Excalibur Noise

Airboat propeller discussion.
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digginfool
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Excalibur Noise

Postby digginfool » Mon Dec 28, 2015 8:15 am

A week ago, I was praising the Excalibur and still do so for its overall performance. However, when I first had the 540 installed on my sled, the engine builder made some comments about the 'thrumming' sound the Excalibur makes. I didn't notice it at first but over time, it has become a bit annoying. Yesterday, I was talking to another airboater and he asked how I liked the Excalibur. I told him I loved the prop for the push. He explained to me he had the Excalibur and loved it for the same reason but couldn't stand the 'thrumming' sound and traded it for a 6 blade RazorX. Happy as heck, now. Still has great low-end push but got rid of the 'thrum' not to mention the top end performance gain. So, as you would guess, for the rest of the day, the 'thrum' really got on my nerves. To be clear, this is not a vibration. The boat is as smooth as can be, although I wonder if any harmonics from this sound is making its way into the motor. Has anyone else experienced this and is there anyway to clear it up? Stagger the pitch, maybe? It's really gotten to the point I'm ready to try another prop.
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trailerdon
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Re: Excalibur Noise

Postby trailerdon » Mon Dec 28, 2015 9:37 am

This is a good post. Everyone is always quick to rave about there prop and we never seem to here the negatives. Do to all the hype I had to try the NGQ, "It did push like a bulldozer". But one thing know one ever mentioned is the thump thump thump. So
away it went. I'm back to my old faithful "Q". It pushes great, nice and smooth, and is reasonably quiet. No it's not the latest and greatest, but it does everything I ask of it.

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Re: Excalibur Noise

Postby fl cracker » Mon Dec 28, 2015 5:57 pm

What is a thump thump ? The Q's are notable for their whop noise when your working the pedal. The NGQ will out shine a Q any day of the week. It's funny I spoke with sensenich rep today, he even stated how much better the NGQ Blades were. The Q's lack in mid and top range where the NGQ pushes all the way through. Diggin sell the WW blades and order some new Vortex blades. Iv heard nothing but good so far.
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Re: Excalibur Noise

Postby signcoc43 » Mon Dec 28, 2015 10:49 pm

I could never go back to a q after having my ngq. I ran Kissimmee a couple weeks ago and loved my top end when the poly got hot where the q would have flattened out and brought me to a stop. Never heard any weird noise from the ngq
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Re: Excalibur Noise

Postby SWAMPHUNTER45 » Tue Dec 29, 2015 6:10 am

Nothing bad to say about the NGQ it does everything and more with no negative qualities.


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Re: Excalibur Noise

Postby trailerdon » Tue Dec 29, 2015 9:04 am

Like I said, the NGQ pushed like a bulldozer. I'm not bashing the NGQ. boat ran like it had an extra 50 hp. However, that thumping of the air was more
than I could handle. Who knows, Maybe it was just my hull / rigging design. "telling it like it is"
Until now I never herd of the Excalibur making an unusual noise

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Re: Excalibur Noise

Postby digginfool » Tue Dec 29, 2015 10:00 am

Nice hijack of the thread, guys. Now, has anybody reduced the sound signature of the Excalibur by staggering pitch or other methods? This low frequency thrum is very annoying.
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Re: Excalibur Noise

Postby kwanjangnihm » Tue Dec 29, 2015 11:37 am

Big Casino wrote:I've been trying one out for a few weeks. It's a 72" four blade in a Bowtie Hub and staggered pitch. Surprised the Heck out of me, NO hi pitch whine... sounded like a big 2 blade


sidejobs wrote:The Excalibur def has its own sound.


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viewtopic.php?f=133&t=64308
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Re: Excalibur Noise

Postby digginfool » Mon Jan 11, 2016 10:43 am

Thanks to a bent rudder stop, my son knocked a 1/2 inch off the tips of two blades on the Excalibur. I was pressing my luck going with a 72" prop (hence, the rudder stop) and it bit me in the wallet. It's time to try something new, at least while the blades are being repaired. Going to have to go to 70". So, 5 or 6 blades, RazorX or Vortex? Still want something that's going to push.
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Re: Excalibur Noise

Postby supersnake60 » Mon Apr 25, 2016 9:02 pm

i have a excalibur 8 blade stagger and make no noise if your radiator or oil cooler is close to the prop it make the thump sound any prop will make that sound

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Re: Excalibur Noise

Postby digginfool » Mon Apr 25, 2016 9:47 pm

For the last 3 months, a friend has very generously let me use a 72" 6 blade Saber. I love the smoothness and it has decent push. Tomorrow, I'm taking the Saber off and putting the Excalibur back on. I really can't wait to see what the difference will be.
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Re: Excalibur Noise

Postby lariat » Tue Apr 26, 2016 5:54 am

digginfool wrote:For the last 3 months, a friend has very generously let me use a 72" 6 blade Saber. I love the smoothness and it has decent push. Tomorrow, I'm taking the Saber off and putting the Excalibur back on. I really can't wait to see what the difference will be.


Will be interested in the update!

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Re: Excalibur Noise

Postby Gary S » Tue Apr 26, 2016 6:52 am

I let a Excalibur go with boat I sold and kept a Q. Wish I had learned to live with the thump.

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Re: Excalibur Noise

Postby NightRider » Wed Apr 27, 2016 8:14 am

I have been running a four blade 72" Excalibur for close to a year and a half now and have never heard this "thrumming" you speak of. That being said, I have only ran them staggered, 2 1/2 degrees. Best prop I have ever ran, pushes good and pulls hard all the way through the rpm range.
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Re: Excalibur Noise

Postby digginfool » Wed Apr 27, 2016 9:49 am

Swapped the prop last night. Definitely a different sound than the Sabers but could instantly tell there was a lot more push, even though it was on the trailer. I'll be riding this weekend so will have a bit more to say next week about it.
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Re: Excalibur Noise

Postby digginfool » Mon May 02, 2016 9:40 am

It's Monday morning and the weekend is done. I burned around 25 gallons this weekend with the Excalibur back on the boat. It's a completely different machine with the Excalibur compared to the Saber. The Saber was glassy smooth in its power delivery and the boat ran fast and free. If I had a complaint, it would be that it lacks a bit of the low end push and I've never been too crazy about the high pitch whine of the blades; reminded me of a Warp. The Excalibur is different. It has huge push down low. Right now, my camp is an island and where I park, the boat is sitting on dry ground. The Saber would require a pretty good stab at the throttle to get moving, the Excalibur has the boat moving by 1/2 throttle. That's the main reason I put the 540 on the boat with the Excalibur; tired of getting stuck with the 160. Where the sound of the Saber was turbine like, the Excalibur sounds like a two-cylinder Diesel and the power delivery is about the same; lots of grunt, nothing up top. Like a jet engine, the Saber just keeps pushing harder the faster you turn it. The other thing that jumped out to me again is the way the Excalibur pushes the boat over on its nose at high throttle settings whereas the Saber kept the boat light and free. The most disconcerting part of all is the thrumming sound the prop makes. The engine builder pointed it out to me when he first test drove the boat. It took me a couple months to figure out what he was talking about but once I heard it, I couldn't 'un-hear' it. It's still there and still annoying as heck. I think the best way to describe it is like a low frequency harmonic; like the noise a hollow pipe makes if you swing it through the air. Before you ask, yes, everything is tight and the blades are all set to the same tenth of a degree using a digital gauge. I love the push and efficiency of the Excalibur but I think I need to go a different route.

While I had the Saber (and a huge thank you to the engine builder for letting me use it for nearly 3 months), I always felt that a 72" 6 blade was probably a bit too much prop for my motor. I wonder if a 72" 5 blade would be better but at the same time, I need to maintain that push down low. Wonder if one of the other multi-blade models offer what I'm looking for. Whether it's a Razor-X, Vortex or the Saber, would like to hear what your experiences have been. I know there's no one prop that does it all. I would stay with the Excalibur if it wasn't for the thrumming sound since it fits most of my desires but it's hard to go back after experiencing the glass smoothness of the Saber.
Last edited by digginfool on Mon May 02, 2016 10:38 am, edited 1 time in total.
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Big Casino
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Re: Excalibur Noise

Postby Big Casino » Mon May 02, 2016 10:34 am

Diggin'

I take it your leading and trailing blades are at the same pitch setting? If so, what your probably hearing is just the trailing blade running thru the "disturbed air" of the first. Kinda sorta like cavitation or two stock cars drafting. I've toyed with several different pitch combinations on my 74" Excalibur bowtie and found that a 2 to 2.5 degree delta between the blade pairs (trailing blade greater of course) not only sounds the best, but had just a bit more thrust as well. By adding pitch to the trailing blade it's able to grab more air which then makes the loading on each blade the same. Patty and Jim said that it has to do with the efficiency of each blade, and how the pairs work together as a unit, to essentially becoming one blade, etc.

Hope this helps.....
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Re: Excalibur Noise

Postby digginfool » Mon May 02, 2016 10:45 am

Big Casino wrote:Diggin'

I take it your leading and trailing blades are at the same pitch setting? If so, what your probably hearing is just the trailing blade running thru the "disturbed air" of the first. Kinda sorta like cavitation or two stock cars drafting. I've toyed with several different pitch combinations on my 74" Excalibur bowtie and found that a 2 to 2.5 degree delta between the blade pairs (trailing blade greater of course) not only sounds the best, but had just a bit more thrust as well. By adding pitch to the trailing blade it's able to grab more air which then makes the loading on each blade the same. Patty and Jim said that it has to do with the efficiency of each blade, and how the pairs work together as a unit, to essentially becoming one blade, etc.

Hope this helps.....


Yes, all four blades are pitched the same. If you're running a staggered pitch, did you take a degree out of the front and added a degree to the trailing to get your delta?
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Re: Excalibur Noise

Postby Big Casino » Mon May 02, 2016 10:49 am

Basically, Yes ... but its not a 1:1 correlation. But just start there, then adjust the pairs for the WOT/RPM your looking for. They like pitch !!!
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Re: Excalibur Noise

Postby lariat » Mon May 02, 2016 9:45 pm

Diggin, I too have a SV 540. I've had, and tested quite a few props on it. I have found for me that I like the staggered 6 bld Sabre the best overall. It has a lot of mid range push, and does not stop pushing on top.
Here is what I have tried, if you have any questions.
72" 5 blade warp
72" 3bld ngh
72" 5 bld Sabre
72" 3 bld Q
74" 2 bld ngq
72" 6 bld Sabre

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Re: Excalibur Noise

Postby digginfool » Tue May 10, 2016 9:48 pm

On another thread, some brainless Ace_Hole confused 'thrumming' with 'thrumping' (whatever the f*ck that is). I thought I would help him figure out what I'm talking about. Tomorrow while you're riding the short bus to wherever they keep you during the day, stop licking the window long enough to hang your head out in the breeze. That sound your ears make as the wind blows past the empty cavern in your skull is kind of what I'm talking about. 8) :thefinger:
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Re: Excalibur Noise

Postby jeepinocala1111 » Tue May 10, 2016 10:01 pm

digginfool wrote:On another thread, some brainless Ace_Hole confused 'thrumming' with 'thrumping' (whatever the f*ck that is). I thought I would help him figure out what I'm talking about. Tomorrow while you're riding the short bus to wherever they keep you during the day, stop licking the window long enough to hang your head out in the breeze. That sound your ears make as the wind blows past the empty cavern in your skull is kind of what I'm talking about. 8) :thefinger:


+1 great way of putting it :slap:

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Re: Excalibur Noise

Postby AceNtheHole » Wed May 11, 2016 12:20 am

Hay Diggin, Thrumming...Thrumping...who cares except you, doosh? Its only a word you made up anyway. LOL. You missed the point. Think about it, you're the one who put the wrong prop on your boat, now you whine on a daily basis about it. haha. I'm tired of reading your whiny posts here. Go cry in the mirror doosh!
Why did you feel the urge to dig up a dead thread? Clip, mag, Really? Who cares here except you doosh?
I'd rather hear you post here about how rich you are instead of bashing people over some semantic argument. Get a life A-hole!
BTW, can't wait to meet you in real life at the swimming hole and tell you what I really think about your sorry ass! Doosh!

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Re: Excalibur Noise

Postby digginfool » Wed May 11, 2016 8:20 am

Hey Short Bus. Here's a few notes for you.

AceNtheHole wrote:Hay Diggin, Thrumming (it's actually a word - look it up)...Thrumping (certainly not this - Thrumping. When your va-jay-jay smiles, tingles, or gets a weird sensation when being horny. The feeling above ones va-jay-jay of wanting or needing a sexual...)...who cares except you, doosh (the word is spelled d-o-u-c-h-e)? Its only a word you made up anyway. LOL. You missed the point. Think about it, you're the one who put the wrong prop on your boat (by that train of thought, looks like lariat bought 5 wrong props), now you whine on a daily basis about it. haha. I'm tired of reading your whiny posts here. (did you know you can ignore me? obviously you love my posts since you can't stop reading them) Go cry in the mirror doosh!
Why did you feel the urge to dig up a dead thread? (like I said, I'm pretty easily amused) Clip, mag, Really? Who cares here except you doosh?
I'd rather hear you post here about how rich you are instead of bashing people over some semantic argument. Get a life A-hole!
BTW, can't wait to meet you in real life at the swimming hole and tell you what I really think about your sorry ass! Doosh! (I think you just did. BTW, it's spelled d-o-u-c-h-e)


Hope that clears the air for you. 8)
“When plunder becomes a way of life for a group of men living together in society, they create for themselves in the course of time a legal system that authorizes it and a moral code that glorifies it” - Bastiat

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Re: Excalibur Noise

Postby AceNtheHole » Wed May 11, 2016 3:08 pm

LOL. Gotta love the way you go all internet drama queen with the red text. Classic!
BTW, how's that $35K sled doing with the thrumping prop? Is it running any better than it did when you bought it for 10K? LOL....


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