stunthanger.com

Engine basics => Engine set up tips => Topic started by: Glen Alison on December 02, 2011, 01:51:55 PM

Title: Set up for Ro-Jett 61 on header muffler
Post by: Glen Alison on December 02, 2011, 01:51:55 PM

Hello everyone, I am seeking advice on the best set up for a Ro-Jett 61 fitted with a header muffler. Preferably running on a two four run. Usual 50/50 fuel with 5% nitro. What props, take off revs, venturi size, head shims etc etc seem to work best for you. Thanks for any input.
Glen Alison (UK)

Title: Re: Set up for Ro-Jett 61 on header muffler
Post by: FLOYD CARTER on December 03, 2011, 02:45:48 PM

Glen.  I don't think there is any need to modify the RO-Jett 61.  This is an example of a "purpose-built" stunt engine that works best on a solid 2-cycle run with 13" and low-pitch prop.I haven't seen anyone try for a 2-4-2 break.

Floyd

Title: Re: Set up for Ro-Jett 61 on header muffler
Post by: Balsa Butcher on December 04, 2011, 03:42:13 PM

I run RoJetts on a pipe and manage to get a slight break in the runs. No changes necessary to the engine, just bolt on a header muffler, mount on a test stand, start with about a 12x4 APC prop and see how it runs. Don't mess with the set-up, as has been mentioned, RoJetts are optimized for stunt from the get-go. I have the best runs using 10% nitro, 17% synthetic and 5% castor fuel. The usualy 11/11 lube is too much castor for these engines.  8)

Title: Re: Set up for Ro-Jett 61 on header muffler
Post by: Bill Little on December 04, 2011, 03:44:21 PM

I agree with the guys.  There should really be nothing to change to run the header muffler.  ???

Big Bear

Title: Re: Set up for Ro-Jett 61 on header muffler
Post by: Gary Anderson on December 05, 2011, 05:50:26 PM

Hi Glen,
I run my RoJett 61, Brett Version, on pipe.  When I was flying a few weeks ago the header broke at the engine. The RoJett didn't seem to care she kept running is a nice sound and didn't seem to have any power lost?? I believe this engine could run anyway ya want to run her and you will have a winner?? I would say if ya want to run her on a muffler type set up, go for it. I also have the muffler for this engine. My brother bought the whole set up from Dub Jett and I just have never tried it on the tube muffler???

Good Luck
Gary

Title: Re: Set up for Ro-Jett 61 on header muffler
Post by: Glen Alison on December 08, 2011, 07:47:47 AM

Thanks to all that responded to this enquiry. I have attached a pic of the KA10 the engine is in.
Regards to all, Glen Alison

Title: Re: Set up for Ro-Jett 61 on header muffler
Post by: Bill Little on December 08, 2011, 03:45:17 PM

Quote from: Glen Alison on December 08, 2011, 07:47:47 AM

Thanks to all that responded to this enquiry. I have attached a pic of the KA10 the engine is in.
Regards to all, Glen Alison

HI Glen,

Nice looking KA-10.  Which drawings did you use?

I had Eddie Taylor at Lazer Works cut me a short kit from the Model Aviation plans done by Tom Dixon.  I will be using a Discovery Retro .61 in mine.

How does it fly?

Thanks
Bill

Title: Re: Set up for Ro-Jett 61 on header muffler
Post by: Glen Alison on December 09, 2011, 04:07:54 AM

Hello, it was built from the Tom Dixon kit with false rib caps over a foam wing. It turns superbly and comes out of the corners really flat with no bobble. Does tend to wind up a bit in windy conditions but I find the best technique is to walk towards the model when this is happening.

Regards, Glen

Title: Re: Set up for Ro-Jett 61 on header muffler
Post by: Bill Little on December 09, 2011, 12:53:47 PM

Quote from: Glen Alison on December 09, 2011, 04:07:54 AM

Hello, it was built from the Tom Dixon kit with false rib caps over a foam wing. It turns superbly and comes out of the corners really flat with no bobble. Does tend to wind up a bit in windy conditions but I find the best technique is to walk towards the model when this is happening.

Regards, Glen

Thank, Glen.  I am looking forward to being able to really get back to building soon and have my own version in the air. ;D  (at least I am 1/2 way through my cancer treatments, should be over in early March!)

I think I will basically copy Anatoly's paint scheme, maybe not "QUITE" as busy. ;D  The Discovery Retro .60 should be enough engine I think.

Big Bear