hpergm

The Japanese gyus use the stock spiral exhausts.

If you want real sound, go with Keleo
https://www.youtube.com/watch?v=Zd1HBeBMQQI Some more inspiration : https://onedrive.live.com/?cid=5efdf...N7hWVMI45AyIiY

slither

Do you have a parts list? What diameter did you use? Sounds great! Were the segments pre-flaired? Did you use silver solder?

marksp

My Feedback: (9)

I have the Keleo ring and based on the video, your setup sounds much deeper! Fantastic!

flypilot

Hi all,
Used these parts:

5 x https://www.krumscheid-metallwaren.d...ng=EN&anr=1410
4 x https://www.krumscheid-metallwaren.d...ng=EN&anr=1450

Used silver solder to make it and used the flextubes that came with the engine to mount it, silversoldered them too.

helinut1

Hi all
Got a lot of info from your thread so I thought I would add some back. A couple of months ago I got a Saito FG-60R3 with a specific project in mind. I am building a T-28 80 inch and wanted a radial to go inside the cowel run great sound great and have scale exhaust and prop. My project led me to a Saito FG60 engine . I then read your thread and decided to get the engine and see if I could solve some of the problems tunning . I have talked with Morris from Morris Mini Mototrs and he agreed to making me a Walbro carb set up and adaptor for this motor. i have now got the motor running with this carb and it is fantastic. tunning is easy with a high and low speed needle ,an idle stop screw and Adaptor that they made me. Pulse is from intake pulse that the adapter provides and works great . After breaking in the motor I am getting very even temps on all cylinders and runs fantastic . with a 22-10 APC prop I get 7000 RPM ,i tried to richen as this is at the high end of the range but all it did was start to run bad . I thought it was going to lift the table I had it tied down to. Hope to post some pictures soon and get this plane in the air it should screem in a 23 LB plane. I am also running a Kelio exhaust ring that we customized with 3 outlets on both sides at the scale outlets for the plane . the sound is perfect for a radial scale plane.

marksp

My Feedback: (9)

Right on!

SWORDSN

My Feedback: (13)

Which T28 kit? I hope that you will post some pics of your build as I am in the planning stage of a similar project.

snickarn

Krumscheid also got big bends to do your own ring. Art.nr 1480

helinut1

Swordsn if you got to the airplane thread on RCU called T-28 build at the end you will find my plane and if you read this thread it is full of information on ESM T-28 and is very helpfull with this build.

johnhi

I flew my FG60 yesterday for the first time, it certainty has plenty of power and is very similar in performance to a DLE 55. I'm running 15:1 mix. High speed needle is out 1.25 turns and Low speed is out 6.75 turns but it was still a bit rich on the low end so I will adjust this in the next few flights. I'm using a 23x8 Bela prop and got 6,200rpm

I used plenty of baffling in the cowl and put louvered vents behind each of the cylinders just to make sure everything stays cool.

slither

What are the specs on the plane? Post a video or two... looks great!

snickarn

An video of my Saito FG60R3 in ESM Focke Wulf 190 D9.


https://www.youtube.com/watch?v=7rVvrfAELoQ

hpergm

One more: first flight of a Top Flite FW190A with an FG-60R3.

https://www.youtube.com/watch?v=x_MYY0NlbQY Prop is an APC 22x10 with a top end of 6,800. Mix was 1:20, using Castrol Synthetic. The engine tuned easily (6.5 turns out on the low and ~2.5 turns out on the High) and Ran like clockwork.

The on-board telemetry sensors for temps (1 per cylinder) showed only a deviation of <2degrees C on the ground (idle) and in flight for (mid-range)..! Seems like the careful running-in (see previous posts) paid dividents.. Temp range was between 80-90C on the ground.

Note: readings are taken between the fins just below the spark plug, on the rear side (to avoid speed/cooling effect of oncoming airflow). In reality, CHTs will be 30-40C higher on near the top of the combustion chamber.

A +20C difference between Nos 2&3 and No.1 (top cylinder) was recorder after prolonged mid/high throttle settings in the air. This was expected due to the relief airflow arrangement in the cowl (louvres only on the bottom side for scale reasons suck more cooling air around the bottom cylinders...).

A Happy customer!

SWORDSN

My Feedback: (13)

Great first flight hypergm. How much break-in before first flight and what was your total weight?

hpergm

Thanks Swordsn. Actually I took my time getting to know the motor - please refer here:
http://www.rcuniverse.com/forum/gas-...l#post11955975

Total of 5lt of fuel, more than 3-4hours running in total and careful balancing of cylinder compression in the beginning.
Really paid off - engine tuned 1st time on the plane (knew what to look for).

Plane is ~26.5 lbs. The APC @ 6,800 gives about 1:1 thrust ratio.

Hector.

SWORDSN

My Feedback: (13)

Thanks, I will also follow that thread, What do you mean by"balancing of cylinder compression"?

Alex70

Great nine cylinder dummy Hector, just need a little touch of paint for get it perfect.

Regards.

hpergm

Means that during rich break-in, the 2 bottom cylinders will only be firing intermittently mainly due to gravity effects (i.e. more of the rixh mixture will go down, flooding the spark), so their temperatures will also be down. This leads to limited piston expansion, which in turns delays the raise of compression in the cylinder (via ring seating, etc). This then means that the bottom cylinders will be "sleepy" for a prolonged time. In flight, the plane rolls, so slowly the cylinder will eventually balance out - but why risk loss of power and possibly flame outs in the first flights??

The way to re-balance compression safely on the ground is to make sure the cylinders fire and expand (heat cycle) properly. We do this by rotating the engine on its mount every tank so that each cylinder in turn is oriented in the top position (becoming leaner, thus firing more evenly, thus hotter = more compression build up).

Makes sense?? Also look at the long discussion in the Gas Radials thread from its beggining.

CRG

My Feedback: (3)

I'm struggling with the logic behind rotating during break in on the bench. Surely induction pressure far outweighs gravity on such minute amounts of fuel.

hpergm

You are right - but only under "normal" running tune. Rotating is only meant to work out during initial breaking-in which means too much fuel and too low rpms and no ring seating... After 1 cycle, it no longer has a meaning. And remember, it only accelerates the heat-cycling of the lower cylinders - one can also live without it.

SWORDSN

My Feedback: (13)

It makes sense...Thanks

CRG

My Feedback: (3)

I'm still not buying it. Millions of radials engines around the world have been broken in in a fixed position, without any "risk of loss of power and flameouts".

Zeeb

My Feedback: (41)

+1.

While I think everyone ought to proceed in which ever direction he/she'd like, these things are just toys and at some point all this monkeying around takes the joy out of things for lots of us. Trying to propagate a theory that's pretty thin at best to those who do not now enough to question it does them a disservice.

I was on a thread the other day where a gentleman said you needed an oscilloscope to check servo current draw, 'bout the same type of idea here....

hpergm

Gentlemen - each to his own.

As I said, the world can live without this temporary "trick"- it's just there to save time and wear and maybe reduce first flight risk.

For me it worked OK; its no theory - I think also other people have adopted it successfuly in the Gas Radial thread.

Thanks,
Hector.

johnhi

Hi Hector, the FW190 looks amazing, and sounds great. I'd just like to say thanks for the advice you gave when I was running in my engine, it made the first flight a lot less stressful especially knowing that the engine had been fully run in and set up correctly. This should now give me many hours of fun.

My advice to myself always is, if you are going to do something do it properly.