Merco 29 propeller recommendations
07-31-2013, 04:42 AM
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Merco 29 propeller recommendations
I have a Merco 29 diesel on a CL Wombat. It is ABC, Perry Ported. It runs very steady, but does not seem as powerful as I expected. What propeller would you recommend?
07-31-2013, 02:08 PM
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RE: Merco 29 propeller recommendations
ORIGINAL: controlliner
9X6
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07-31-2013, 03:41 PM
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RE: Merco 29 propeller recommendations
1. Plain case Merco 5 cc diesel;
2. Copy of manual page listing manufacturers propeller recommendation. 10 x 6 or 11 x 4 sizes are recommended.
Recycled, is the prop shaft thread on your later example 1/4 x 26 BSF?
2. Copy of manual page listing manufacturers propeller recommendation. 10 x 6 or 11 x 4 sizes are recommended.
Recycled, is the prop shaft thread on your later example 1/4 x 26 BSF?
Last edited by fiery; 08-19-2013 at 08:50 PM.
07-31-2013, 04:06 PM
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RE: Merco 29 propeller recommendations
ORIGINAL: fiery
1. Plain case Merco 5 cc diesel;
2. Copy of manual page listing manufacturers propeller recommendation.
Recycled, is the prop shaft thread on your later example 1/4 x 26 BSF?
1. Plain case Merco 5 cc diesel;
2. Copy of manual page listing manufacturers propeller recommendation.
Recycled, is the prop shaft thread on your later example 1/4 x 26 BSF?
I only posted that pic for clarity and the engine is not mine.
But whilst I am here again I have had talks with other very experienced CL fliers and they reckon that the cylinder taper was all wrong on this model - as in not enough pinch at the top end.
Cheers.
07-31-2013, 04:11 PM
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RE: Merco 29 propeller recommendations
That is unfortunate. New P/L sets for it would be like finding fresh brontosaurus by-product. Perhaps Mr Russell could assist in locating a source.
The plain case .29 diesel engine in post #4 is my own. It has an 'iron and steel' set up. Cross flow porting. Piston has a steep conical crown. Compression seal is excellent. Fits generally are good. The crank web is nicely counter-balanced.
The later black case versions were ABC.
A black case .61 diesel is shown below. It is ABC. Near new, it has noticeable pinch due to cylinder taper. It has a flat topped piston and 'vortex' style porting.
The plain case .29 diesel engine in post #4 is my own. It has an 'iron and steel' set up. Cross flow porting. Piston has a steep conical crown. Compression seal is excellent. Fits generally are good. The crank web is nicely counter-balanced.
The later black case versions were ABC.
A black case .61 diesel is shown below. It is ABC. Near new, it has noticeable pinch due to cylinder taper. It has a flat topped piston and 'vortex' style porting.
Last edited by fiery; 08-19-2013 at 08:44 PM.
06-13-2015, 09:15 PM
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Merco .29 shown in post # 4 has now been run.
Piston/liner and contra piston fits are first class.
An 11 x 6 Master Airscrew gf3 was installed for "first starts". It was too much prop for it.
I then put on a 10 x5 grey Robbe Dynamic gfk broad blade "paddle prop" on it. It was much happier. Video in link below.
https://www.youtube.com/watch?v=gTG-N1qTTng
Piston/liner and contra piston fits are first class.
An 11 x 6 Master Airscrew gf3 was installed for "first starts". It was too much prop for it.
I then put on a 10 x5 grey Robbe Dynamic gfk broad blade "paddle prop" on it. It was much happier. Video in link below.
https://www.youtube.com/watch?v=gTG-N1qTTng
Last edited by fiery; 06-13-2015 at 11:37 PM.
06-14-2015, 10:30 PM
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Hi Derek
My plain case version was so tight I had to damn near heat it up to turn it over!! I still havent finnished running it in. If I load it up it overheats very quickly, just needs many short bursts.
Would they produce enough power to fly a Nobler ARF??
My plain case version was so tight I had to damn near heat it up to turn it over!! I still havent finnished running it in. If I load it up it overheats very quickly, just needs many short bursts.
Would they produce enough power to fly a Nobler ARF??
06-14-2015, 11:46 PM
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Hello Brusta.
My example is set up tight. compression is huge after the piston closes off the exhaust by a couple of mm's. When running at near maximum compression exhaust still remained clear to tinges of light blue/green (kero. dye colour). After about 250 mL of fuel through it in several short runs the piston is a nice uniform grey finish with no 'tram tracks', scorch marks or shiny ring at the top.
I suspect It would fly a Nobler quite nicely
I may look through my assortment of 'bits' for old Merco's for a factory Merco C/L venturi and spray bar. I expect I would need to sleeve down the venturi a little to ensure good draw. With the R/C carb at WOT the venturi is a little large to ensure easy starting. Starting manners are better with throttle partially closed.
My example is set up tight. compression is huge after the piston closes off the exhaust by a couple of mm's. When running at near maximum compression exhaust still remained clear to tinges of light blue/green (kero. dye colour). After about 250 mL of fuel through it in several short runs the piston is a nice uniform grey finish with no 'tram tracks', scorch marks or shiny ring at the top.
I suspect It would fly a Nobler quite nicely
I may look through my assortment of 'bits' for old Merco's for a factory Merco C/L venturi and spray bar. I expect I would need to sleeve down the venturi a little to ensure good draw. With the R/C carb at WOT the venturi is a little large to ensure easy starting. Starting manners are better with throttle partially closed.
