carlbecker

My Feedback: (3)

I plan to make a trainer DF out of a highly modified 120 Lanier stinger. I want to mount the engine (K&B .82-dynamax) on top of the wing. What dimensions should I make the inlet and exhaust for the DF unit?

I have read the inlet should be about 100% +- 10% of the fan area and the outlet about 10% smaller. Is there a good rule of thumb for length in front of the fan and behind?

The goal will to train to fly a 1/5 HE-162 at 15 pounds built from VTH plans balsa, ply and glassed.

Thanks Carl

donniercjet

My Feedback: (10)

for something like that i would set the fan as close to the front as possible a inch inside the inlet would be ideal you can draw all the air your fan can suck in for the thrust tube (aft of the fan) do you want the pipe concealed?? if i were to build this setup i would make the thrust tube around 16 to 20 inches long my mig-15s thrust tube is 26 inches long start out with 5 in. (dynamax shroud) and exit with a 4 1/4 to 4 1/2 inches if your flying off of grass if you have a hard surface (concrete etc...) i might even go 4 inches at the tail thats 20% less than the fan diameter good luck with your project lets see some pics when your finished donniercjet

Ram-bro

My Feedback: (101)

carl,Balsa USA sells their enforcer setup for a Byron fan. They have a cowl unit that would be simple and clean to make for a HE-162 setup. It uses the os91 and byro fan at about 13lbs thrust. I am not sure if the plans are sold with theenforcer or if it is a n aftermarket setup.

carlbecker

My Feedback: (3)

I found a BVM setup for the HE-162. 13 pounds of thrust. I fly off of grass only.

For this DF Stinger its just something as cheap as possible to get some experience with DF. I don't care about looks in the least. I was thinking about trying to copy somewhat the feel of the HE-162 so I should mount the fan very close to the lip and have a longish tapered outlet?

I wore out a Stinger but really liked it and its pretty cheap so I thought I might really get into trouble doing this.

Carl

Ram-bro

My Feedback: (101)

This going to lead to another "Becker Originals" that we can look forward to in the future?

carlbecker

My Feedback: (3)

I'm not sure what it will lead to but it might be "interesting"[:-]