VVRC 40cc Twin

[Ohio AV8TOR]

No proof personally but there are reports of +200 rpms with the 1/4" plugs.

 

[Bartman]

huh, you don't say....i posted to the classifieds to see if anyone has a good used one for sale. i'd buy either one at this point but thanks for the info. have plenty of room for either.
bart

 

[PaPa-Doc]

What props have you guys settled in on with the VVRC40?

I'm using a Vess 20B prop on my VVRC 40 Twin in a 3DHS BigFoot. 51 flights to date with no problems.

 

[Whidbey1]

I have prototype jtec mufflers on my vvrc40, it is much deeper tone and a lot less noise

 

[Alky6]

Have you had a chance to compare power to stock or sound level difference (measured)? They look good!

 

[Bartman]

View attachment 4191 I have prototype jtec mufflers on my vvrc40, it is much deeper tone and a lot less noiseView attachment 4191

can you post a pic of the stock mufflers next to the jtecs?

 

[Whidbey1]

here is the side by side shot

 

[Bartman]

ok, thanks @Whidbey1

 

[Ohio AV8TOR]

Video please so we can hear.

 

[Alky6]

I got the 2 into 1 header and pinacle can for Christmas. Installed it in my EF 78 Extra. Here are some pics of the install. Didn't take any dB readings, but I do have some rpm on ground in air. Two separate days but very similar atmospheric conditions. 20x8 Xoar Laminated. 6900 on ground and 8,000 in air (flying level) peak with stock muffs. With can set up, 7,100 and 8,600 rpm respectively. Required two blade widths richer on the high side. Moved the throttle servo around so it didn't get cooked by the header (less than an inch away). Still have to get my throttle curve worked out, but it is close. The throttle linkage shown is temporary and was for proof of concept. It is being replaced with a solid piece of 4-40 rod.