RE: Gorilla glue lay up
Gorilla glue (like any polyurethane glue) expands as it cures. This forces the glue into the porous materials in the layup. This helps to prevent voids. I use polyurethane glues in all of my foam layups.
Posted on: 5/18/2009 12:20 AM by Author "foamcut" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=8777891

RE: TAIL/ELEVATOR REMOVAL
Try heating the epoxy with your heat gun and it will eventually soften.
Posted on: 12/16/2008 6:52 PM by Author "foamcut" in the forum "Composites Fabrication And Repair"
http://www.rcuniverse.com/forum/fb.asp?m=8252804

RE: Lets do a 40cc ryobi conversion!
bilzair, Did you do the fabrication / welding on that muffler? I looks awesome.
Posted on: 11/6/2008 8:20 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8122020

RE: Almost Perfection - Scratch Build
The perfection is an excellent airplane. I had one for about a year and kick myself for selling it. This design really convinced me of the value of tip sails / plates on the wingtips.. The longer fuse made it much more gracefule in the air than a standard stick. I'm going the other way on my scratch build and am scaling up to a 25cc gas / glow engine. The wing will be built up from laminated foam ribs with a standard D-tube construction. I'll cut the fuse out of foam (to establish dimensional criteria) and laminate balsa to the outside (for structural rigidity). The I'll cut out the needed areas for components in the fuse.
Posted on: 10/22/2008 6:59 PM by Author "foamcut" in the forum "Scratch Building, Aircraft Design, 3D/CAD"
http://www.rcuniverse.com/forum/fb.asp?m=8075018

RE: GAS/GLOW HOW TO....
Av8tor, Thanks you for consolidating this into a an easy to follow instruction set. Your efforts to develop this system (along with others) and your continued efforts to educate are greatly appreciated. I've saved this post as a set of instructions for my own conversion efforts. Thanks again
Posted on: 10/1/2008 7:55 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8010052

RE: Lets do a 40cc ryobi conversion!
Billzare, That's a nice prop hub. Did you make it? If so how did you bore the taper for the crankshaft end? Thanks
Posted on: 9/13/2008 8:40 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7951344

RE: Ryobi 4-troke to glow
Thanks for yourhelp.
Posted on: 9/10/2008 7:59 AM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7939394

RE: Ryobi 4-troke to glow
TLAR, Where did you find the 1/4 NPT fuel line fitting used as a glow adapter? Thanks
Posted on: 9/9/2008 8:54 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7938126

RE: Lets do a 40cc ryobi conversion!
I bought a refured version from Amazon.com for $109. The compression is wicked. If anyone has a lead on prop adapters let me know. I'm going to set mine up as gas / glow. Thanks
Posted on: 8/14/2008 9:33 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7847074

RE: prop. size
RWB, Let us know your progress. What size carb did you use? Thanks
Posted on: 8/9/2008 9:53 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7828206

RE: the godfather
Mike, Tom goes by the user name Tom Perry here on RCU. He used to build large gassers from Husky chainsaws. He sold a few on Ebay as well. He's sometimes know as "The Engine Doctor". I've purchased several engines from him and gained a lot of good advice.
Posted on: 7/14/2008 9:21 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7731449

RE: the godfather
Ralph Cunningham or Tom Perry
Posted on: 7/12/2008 8:01 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7723671

RE: need crank welding services for my BME twin
Billzair, If you have the abiliy to fab a twin crank from two singles I'd be interested as well. I've got all the components I need to make a twin 50cc engine out of a pair of 25cc engines. I just don't have the equipment or knowledge to make the crank.
Posted on: 6/8/2008 8:27 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7595954

RE: A word about Keith Baker and BME Engines
OK I have to add my input to this thread. I met Keith and his wife many years ago at a fly-in here in Austin TX. At the time I was new to RC and didn't know much about RC engines. After speaking with for awhile and looking at his work I was so convinced I bought two engines on the spot and ordered two of his BME26 engines which he quickly shipped. Over the years I spoke with him several times and purchased several more engines and a Falkon ignition when was carrying their product. I corresponded with him multiple times on these boards and always learned a great deal. I've never had any trouble with any of his products or advice. I still don't see how it was humanly possible for him to keep up with the demands of a finicky public. Keith is a mechanical genius and a total class act. There is much that manufacturers could learn from him.
Posted on: 4/2/2008 9:25 PM by Author "foamcut" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7324270

RE: has anyone ever tried to convert the Ryobi 990r 4 stroke?
Thanks!
Posted on: 3/22/2008 6:44 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7266286

RE: has anyone ever tried to convert the Ryobi 990r 4 stroke?
Planepounder, Where did you find a glow adapter for this engine? Thanks
Posted on: 3/22/2008 10:44 AM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7264501

RE: The sound of twin Ryobi's
Adrian, That twin looks really great. You've come up with a new approach to the tried and true Ryobi conversion. Good job!
Posted on: 3/5/2008 7:22 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7181166

RE: gas fuel with glo plug no ignition
Wingspan99, Wow...that's a great vid! Let us know how the gas / glow or E85 / glow mix experiments work out. Thanks
Posted on: 1/21/2008 10:53 AM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6943834

RE: gas fuel with glo plug no ignition
Did anybody evaluate E85 rather than gas in the gas / glow mix? Thanks
Posted on: 1/2/2008 8:18 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6844222

RE: ryobi 4 stroke weight
Dave, Were you ever able to run the Ryobi 4 stroke on glow or gas / glow? Thanks
Posted on: 12/25/2007 1:39 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6802801

RE: Echo BME twin
Tim, Have you tried fitting one of the Mac25 cylinders to the BME case? I tried fitting a cylinder to a case and found that the mounting lugs line up after rotating the cylinder a few degrees. This would mean that the exhaust would not be exactly perpendicular to the crankshaft centerline. A custom exhaust header would probably need to be created. As long as the relationship between the ports, case, and piston skirt remain the same it might work. Unfortunately I don't have the equipment or skills to cut / weld a crankshaft or I'd try it myself.
Posted on: 12/9/2007 4:32 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6735195

RE: Two homie 25 and a prop driver.
KI8FR, I think what you've pictured is a belt driven reduction unit. Byron used to make a similar unit to obtain realistic prop size / speed for warbird applications (P51 notably).
Posted on: 12/1/2007 9:46 AM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6698961

RE: 4 stroke conversion oiling
A related series of questions might be useful here: 1) Can 4 stroke glow engines (OS, Enya, magnum, YS, etc...) be run inverted? 2) If the answer to #1 is yes due to the oil content of the fuel, can the same principle be applied to 4 stroke conversions? 3) If the answer to #2 above is yes, does it make a difference if the ignition/fuel mix is magneto (gas), gas / glow, or just glow (alcohol / oil)? I'm really interested in the feedback on this one. Thanks
Posted on: 11/25/2007 9:36 AM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6670062

RE: mcculloch 28 vs homie 25
Rollmyown, Once again thank you for sharing your expertise.
Posted on: 11/2/2007 7:14 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6572907

RE: mcculloch 28 vs homie 25
TKG, Great idea for the muffler mount...thanks for sharing.
Posted on: 10/25/2007 12:18 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6537135

RE: mcculloch 28 vs homie 25
Rollmyown, Your mods to the Mac engine are really well done. I'm going to copy a few of your suggestions. Thanks for sharing your work.
Posted on: 10/24/2007 9:48 AM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6527487

RE: mcculloch 28 vs homie 25
rollmyown, I was guessing that you had TIG welded the exhaust flange onto the cylinder. Apparently you've found a way to make those aluminum gas welding rods work. I had thought that the exhaust temperature would eventually soften any material deposited. Since you're using MAPP gas you're using a much higher temperature during the weld. Are you using any other methods like a special flux or pre-heating the cylinder? Your method is a real problem solver for the exhaust on this engine, the exhaust on a weedie 18cc, and the intake on a Poulan 46. Thanks again
Posted on: 10/23/2007 5:23 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6529172

RE: I converted a glow engine to run on E85
Tom, That's great news since it opens the possibility of using Zama carbs in this mix. The Fireball glow plugs went in the mail today. You should get them Tuesday. I sent 2 RC idle bar and 2 of the 4 stroke "hot" plugs. Thanks for your collaboration...
Posted on: 10/20/2007 10:35 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6517302

RE: mcculloch 28 vs homie 25
I just googled him and came up with an ebay store.
Posted on: 10/20/2007 1:23 AM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6514164

RE: I converted a glow engine to run on E85
Tom, Great idea...from what I've heard the most likely effect (if any) will be the swelling of the diaphram. The glow plugs will be in the mail tomorrow. Thanks for your continued efforts in this evaluation.
Posted on: 10/19/2007 4:50 PM by Author "foamcut" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=6512417