 10:34 pm
Location: Thonotosassa, FL

Re: Real Time Thrust Tests with Complete Boats

Post by MilkManDan » Sun Jan 29, 2012 10:03 am

Looks like the NGH likes higher RPM's than the Q.

The last chart is the most interesting to me. Makes you wonder if the difference is seats, cage (both look to have 4x4 wire but one is a full and the other is a hybrid), or what.

cummins diesel power
Southern Airboat Member
Posts: 1026
Joined: Sun May 17, 2009 4:39 pm
Location: Lake Whitney, Texas
Contact:

Re: Real Time Thrust Tests with Complete Boats

Post by cummins diesel power » Sun Jan 29, 2012 10:26 am

absolutely, its blades arent as wide as a q series.
15x7 1974 airgator,500 cadillac dd,74" q series sensenich prop, 1/2" uhmw poly.
18x8 2001 panther, 502 chevy, 2 to 1 century,3 blade 78" stump puller, 1/2" poly

User avatar
Big Casino
Site Supporter - IV
Site Supporter - IV
Posts: 1149
Joined: Wed Nov 11, 2009 7:03 pm
Location: Suwannee County

Re: Real Time Thrust Tests with Complete Boats

Post by Big Casino » Tue Jan 31, 2012 8:37 pm

I can't believe I didn't hear more from from my AC brothers with that last series of charts :sleepy2: :sleepy2: ....

Oh well! Guess I'll get the cookies out and post some CM data with R blades, for all those on the darkside..... :scratch:
"...This above all: to thine own self be true..."

captrndy
Site Supporter - III
Site Supporter - III
Posts: 446
Joined: Tue Jan 06, 2009 8:56 pm
Location: Homosassa,FL

Re: Real Time Thrust Tests with Complete Boats

Post by captrndy » Tue Jan 31, 2012 8:47 pm

Hey big, I can't wait to see some of the saber results for the ac crew. Especially the 5 blade test. i have the 72" ngh so I know it pushes m boat well. One other question do you run a crew for pike? I work for a co-op.

User avatar
Big Casino
Site Supporter - IV
Site Supporter - IV
Posts: 1149
Joined: Wed Nov 11, 2009 7:03 pm
Location: Suwannee County

Re: Real Time Thrust Tests with Complete Boats

Post by Big Casino » Tue Jan 31, 2012 8:53 pm

Saber Testing is still a few more weeks out. We are still planning to test 4, 5, and 6 blade setups when we do.

PM sent about other question .....
"...This above all: to thine own self be true..."

fl cracker
Site Supporter - II
Site Supporter - II
Posts: 4033
Joined: Thu Aug 20, 2009 9:15 pm
Location: Sorrento,FL

Re: Real Time Thrust Tests with Complete Boats

Post by fl cracker » Tue Jan 31, 2012 9:03 pm

Are you going to do a a 2 blade NGH with more pitch?
" I have two guns...
One for each of you "

2017 Al David / stroked LS

fl cracker
Site Supporter - II
Site Supporter - II
Posts: 4033
Joined: Thu Aug 20, 2009 9:15 pm
Location: Sorrento,FL

Re: Real Time Thrust Tests with Complete Boats

Post by fl cracker » Tue Jan 31, 2012 9:08 pm

The 540 shows numbers at 950 with a 3 blade at #2. the 520 shows less thrust #'s at the same pitch but the props are set the same with the same RPM. I don't understand?
" I have two guns...
One for each of you "

2017 Al David / stroked LS

poobought
Site Supporter - V
Site Supporter - V
Posts: 925
Joined: Fri Jan 23, 2009 1:45 pm
Location: Live Oak FL

Re: Real Time Thrust Tests with Complete Boats

Post by poobought » Tue Jan 31, 2012 9:43 pm

fl cracker wrote:The 540 shows numbers at 950 with a 3 blade at #2. the 520 shows less thrust #'s at the same pitch but the props are set the same with the same RPM. I don't understand?
This also has us scratching our heads to. All we can figure out is the air flow to the prop is disturbed. Its odd because the 0540 boat looks to have a more of a restrictive air flow.

Post Reply

Return to “Airboat Tech”