Posts: 54
Joined: 11/14/2003 From: Grand Rapids,
MI, USA Status: offline
Octanehuffer,
I use the Bolly CF props. They come in a nice wide variety of sizes to meet any need. And they are solid carbon fiber so the can be modified as necessary (ie: shortened, tips shaped).
I found I can run a bigger prop. With an OS46 AX and 30% heli fuel I went from an APC 12.25x3.75 to a Bolly 13x4 and I am still getting just over 12500 rpm. With a YS140 and 30% fuel I went from a APC 18x6 wide to a Bolly 19x6 which was modified to 18.5x6 with a tip shaped somewhat similar to APC's (Had 2 previous Bolly 19x6's that I was able to leave stock size and tip shape and still get the same 9000 RPMs). Bolly's blades spool up is quicker than the APC as the CF props are lighter.
Posts: 655
Joined: 7/15/2006 From: Lakeland,
MN, USA Status: offline
Plane is enroute. Will be here on Wed. Got all the servos. Hitec HS-85BB for surfaces and HS-55 for throttle. Electron 6 reciever. 4oz tank. Large Du-Bro horns. Li-Poly 7.4v 640 mAh pack with a Novak BEC regulator. 11x4 and 11x5 props to experiment with. I dont know wether to invert or side mount the engine yet. Any suggestions? Adam
Posts: 349
Joined: 10/31/2005 From: , NJ, USA Status: offline
I side mounted mine. I had problems with the servos i bought, thats why mine isnt done. For some reason they dont center all the time. Im not sure if its because of the pull pull setup or what.
Posts: 655
Joined: 7/15/2006 From: Lakeland,
MN, USA Status: offline
I am to side mount mine as well. I have a Slimline pitts muffler here and its .5 oz lighter than the factory one. I have so many parts its hard to remember what I even have anymore. Corrected engine weight with muffler is 12.1 oz. Also the regulator I am using is .3 oz instead of 1 oz. I am going to call Davis Diesel tomorrow and see if they would recomend converting the .32 to diesel. They make a head for it and the cost is 54.98. Benefits are = more power, longer run time, cooler temps, cheaper fuel. Davis recomends starting with a prop that is 30% larger than factory recomended as a starting point. That would put it with the 14" prop and approx 50% longer run time. Or carry less fuel(weight) and get the normal times. We shall see. Adam
Posts: 655
Joined: 7/15/2006 From: Lakeland,
MN, USA Status: offline
Got mine started. Cut the engine box and have been mocking everything up. The engine is in place and thrusts are set but will wait to hear back from Quique to see what to glue it at. I knid of want to set back the engine another 1'4 inch and get the carb barrel into the cowl but the more I look at it the more I like it where it is. The prop hub is at the same distance as the EP version. I cut the engine box 2.5" back from the firewall and slid the whole thing on the cut portion of the rest of the box. Very strong!!!! Will not have to add any extra material. I dont even have it glued yet and there is alot of pressure required to move it. Not a forced fit but rather snug. I will continue to mock with the current set up and continue the cowl cutouts and devise some sort of solution for baffeling. i will also cover the fuselage from incoming air. use clear tape or Ultra cote. In the center of the fuse I will do it the same as the 86" Yak and make a wood frame to get slid into place to block the air. I also have a very easy solution to the landing gear failure potential. When I get the proper hardware for it I will post it. Adam
Posts: 655
Joined: 7/15/2006 From: Lakeland,
MN, USA Status: offline
I really need to quite working so hard and focus time on these airplanes. I finally got around to this, but the gear solution is really simple. Run a longer bolt all the way through the t nuts and above the fuse floor. Tighten the bolts like usual. Then glue a plate that will box it all together and add your nuts(hardware nuts for all you sickos!) This will tie the gear not only to the bottom of the fuse where the factory location is but also to the top of the gear plate. Boxing the whole structure together. There would have to be some very severe impact to disturb it. Simple, lightweight, strong. I am hoping to have it built enough tonight so I can weigh it. Throttle is set up and still have to cut the over hang on the engine mount, so I am still looking to remove weight. Also waiting for the Titanium mount bolts to arrive. Gonna replace the engine mount, muffler, landing gear, and axle bolts. The fuel tank will sit on the "floor"" directly above the langing gear and up agaainst the wing tube. The height is exactlty at the OS recommended specs for 5-10mm to center of the carb. Adam
Posts: 655
Joined: 7/15/2006 From: Lakeland,
MN, USA Status: offline
My guess is Slimline. I have had it on the shelf for 5 years from a previous custom build but didnt use it. So lets hope my memory isnt shot yet. It is also lighter than the factory pipe. The main reason I decided to use it. I tore the plane back apart but will show some more pics later with the cowl on and cut. I realized that the fuel tank location was ahead of the CG. I need to find a way to mount it on the wing tube and make sure that the fuel tank height wont be a problem. Adam
Posts: 655
Joined: 7/15/2006 From: Lakeland,
MN, USA Status: offline
I have most of the plne together now and am very happy with the dry weight of 49.6 oz! I still need the Titanium hardware to save another 1/2 oz, but this will fly very well. I still need to install the cables and horns, but they were already weighed. I also added a firewall doubler and used Du-Bro hinge points. It looks like the hinges added .2 oz, but tthey will never come apart like the factory ones would. I sure am glad I did this. No expensive batteries to buy and I can fly it all day long! Its -22 dergrees with wind chill right now so there wont be a flight report yet but trust me it will happen ASAP. Quique says it will be ballistic Adam
Posts: 655
Joined: 7/15/2006 From: Lakeland,
MN, USA Status: offline
I dont know if the tank location will be a problem yet but I have thought about. The line from tank to carb is about 12". My worry is in a hover and will wring the plane out high until I know that the fuel system is up for the challenge. Of course I will run it at all attitudes on the ground before it flies. I have sealed the engine box with Blenderm tape around the fuse area and there is a firewall inside the fuse. It is just like the 86" Yak. Adam
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RE: 49" with OS.32SX - 
