DA-70 and Plane Bender Smooth Pipes

[Bdegan]

Ok Boys and girls.

Crack open a cold one and sit down LOL :very_drunk:



I had the chance today to finally test my DA70. I did a run up on a few props with the stock mufflers.

Then I did some header length testing with the Plane Bender Smooth pipes.



Here are the basic results







Stock Muffler



Falcon 25x8 wide = 7050...



Falcon 24x10 = 6930



Falcon 24x9 = 7380 ( not sure about this reading )



Beila 24 x 8 = 7020



Most of these stock muffler numbers are better than most of the piped numbers on the other 60 cc engines myself and Tbrum have tested.









Tuned Pipe



Falcon 25x8 wide = 7530 @ 8.5 inch header



Falcon 24x9 = 7480 @ 8.5 inch header









Here is the video of the final run up with the 25 x8 wide Falcon.

 

[Bdegan]

The MTW headers that I got from DA are 10.25 inches in length.

Set with a 1/4 inch gap gives a header length of 10.5 inches. Consider that the stock bolt on pipe set up.

RPM increase over the 7050 stock muffler result was only 7110. An increase of 60 rpm. So I had to start cutting the stainless header to see what would happen.

The results are extremely positive.

 

[Geno]

That motor sounds awesome!

 

[ericb]

Holy crap!!! That is an awesome setup.

 

[ericb]

Do you guys have a way to measure thrust? I am interested in those numbers.:tennis:

 

[Bdegan]

Hi Eric,



If I had it in an airframe I could do a rough thrust measurement for you.

But for now, the stand isn't set up for thrust measurements.



that's actually a project for this winter. That little test stand is getting a redesign this winter.

it's going to get redone to be able to record thrust. Also the motors will mount so that the pipes will he on top. Much easier and faster for header length changes.

 

[ericb]

Sounds good. I will be watching with anticipation. I was thinking a light 100CC'ish airframe might be a good candidate for this setup.

 

[Bdegan]

ericb;9827 wrote: Sounds good. I will be watching with anticipation. I was thinking a light 100CC'ish airframe might be a good candidate for this setup.

Mind reader ... LOL



That's what I am thinking for this winters build project :nodding-yes-by-a-ve

 

[Ohio AV8TOR]

This is a nice setup that I saw. I sure wish one was available for the VVRC40 too.

 

[ericb]

Bdegan;9831 wrote: Mind reader ... LOL



That's what I am thinking for this winters build project :nodding-yes-by-a-ve

From seeing your builds in the past, this will be awesome. You will have to talk Terry into doing a build like that also so I can see it first hand.