Prop Rip
03-16-2004, 09:08 AM
#1
Prop Rip
Hello all,
I have been practicing my sequences and noticed that I am having a hard time preventing "prop rip" Airplane is a 2.6m with a DA-100 and a Mejlik 28-10. I am going to try flattening my throttle curve near the top a little to see if that will help, but can I do something else? How about a different prop? any suggestions to make it easier?
RickP
I have been practicing my sequences and noticed that I am having a hard time preventing "prop rip" Airplane is a 2.6m with a DA-100 and a Mejlik 28-10. I am going to try flattening my throttle curve near the top a little to see if that will help, but can I do something else? How about a different prop? any suggestions to make it easier?
RickP
03-16-2004, 08:49 PM
#2
Senior Member
RE: Prop Rip
Less power on the horizontal line is the key; just use less power. Try to get used to flying at a slower pace for sequence flying. I am flying horizontal lines at 1/3 - 1/2 power, which doesn't seem to rip my 28-10 Mejzlik. If that fails you can get a 25-12 three blade but that's a pricey fix.
03-16-2004, 10:41 PM
#5
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RE: Prop Rip
ORIGINAL: RickP
Hello all,
I have been practicing my sequences and noticed that I am having a hard time preventing "prop rip" Airplane is a 2.6m with a DA-100 and a Mejlik 28-10. I am going to try flattening my throttle curve near the top a little to see if that will help, but can I do something else? How about a different prop? any suggestions to make it easier?
RickP
Hello all,
I have been practicing my sequences and noticed that I am having a hard time preventing "prop rip" Airplane is a 2.6m with a DA-100 and a Mejlik 28-10. I am going to try flattening my throttle curve near the top a little to see if that will help, but can I do something else? How about a different prop? any suggestions to make it easier?
RickP
03-17-2004, 08:19 AM
#7
RE: Prop Rip
[quote]ORIGINAL: aerografixs
I hear that brother - but it's not cool loosing 5 points off of every sequence. I took a look at my throttle curve last night and put some more 'umph into 1/2 throttle. Turns out my last two points were at 57% and 75% No wonder - it worked when the motor was new, but now it is more of a switch. Hopefully that's fixed now and I'll try it this weekend.
Giestware,
I'll do a full throttle low level pass just for you to confirm that I can still "Rip" it LOL.
RickP
Ripping the prop is so cool
Giestware,
I'll do a full throttle low level pass just for you to confirm that I can still "Rip" it LOL.
RickP
03-17-2004, 11:58 AM
#8
RE: Prop Rip
OH... "PROP RIP" is the buzzing sound that the prop makes occasionally?!?!?!... I think it sounds cool too... but I fly on a dry lake with NO noise concerns... http://www.radiocontrolzone.com/foru...hreadid=157719
The solution I expect is to reduce the local (resultant) mach number at the tips.... lower rpms or smaller diameter.... or this..... (See Picture)
The solution I expect is to reduce the local (resultant) mach number at the tips.... lower rpms or smaller diameter.... or this..... (See Picture)
03-17-2004, 02:42 PM
#9
RE: Prop Rip
Prop rip-
I see guys overloading engines with props way too big for best performance -to eliminate prop rip-
bad idea .
Some see these big props as bragging rights
Any engine will rip a prop once the plane catches up with and passes the speed where the tips are loaded.
We found out long ago that tho a MenzS 27x10 ripped easily on our 80's, the performance was inferior to a good 26x10 ---
So we just went to better throttle management -
I see guys overloading engines with props way too big for best performance -to eliminate prop rip-
bad idea .
Some see these big props as bragging rights
Any engine will rip a prop once the plane catches up with and passes the speed where the tips are loaded.
We found out long ago that tho a MenzS 27x10 ripped easily on our 80's, the performance was inferior to a good 26x10 ---
So we just went to better throttle management -
03-17-2004, 10:50 PM
#10
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RE: Prop Rip
Yeah, but the neatest sounding rip is that one you get when the plane travels backwards at high rate and starts eating its own wash. It's not loud, but sure sounds cool!
03-18-2004, 08:46 AM
#11
RE: Prop Rip
Prop rip-
I see guys overloading engines with props way too big for best performance -to eliminate prop rip-
bad idea .
Some see these big props as bragging rights
I see guys overloading engines with props way too big for best performance -to eliminate prop rip-
bad idea .
Some see these big props as bragging rights
That is what I wanted to know - Thanks I'll stay with the 28-10 and put in some throttle curve to help me manage it.
BTW,
Other then the noise is the prop rip damaging in any way to the propeller or airframe? Are there any other side effects... While we are on the subject.
RickP
03-18-2004, 09:46 AM
#12
RE: Prop Rip
Good idea.
BTW- the 28x10 Mejzlic is about the same static load as their 27x10 .
Strange - but that's how it seems to be .
So you have POSSIBLY , a higher tip speed with that prop in the air which makes more noise.
We went through a similar test - and found that the Mejzlic 26x10 actually gave better overall performance.
You must exercize more throttle management but the model -in our tests- actually performed better on the smaller prop.
Faster recovery on uplines .
Don't be afraid that the 26x10 is too small for the 100- just use the power needed - then throttle back for the rest of the stuff.
Actually this is much easier on th engine -as it keeps temperatures down.
If you are into the hover stuff - it will also reduce load /heat -which kills lots of engines.
BTW- the 28x10 Mejzlic is about the same static load as their 27x10 .
Strange - but that's how it seems to be .
So you have POSSIBLY , a higher tip speed with that prop in the air which makes more noise.
We went through a similar test - and found that the Mejzlic 26x10 actually gave better overall performance.
You must exercize more throttle management but the model -in our tests- actually performed better on the smaller prop.
Faster recovery on uplines .
Don't be afraid that the 26x10 is too small for the 100- just use the power needed - then throttle back for the rest of the stuff.
Actually this is much easier on th engine -as it keeps temperatures down.
If you are into the hover stuff - it will also reduce load /heat -which kills lots of engines.
03-22-2004, 12:27 PM
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RE: Prop Rip
ORIGINAL: jongurley
I like the way the prop rip sounds when landing on a crosswind the the prop hits the centipede or bermuda..
I like the way the prop rip sounds when landing on a crosswind the the prop hits the centipede or bermuda..
Roger
03-22-2004, 12:28 PM
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RE: Prop Rip
ORIGINAL: jongurley
I like the way the prop rip sounds when landing on a crosswind the the prop hits the centipede or bermuda..
I like the way the prop rip sounds when landing on a crosswind the the prop hits the centipede or bermuda..
03-25-2004, 03:08 PM
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RE: Prop Rip
Back when I started flying about 5 years ago at age 18, APC was sending recruits to my high school with sponsorship offers I broke my share of props to start with..[8D]
I broke my share of props to start with..[8D]
