What Engine for DF.?
 

Helicopter engines are tuned to operate in the 12K to 17K range, depending on the particular engine.

Currently available fans operate at well over 20K. The heli engines would be well past their power peaks. You could do some grinding on the ports to get the power where you want it, I suppose. Some experimentation would be required, and possibly more than one engine before you get it right.

engine rpms
 

looking at some info from about 1990 out of a Byron kit it shows then rpm max speeds of 16k to 19k for the then present setups. these numbers are for the early 61 to 65 size engines. That was of course for a Byron fan unit. So would a present day heli engine made to turn a max 18k work in their place? Is a heli engine ported different than a plane engine of the same size for different power bands?? For instance MDS sells several engines in the same size for both. Only apperent difference is the bigger head. Isn't 18k a respectable rpm for a guy who doesn't care to rip the sky apart. Just wants to have an easy going jet?

New to jets
 

Hi,I just got into jets last year and all of you guy's on RCU have helped me out(A lot of info) and I thank you.The only engines I am runing now is the Rossi's and that I will be buying from now on is the Rossi's and BVM's.I Like the ducted fan's and will most likely not get A turbine becouse I canot aford it. Please keep the info coming and I wll always read it.I have three jets now and I am still buying more stuff to finish them.One is done,one I have all the parts for and the next one I need more parts for it.I know you guy's like the OS but I will stay with the Rossi's and the BVM's and I know somone here goes only by OS but he shure like's to bid A lot on Rossi's on Ebay,I wonder why?,Thank you.

Re: engine rpms
 

The early byron planes flew with all sorts of weird engines, before purpose-built DF engines were available.
I'm sure you could get your airplane airborne with a heli engine, but I think you will be a lot happier with a purpose-made DF engine and a proper tuned pipe.
If you are on a budget, there are bargains to be had, especially on Rossis.

Mac, you mean me? I did bid on a Rossi 105, never had one, heard one guy say it was okay on the Byron...if I got it for a bargain, I would try it out. That 6.15HP at 24,000 revs is just too tempting, though you rarely hear anything but awful things about that engine!

DF engines
 

Thanks for all the information on choice of engines. I'll look for a couple of OS .91's. Large head preferred but will settle for small head.
Do any of you have any recommendations for my completion on my Byron F-16 or TGA F-15. Both have Byron fans. This would be my second attempt for Ducted fan planes. My first was a Parkinson Regal Eagle several years ago. I'll be hoping to fly them off our grass field. Is this possible. I have spring air retracts for both. Any suggestions would help. Maybe I'll get bit by the DF bug and stay this time.
Thanks,
Bob

Small head DF engines
 

Pilots,
believe it or not-small head engines WILL work on a Byron fan set up-I have run Rossi and OS engines with small cyl.heads-and they DID NOT overheat-you just have to make sure that you do not run them too lean.Use a on board mixture control. and contrary to what some people have said-the Rossi df engines are very,very good-you just have to know HOW to set them up and run them right.What I do with any DF engine I have is-take it completely apart-check it for F.O.-then make sure the front and rear bearings are "seated" properly-this step alone can give you a extra 1000 rpm-use red Locktite on all the case and carb. bolts-blue Locktite on the cylinder head bolts.If you don't like the Rossi carb-you can adapt a OS.91 carb to the Rossi engine-makes a great engine even better.I use Powermaster 15% with a extra 6ozs. of castor oil and 2 ozs. of Exxon 2380 turbine added.My engines run great.

Jackjet

Hi Scott
Do you still have extra big head for an O.S. 91 ?
Thanks

OMG what a great thread! Telling Dennis Lott how to run a Byron fan!!

Great!! A 15 year old thread reopened. Wonderful.

Convert to turbine power. :-)

Ahhhh, I miss Easytiger.

I sent you PM