What is detounging and how do you balance props?

[Blackjack-sven]

I have a grim racer 3 blade prop and an octura x642 prop and was wondering how to balance them. Do you remove the material from the center section or the blades themselves? And what does detounge mean?

[teach]

I have a grim racer 3 blade prop and an octura x642 prop and was wondering how to balance them. Do you remove the material from the center section or the blades themselves? And what does detounge mean?

http://rcboat.com/prop.htm and the link in the tips and info page have gotten me off to a good start.

[bwells]

I'm no pro on this but this is my story. Bought a balancer from KINTECRACING for 35 bucks and it is nice. 2 magnets with the shaft between them and it will spin forever. I got 2 x447 l/r for my villian and proceeded to file on the leading edge while also sharpening it. It took a long time and the right knee on my jeans are gone. I was able to get it to almost balance but it would always stop in the same position, Blades horizontal, could not tell what to file next. Tried it out and did not see any difference between stock plastic stuff. Just ordered an x642 for my bj26, when it comes I'm sending all 3 to eggneg and call it good. DEtounguing is removing the front most part of the blade as this has the lowest pitch and slows the blade down when it enters the water. Octura's M series (modified) has this feature I think. Good luck!

[Ub Hauled]

Go here for all your prop needs:

http://www.offshoreelectrics.com/inf...r_Tips_&_Info_

[bwells]

egg neg has a post today, check him out

[ReddyWatts]

Removal of the prop tongue

This is a photo of an Octura M prop setting on top of an X prop. The M is a factory detounged X. You do not need to remove a lot of the tongue to change top end performance.

[tharmer]

Not to derail the thread too much, but is there a book that reallly talks about all the issues involved in performance modding of RC props? There are bits of info here and there but I haven't found a central source that compiles it all.

-t

[Flying Scotsman]

Not to derail the thread too much, but is there a book that reallly talks about all the issues involved in performance modding of RC props? There are bits of info here and there but I haven't found a central source that compiles it all.

-t

Not really, it is an art that serious racers have learnt through trial and error and type of hull etc.
A perfect example was where Brian Bass took a stock UL-1 to over 60mph with a tweaked prop.

Douggie

[Darin Jordan]

This is the best, most simplified example describing prop prep that I've been able to find...

http://rcboat.com/prop.htm

However, no amount of "theory" replaces simply TRYING it and figuring out what works and what doesn't... You are going to have to be willing to ruin a prop or two before you really start figuring out what to do... just part of the game...

However, one prop that is ruined for a particular app, may turn out to be just what you need for another, so it's all valuable learning... And the learning never stops... In fact... Brian told me yesterday that he talked with Jim Shafer (ABC Props) and now has some more insight... GREAAAATTT! Just what the rest of us needed to hear!

[Blackjack-sven]

This is the best, most simplified example describing prop prep that I've been able to find...

http://rcboat.com/prop.htm

However, no amount of "theory" replaces simply TRYING it and figuring out what works and what doesn't... You are going to have to be willing to ruin a prop or two before you really start figuring out what to do... just part of the game...

However, one prop that is ruined for a particular app, may turn out to be just what you need for another, so it's all valuable learning... And the learning never stops... In fact... Brian told me yesterday that he talked with Jim Shafer (ABC Props) and now has some more insight... GREAAAATTT! Just what the rest of us needed to hear!

That was a great source of very good info. Thanx

[tharmer]

Nevertheless, there must be some general rules. For example what do you do to reduce lift? How can you increase lift? How can you concntrate the thrust cone and when should you want to do that? Etc.

-t

[bwells]

No one has said whether you should balance the drive dog and prop at the same time, together. They are one when running. I used a felt pen to mark the prop and dog so they go together the same way every time. The grub screw must have a different weight than solid metal on the opposite side unless it is so close to the shaft, it does not matter. For my applications it doesn't matter but I figured, what the heck, no big deal

[DISAR]

I've read here that the trailing should also be sharpenned but until now I knew the trailing edge to be flat. So what is the correct way for the trailing edge, sharpenned or flat?

[egneg]

It should be flat and have sharp edges.

[DISAR]

Ok cleared, thanks