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DLE 20cc Gas

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Old 01-20-2011, 12:40 PM
  #1
SpinnerRow
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Default DLE 20cc Gas

Vess 16x8 - 8600
Vess 17x6 - 8400

I'm running WalMart Supertech oil at 30:1.

I'll be trying an APC 15x10 & 15x12 pattern props this weekend and will post up the numbers.
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Old 01-20-2011, 12:44 PM
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Default RE: DLE 20cc Gas

Pretty good numbers, pretty much the same as the CRRC 26cc.
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Old 01-22-2011, 12:01 PM
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Default RE: DLE 20cc Gas

The numbers in the first post were with a Jtech Standard size wraparound pitts muffler. These are with a compact wraparound pitts muffler:

APC 15x10 Pattern: 8800
APC 15x12 Pattern: 8050 to 8100
Vess 16x8: 8300

Looks like I'm losing about 300rpm with the compact pitts and the first thing I had to do was lean the motor out some because of the increased exhaust back pressure I'm assuming.

The 15x12 sounded labored to me and I'm thinking that if I could run the standard sized pitts, it would put this motor in the sweet spot. But I'm going with the 15x10 for my World Models P-51. The little motor sounds awesome at 8800. Have no idea what it will unload to in the air but it should haul ass!
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Old 01-22-2011, 12:42 PM
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Default RE: DLE 20cc Gas

RPM's are like HP ratings, basically there for bragging rights, nothing more.
RPM's will vary with humidity, temp, altitude, fuel/oil mix ratio, and air/fuel mix.

Static thrust will give you much better info for comparisons, but it too changes once airborne.

Here's the thrust figures others have already posted for the DLE20 gas engine;

APC Sport 16x7 9000 RPM 14lbs. 7oz.
JXF Beech 16x8 8300 13lbs. 10oz.
JXF Beech 17x7 7970 13lbs. 12oz.
SY 16x8 8500 13lbs. 5oz.
SY 17x8N 8200 14lbs. 9oz.

Vess 17x6 14lb. 8oz. - Great throttle response and crappy tach showed 8549RPM
Vess 17x8 14lb. 0oz. - Great throttle response only slightly less RPM than 17x6
Vess 18x6 14lb. 3oz. - Above average throttle response, may be perfect when fully broken in
Vess 16x8 13lb. 9oz. RPM through the roof (by ear) and instant throttle response spools up like an electric motor!

Zinger 16x8 - stinks, no power, way low on thrust
APC 17x4W 3D prop - decent but the idle transition was terrible, 9700 rpm!
Xoar 16x8 - Good prop but not as much thrust on the high end as the next one...
Xoar 17x6 - Hands down the best prop so far. Great punch out of hover, great top end, improved low end but more to come on this....

MA K-series 15x8 2 blade- 13lbs 11oz @ 9750 rpm.
MA K-series 15x10 2 blade- 12lbs 13oz @ 8400 rpm.
Xoar 15x8- 13lbs 5oz @ 9000 rpm.
The MA 15x8 and Xoar 15x8 have unbelievable throttle response

MA K-series 15x6 3-blade 13.0lbs @ 9100 rpm
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Old 01-22-2011, 02:31 PM
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Default RE: DLE 20cc Gas


Quote:
ORIGINAL: a1pcfixer

RPM's are like HP ratings, basically there for bragging rights, nothing more.
Uhhhh, this is the Tachometer Forum.....
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Old 01-22-2011, 03:48 PM
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Default RE: DLE 20cc Gas

Spinner,

What size is your P-51? It should be a blast with a 15x10 at 8800. Usually the engines gain rpm's in the air based on my experience.. especially with a P-51. I was using an apc 14x10 and 14x12N before.

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Old 01-22-2011, 07:59 PM
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Default RE: DLE 20cc Gas


Quote:
ORIGINAL: ton2di

Spinner,

What size is your P-51? It should be a blast with a 15x10 at 8800. Usually the engines gain rpm's in the air based on my experience.. especially with a P-51. I was using an apc 14x10 and 14x12N before.

ton2di
World Models .60 size.
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Old 02-23-2011, 03:58 PM
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Default RE: DLE 20cc Gas

i wouldnt expect a lot of gain "unloading" many would be suprised by telemetry readings and the sound it makes in the air. I could the engine unloading more with the 8" pitch prop.

By the way a bone stock OS120 AX with baffle in the muffler turn a APC 16x8 prop at 8,400
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Old 02-23-2011, 04:54 PM
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Default RE: DLE 20cc Gas


Quote:
ORIGINAL: airraptor

i wouldnt expect a lot of gain ''unloading'' many would be suprised by telemetry readings and the sound it makes in the air. I could the engine unloading more with the 8'' pitch prop.

By the way a bone stock OS120 AX with baffle in the muffler turn a APC 16x8 prop at 8,400
Yea, a DLE 20 is definately stronger than the OS.
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