ya33a
Posts: 163
Score: 100
Joined: 2/12/2005
Last Login: 5/30/2013
From: BrisbaneN/A, AUSTRALIA
Status: offline
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Hi,
Glad you like my assembly of the Su26, I originally bought it for a 26cc weedeater I converted, but when I bought the 325, I just knew it had to go in there instead.... Then I had to make it fit...?!?! the OD was identical to the OD of the engine...hummm.. 3 months of thinking and 5 minutes with a thin blade inthe grinder and hey presto a cowl that fits the engine and has cooling holes... I don't care that it pokes through a bit I was molding up some blisters but after a couple of goes that didn't work out I just went nah, it looks ok as it is and the close fitting cowl looks great hugging the engine. I always paint the inside of my cowls and fire walls, to help with fuel proofing and it also finishes it off better. I screwed the engine directly to the firewall and cut the carby hole bigger, the firewall is also reinforced with metal tek screws that go 1/4 of the way into the ply so it will stop the engine pulling the firewall out of the airframe, I won't be doing 3D so it should be fine, I'm also considering galssing the whole front but the thing is so nose heavy now, I was able to move the cowl back 1/2" to 3/4" (13mm to 19mm) which should help. so I'll be rear mounting 3 HD servos and have the battery etc well behind the COG. I painted the silver landing gear red because it looked cruddy and fitted a couple of spatts off an old ARF, I need a 3 blade prop which is 1" to 2" smaller (25mm to 50mm) with a big pitch so the engine can tick over and sound throaty plus won't self distruct on the first landing.
I bought the microsens onboard glo about 5 years ago - I bought 3 of them, can't remember why I did that, but I have a couple of spares now. It looks straight forward to setup and I just need the right sort of power supply now.
The pilot is the 1/4 guy from my H9 Taylorcraft and his hat matches the paint job pretty well I think, I also used some car pinstripe tape on the canopy to hide all the white which looked dodgy, I'm chasing heaps of 'sponsorship' stickers now to plaster all over the plane.
The engine came with the Kelio exhaust ring, I had to 'persuade' it onto the engine, (I used a round steel rod and gently adjusted each pipe about 0.5mm (1/64") at a time to make it fit perfectly before finger tightening the nuts to the head, then I realised that the pipe sticking straight down would be vulnerable to my usual arrivals, so I took it off and moved it 1 pot to the left which means it's coming out of the plane just over the starboard wing, I don't think it looks that bad and the overly large hole lets plenty of heat out, (that's my justification for the way I messed up with the grinder but I'll get over it)... I then went beserk and cut all the louvers out with the grinder which also should help with airflow, I think it's a ratio of 1 to 3 or 1 to 4 for cooling, for every square inch (cm) of air intake you need 3 to 4 times the amount of exhaust air, otherwise the air 'boils' and then the engine won't run anymore.
I still have heaps to do but can't wait to get the engine running, I was considering converting it to gas, by tappng the heads to take the Saito spark plugs and using a hall effect unit to trigger it, but I can't find ayine who can advise me on where to find a spark unit to suit, I don't want to put in a distributor and mess around with all that, I just want to get a plug and play option with minimum of engineering, I can drill the prop driver and install the pick up and drill and tap the heads but trying to set up a distributor...hummm.. I was hoping to find a 5 cylinder electronic distributor that can be fired off the single pick up and swap the leads around to suit the firing order of 1, 3, 5, 2, 4. any tuning would take a few seconds to pick up but so what, I'd be willing to sacrifice that for ultimate reliability, I would also shim the barrels to drop the compression down so it would run on high octane pump gas. My reasoning is the FG20 in the Taylorcraft is just so, so nice doing a slow flyby putting along at tickover then opening the throttle knowing it will always pickup and fly away...
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RE: Everything Radial Engines - 
