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DLE 61 - not impressed so far

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Old 07-31-2019, 01:28 PM
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Chris Nicastro
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Default DLE 61 - not impressed so far

Hey guys, anyone with experience on the DLE 61 care to share your set up and experience so far?

I have a new one installed in a TF Corsair. Has 6 flights on it so far.
This plane has been flown for many years and originally with the 55RA, Saito FG 84 and now the 61.
I think the 55RA has more power and top speed with a Xoar 22x10 than the 61, am I wrong?

Gas - 91 non-E
Oil - Klotz Technoplate
Ratio - 34:1
Plug - NGK CM6
Gap - .22
Prop - Xoar 22x12, 23x12, and a Mejzlic carbon fiber narrow blade 24x10

Modification - aluminum velocity stack on the carb, reed block sanded flat and reeds adjusted to seal better, diaphragm pump air tube

This my standard level of prep for all my DLE engines from the 20RA, 35’s, 55’s and now the 61. I’m just not seeing the top end I was expecting. The cowl is well ventilated, like I’ve done before, in fact more flow now than when I had the 55RA in there. I’m not seeing overheating issues.

What peak RPM’s are you seeing?

What oil/gas ratio are you using?

What prop does this engine like?


Thanks!





Last edited by Chris Nicastro; 07-31-2019 at 01:32 PM.
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Old 08-02-2019, 09:13 AM
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Truckracer
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I've flown several DLE55s and the DLE 61 and like them all. The 61 does have a very different personality than the 55 though with the 61 being more of a torquer than a horsepower engine. By that I mean the 61 is happier turning larger diameter, lower pitched props where the 55 likes a bit less prop load and likes to rev a bit more. I won't go into further detail but the 61 wouldn't be my choice for a warbird engine where prop pitch and speed are important. There are better alternatives such as the GP61 that likes to perform at the top end but lacks the mid and low speed manners where the DLE61 excels. Every engine design is a compromise.
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Old 08-06-2019, 12:21 PM
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I'm willing to bet that the 55 runs a higher compression ratio and benifits slightly from the use of the 91 octane where the 61 twin does not.
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Old 08-07-2019, 05:05 PM
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Chris Nicastro
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The 55RA engine layout is also much better than the typical side exhaust. That was make clear to me when running bother versions of the 55. The best combo I found was the 55RA and Xoar 22x10.

The 61 with the Xoar 23x10 seems to do alright in the Corsair. The climb out is pretty good but the top speed is slower.

I have ave two of these 61’s does anybody want the new one?
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