Four blade prop

[dngharvey]

*** !

Did not mean to start a sorta heated discussion but seems the question did just that.
Found a very inexpensive 13 X 15 four blade that will be experimented with and I'll add the results here when I can. If it does not work, can always get the money back and try something else.
Thank you all for your interest and input.

[zenoahphobic]

going back to the power pulses.



which engine spent more time with the flame burner on ?

.

We agree in principle the conventional belief is the twostroke.

But if I may add: it is not as simple as this. Twice as long in time at the same revolutions is not actually correct!

It depends very much on how advanced the ignition timing is, on the octane rating of the fuel, on the stroke of the engine, and of when the "flame" actually extinguishes.

On a fourstroke (they typically have a longer stroke to bore diameter ratio) the burn is going on all the way down the full depth of the bore, somewhat continues up the bore, and somewhat past the chamber into the exhaust header (think function and placement of catalytic convertors, and where air is injected in emission control systems, on that last statement).

Conversely a twostroke burn stops somewhat shorter, at the exhaust port almost half way down the bore stroke, and doesn't have any journey inside the bore on the upstroke. The burn also doesn't really continue into the exhaust chamber because of the interference of the cool incoming fresh fuel/air charge.

So a simple argument can be made that the length of time the twostroke flame burner is on is actually less than 1/4 of that compared with a forestroke on the power pulse. Because it happens twice a revolution that would make it [B]1/2[B]! In simple terms. That is a reason why a twostroke was commonly spoken of as a cooler running engine than a fourstroke.

So Rodbolt's explanation needs careful thought .

[RayBersch]

Did not mean to start a sorta heated discussion but seems the question did just that.
Found a very inexpensive 13 X 15 four blade that will be experimented with and I'll add the results here when I can. If it does not work, can always get the money back and try something else.
Thank you all for your interest and input.

I sought help from Powertech who also put me in touch with a NH shop that handled their props and much more - a great help for a somewhat confusing topic especially if you get into shaping the prop to tweak the performance. Also, I use stainless props which are a bit expensive and heavy. Good luck, I would be interested in your results.

[99yam40]

Did not mean to start a sorta heated discussion but seems the question did just that.
Found a very inexpensive 13 X 15 four blade that will be experimented with and I'll add the results here when I can. If it does not work, can always get the money back and try something else.
Thank you all for your interest and input.

Some people like to go on and on about things that have noting to do with your questions/ problems, so do not pay any attention to them if you can do that and still be able to find any input on your questions or problems mixed in with all of the junk they spew out on your thread.

they do make things difficult when you are looking for answers to you questions.
They would be best to start their own thread about their junk and leave yours alone so you can find what you need without having to filter out all of their stuff

[zenoahphobic]

Some people like to go on and on about things that have noting to do with your questions/ problems, so do not pay any attention to them if you can do that and still be able to find any input on your questions or problems mixed in with all of the junk they spew out on your thread.

they do make things difficult when you are looking for answers to you questions.
They would be best to start their own thread about their junk and leave yours alone so you can find what you need without having to filter out all of their stuff

Point taken (again).
Lighten up, I understand you have a low concentration span and many do. That's fine , it is just a chat forum, there are many casual readers that use this for whatever they want. Most intelligent people can sift out extraneous stuff.

There are forum rules that tend to be broken though, and you have somewhat breached those rules in your "*****" calling.

I understand that things go off at tangients and go on at length, it takes atleast two to make this happen, so I hope your reference to "some people" does include all, and not just those you feel are outside your perceived "brotherhood"; that you feel you owe loyalty to. Or that you are following an antiquated belief that certain people cannot be questioned.

Your reference to me as "when he first showed up" seems to imply I am somehow new to this forum; I do not know how long you have been following this forum before you became a member, but as you can verify I have been here many years, and if I recall your membership date was a glitch problem with new members registering well well after I did. I know you don't "big note" yourself, unlike some here, but I do have more seniority over yourself in age as well - so how can I be a ***** for this long?

[boscoe99]

I rather like and enjoy how threads evolve and we go off on tangents. Keeps life interesting.

How many times can the same drab answers be provided about propping, seal orientation and precision blend oil issues without it all becoming a bit boring? I sometimes am reluctant to answer the same tired questions that have been posed and answered a thousand times before.

Now we have two basic types of questioners. One type seems to think their problem is unique and has never been seen or heard of before. He wants to ask it even it there are already a hundred replies to his problem. The other type hears about a problem being solved and wants to know the solution since he is convinced that solution will be the one for his problem. Which it might be, but more than likely won't be.

[99yam40]

I tend to go off on tangents also at times( Depends on what is being drank), but it does not go on and on while the OP is still looking for answers(I hope).

I guess I consider *****ing when something is posted to bring up argumentative conversation just to argue . I am probably wrong on that definition.

It just gets old after awhile with no help heading to the OP and way off subject.
how would it be if every post had all of this going on and on. Not sure how many would be asking for help. Just saying it would be best to limit to a couple of posts so the op does not have to wade through it all.

A good place to have strange or real good convesations on all sorts of things is http://www.thehulltruth.com/dockside-chat-18/

[TownsendsFJR1300]

I need more popcorn!!

[RayBersch]

I need more popcorn!!

Here ya go, make all you want but be sure to share.

[TownsendsFJR1300]

Here ya go, make all you want but be sure to share.

Of course!!! How HOT should I get it?

Two stroke hot or four stroke hot??

"Two stroke hot" should be quicker, no?

[RayBersch]

Of course!!! How HOT should I get it?

Two stroke hot or four stroke hot??

"Two stroke hot" should be quicker, no?

Depends on how much butter you use.

[TownsendsFJR1300]

Depends on how much butter you use.

Well, the popper has a 4 blade spinner if that makes a difference... SS of course!

Forgot the pitch off hand...

[zenoahphobic]

Of course!!! How HOT should I get it?

Two stroke hot or four stroke hot??

"Two stroke hot" should be quicker, no?

Now we are getting to the nubb.

Depends whether we cook it here in Australia or over in your land of the free.

We get more heat here because our electricity is twice yours (240volts c/f 110 volts) . But wait a minute, you run yours at a higher frequency (60 versus 50 hertz. Higher frequency means better heat absorption ........ Hmmm ........Rodbolt please?

[TownsendsFJR1300]

Now we are getting to the nubb.

Depends whether we cook it here in Australia or over in your land of the free.

We get more heat here because our electricity is twice yours (240volts c/f 110 volts) . But wait a minute, you run yours at a higher frequency (60 versus 50 hertz. Higher frequency means better heat absorption ........ Hmmm ........Rodbolt please?

We have 240 for certain machines, but yes, this is 110 volt. "Hertz", we ain't renting a car!!!

Now, you have to keep in mind the water in the toilet rotates the opposite way from down under.

Of course that alone, is like running the spinning / cooking BLADE, backwards, thus loosing the RPM's, over cooking, corn getting over cooked.

No one like's burnt popcorn!!

Perhaps a lil extra directional oil may help.....

[zenoahphobic]

We have 240 for certain machines, but yes, this is 110 volt. "Hertz", we ain't renting a car!!!

Now, you have to keep in mind the water in the toilet rotates the opposite way from down under.

Of course that alone, is like running the spinning / cooking BLADE, backwards, thus loosing the RPM's, over cooking, corn getting over cooked.

No one like's burnt popcorn!!

Perhaps a lil extra directional oil may help.....

Ah yes the toilet twirls the other way and so does the heat and steam coming off our cooking...... Hang on......our big winds are cyclones and yours are tornadoes spinning in opposite directions........and tornadoes suck more! ....... So I think that would cool them more........ This thermal dynamics is mind blowing!!!

But back to the OPs four blade question. Would he perhaps get better hole shot with a left hand turning prop and change his leg to left hand????