2 engine progress

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beezer
Posts: 99
Joined: February 13th, 2012, 11:28 am

2 engine progress

Post by beezer » March 21st, 2020, 5:55 pm

some pix of progress. the skirt was getting ratty so to fix it I needed to take off the engine to flip it over. since the engine was going to be off I figured it was time to try it as a twin. I built the hull (16') with the fan deck big enough to be a twin, but ran it with a single 25 Kohler. last fall I bought a couple used engines & took them apart to do valves, gaskets, seals, rings etc. built a mount a fitted the engines at home in the (small) garage while the hull was in my friend's hangar. I patch the dents in the hull, cut out bad parts of the skirt & glued in more fabric, flipped it over & painted it. no attempt was made to get all the dents filled.... too many blems from years of being a working craft. the engines are both installed and the drive system is built. I'm on hold because if I put the drive on I won't fit under the wings & I'll have to move out. but its only a couple days work from here. the fan cage and guards are all that needs to be re-done. plus some minor repairs to the rudders & replace the plastic in the windshield.
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beezer
Posts: 99
Joined: February 13th, 2012, 11:28 am

Re: 2 engine progress

Post by beezer » March 21st, 2020, 6:07 pm

the two from last fall show the 'ol Kohler coming off (what a great engine!) the other two are the new install and mocking up the prop tower. it's actually a little farther along than this but I haven't taken any shots recently.
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Razataz327
Posts: 52
Joined: March 2nd, 2012, 10:44 pm

Re: 2 engine progress

Post by Razataz327 » March 25th, 2020, 1:52 pm

Hi On the plans it shows the opening for the lift fan to be moved forward 7 inches to accommodate the two engines. What else has to be adjusted? How about the main bulkhead in front of this? Does it get moved as well.? Did you move the front partition skirt back as well as the plans say to do with a twin engine? I am looking at doing a twin also. I am just in the frame structure part of the build.
Thanks for your help.
Garnet

beezer
Posts: 99
Joined: February 13th, 2012, 11:28 am

Re: 2 engine progress

Post by beezer » March 26th, 2020, 8:36 pm

yes, thats how I remember it... the rear "cabin" bulkhead moves forward, the aft bulkhead stays in the same location (part of which sets the overall hull length). if you build it for 2 engines, and mount 2 engines just go by the plans. I'm sure they are more refined than the ones I have. I don't think mine say anything about moving the partition. Barry told me to make a couple sets of hardpoints and see what works (I have 3 sets, so that may be what I was told).
I built my hull to take two engines, but only installed the one 25hp Kohler. It's going on 16 years now and just getting around to going twin engine. so can't help much with the twin since I've never built one (built 3 singles thought). anyway, if you want to do what I did, then a few other things need to be changed and I can give some pointers. in any case it would be nice to have a little more room back there for the 2 engines, but its a balancing act and moving one thing affects other things. I'm using a 16 Kohler for the lift engine and installed with the cylinder facing forward which gives best clearance to the other engine (nothing in the plans about that). I ended up having to modify an exhaust to fit though because on that engine, even though there are several factory exhausts, most protrude down. thats hangs where the lift fan runs. only a couple exit "up" and they bolt on the area of the valve cover, pointing forward. better to mount the engine with the cylinder pointing to one side, there is no room to point it aft.

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