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my new prop...

Leo, as you said 'with all due respect' ..... "this thread has only confused those who are too stuborn to accept reality."

That just may be the most arrogant, self serving bunch of crap that I've ever read on this forum. Unlike you, Sir, most of the folks on this forum deal from a position of experience.

Your theories are entertaining, and you have just enough fact in this diatribe of yours to make your viewpoints believable, but the plain truth of the matter, Sir, is that you are a theriorist, not a practitioner.

I have several hundred hours flying both single and tandem rotor helicopters, and several configurations of fixed wing aircraft with both conventional and constant speed propellers. Pitch is at best a transient issue. There are always compromises. I've used pitch to save my a$$, and I've used it to get me back when the fuel gauge was already much too far to the left.

The reality, if you are willing to accept it, is that most of us have to content ourselves with one prop that wil hopefully accomplish most of everything that we need our boats to do. There are children to raise, mortgage payments to be made, and we lack the luxury of being able to go in search of the 'perfect propeller'. Not that we wouldn't like to find it, but because the journey is both too expensive and totally unnecessary in order to have a great running airboat.

Yes, this is just my opinion.

olf

By the way. Where do you REALLY live?
 
Olf & leo we need people like both of you to keep this junk interesting LOL.

Thunder and white bear are needed too. I hope I bring something to it as well. this is a forum and many view points will be expressed some will be well received and some will be simply laughed at and passed over.

If it wasn't for the differences this would be a technical site which would be about as boring as watching paint dry.

I was bugged for mine and stans test data numbers and I would not give them up on here. Thunder was aware of them and the parameters under which the info was gathered. Not everyone would understand them and wrong conclusions would be drawn and money and time would be wasted because the devil is in the details in that stuff and when it comes to airboats the field is too broad with way too many variables to factor in for the average petrson to deal with. Stan and I were very patient and careful in gathering and comparing the data in each session. We have usable data that we understand and know how to use in a practical manner for real world applications. The biggest revalation came to us by accident as often is the case. I shared this with certain individuals who I knew would understand how to apply it in a meaningful manner properly. he won the quiet boat competition while I was pukin in my camper.

So there have been nuggets of wisdom in this thread and huge pieces of ego garnished with sarcasm and insults but all in all it has been worthwile reading. I think duckluv lost interest long ago and who could blame him. LOL I am only coming back now to see who is slingin what at who and if any of it sticks. So ya'll keep on and the rest of us will watch for the nuggets and try not to step in the piles as we meander through this thread.

But I will say when it gets right down to it ... once you know what you want out of your boat most adjustable props can be set to acheive it no matter who makes them given of course the practical limitations of diameter, you cant expect a 68" prop to run with a 82" prop on the same boat and engine setup. however each will perform equally well on the boat setup they were designed to run on.

with all that said it is time to burn some gas .... have fun folks ... I am putting away the therory and gettin down to practical application this weekend. I fixed my airflow across my rudders, it is amazing what a small offset and small difference in spread can make on them and the way your boat handles. i marked the place i wanted them and they got welded in wrong and I couldn't drive the boat but we got it now.
 
GREAT MINDS DISCUSS IDEAS;
AVERAGE MINDS DISCUSS EVENTS;
SMALL MINDS DISCUSS PEOPLE.

Elenor Roosevelt

Scotty
 
Ok, I have decided I will not stoop to calling names and reinterpreting what someone has said. I however wish to comment on this thread.

This has been a confusing thread, yes, very confusing. Not because the meat of the thread is hard to understand but because so many different folks have a different point of reference for their comments or their understanding. Some comments appear to be at odds, but in reality are in total agreement.

This is one of the best most technically inspiring threads I have seen here on the forum yet. I have learned some new things I didn't know and many others have been reconfirmed. I have had to read hard and re read many times to get it all.

When someone shares knowledge for free thats a good thing. We must keep in mind the manner pf speaking fom one side of the world is not exactly the same as on the other side, even if those speaking are using the same language. Semantics plays a huge part in it as does culture and education.

I have had to check myself even from getting agressive when I felt frustrated. My frustration was from trying to gain a new perspective though not fom attacking a personality and thats exactly what I started to do on back in the thread.

I wish we could have a thread like this with a marine engineer on hull design and one just like it on rigging design by a structural engineer.

Again, "I" feel this is one of the top threads for information I have seen here to date. It is customary to thank someone for their time when they make an effort to teach us somehting new. I for one appreciate Leo's efforts. I have seen his frustration trying to communicate with some of us as well, likely myself included.

If someone doesn't feel it necessary to follow the thread or they feel it is redundant thats on them and there is no reason for them to even be a part of it. However for those of us who have tried to learn something, we have gained and benefitted.

Its all too easy to attack the messenger when you don't like the message. The message here is the math and the concepts. Not the messenger and his verbalizations. He has spent his time and efforts for free to discuss this information and we owe him our thanks.

Scotty
 
I have enjoyed this thread. It has been very informative. i think these concepts are can be a little hard to grasp if you dont consider you can't change one parrameter without affecting the others. Hope no one felt attacked be any of my statements, if so I apologise.

Grant
 
WB,

I too have enjoyed the thread and also had to read twice some things to agree or come to reason with. "Can't teach an old dog a new trick" comes to play in my case some times. Hard to toss what my airboat pals have taught me sometimes.

Duckluv, how's the new prop by the way!

Basketcase
 
Hello all, First I must tell everyone I have learned so much here. This thread has been full of lots of info , lots of it I try to understand and lots I have learned. Overall this thread has given for free valuable information.

If we have 700 members then a lot of others have gained useful info as well. Not to mention guest reading this. I have read all threads as they appear and mainly lurk on the side lines until the weekend then I hit the river and apply some of what yall have taught me. I have never been steered wrong here , THANKS.

My father taught me something about letting others do things in my business. People will not allways do things as I would have done but in the end they will get the job done and sometimes as well if not better than I. I think what he meant was we all can do differently and reach the same goals.

Maybe this applies to airboating ,dont know for sure but I look forward to learning more on making my airboat perform better from all of yall.

Well I need to go burn some gas and catch some bass thanks to all Dean
 
I give up you must be an mechanical engineer or pilot. Here are three things you stated that I do not personally put in my top 5 concerns for how my airboat runs.
1. With more static thrust, the more capable is your boat on the ground.
2. With more static thrust, there is a better possibility that u can tow your friends stuck boat.
3. With more static thrust, you may be able to carry more load.

My top 5
1. vehicle response and nimbleness
2. how quick my boat planes, least amount of distance (got mine down to 9 or 10 ft)
3. MPH and ET within 400ft.
4. I hate a boat that rolls on it's side when you floor it. I will give up well over 25% thrust to achieve this, ironicly I will also loose seconds off my ET and gain MPH with less thrust.
5. Sound signature.
PLEASE DON'T THINK I'M SAYING HOW TO SET A PROP! I'M SAYING YOU CAN'T TELL SOMEONE WHAT'S THE BEST PITCH TO RUN BY FORMULAS OR STATIC THRUST TEST NUMBERS. I guess it's just me.
 
I guess I should mention also I would love to have a new prop also, as most of us, maybe one day i can.

I know you are enjoying yours duckluv.
 
"BUT IF ONE KEEPS ON INSISTING ON TALKING PEOPLE THAT YOU DONT NEED THAT, YOU DONT NEED THIS, THAT YOU ALREADY HAVE A WORKING PROP & WHY BOTHER LOOKING FOR MORE" --- THAT PERSON IS NOT ONLY STUBBORN BUT DUMB AS WELL.

You know, I Don't think it the info people on this site have problems with it's the attitude in which you convey your info. Your new to this site and you need to mind your manners. Over time you'll command respect of others not because your smart or knowledgeable, it's because people like you... I'm willing to bet you don't even have an airboat.

Geoff
 
Just a little info for the fella's Duckluv is my brother-in-law and we live about two blocks from one another. We have done a lot of work on his new hull but the only thing we lacked until recently was bringing him up to a three blade prop from two blade. My friend and boat builder had a 78" three blade for a good deal and we finally convinced Duckluv to get it. He was very apprehensive at first and his biggest concern was would he be able to swing it efficiantly. Well he swung it and swung it well so we pulled it down and raised the prop end of his engine just a little and put the prop back on and ran it for a test. You couldn't wipe the smile off his face with a shotgun. To the bayou we went the next day and low and behold every thing about the boat was awsome. The boat no longer porpused planed out quicker cruised at lower rpm and ran dry at approx. 500 rpm's less than before.

I think the real reason for this post was to let every one know how excited and happy he was with his new prop not trying to re-evaluate the theory of thrust. Also he maybe was able to help any one who currently runs a two blade on a similar rig feel better about upgrading to a three blade and knowing that it is an effective change that has a lot of benefits.

Just my point of view, but I hate to see a bunch of fighting over something that is controlled by so many variables. We airboaters have to stick together after all there is not to many of us out there and we need all the help and support we can lend to one another.

Well guys, let's all have a great weekend and burn some gas.
 
Hey, easy there Leo. It's clear that you are the smartest person on the site, just not the most experienced or considerate. I love reading the different opinons and the facts that back them up.

You just have a way of getting under peoples skin. Everyone is open for new ideas, but don't tell people they're wrong because we're not as smart as you. We like the input and not the put downs. OK?
 
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