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Model Forum / Radio Controlled / Air Models / May 20101946 U control Stinson Reliant Plan ?
I have a full size Mechanix Illustrated plan from 1946. How hard would it be to convert to electric in building this model? Thanks, Ted. > I have a full size Mechanix Illustrated plan from 1946. How hard would > it be to convert to electric in building this model? Thanks, Ted. Are you keeping it CL, or going to RC? Without seeing how it's designed it's hard to say, but I suspect you'll do more work modifying the design for ailerons and rudder (if you're converting to RC) than you will putting an electric motor in there. There's a ton of guidance out there for sizing the electric motor -- get back to us if you can't figure out what to use (hint: tell us what the original motor was, and the size of the plane). Most of the older planes used beam motor mounts, and most of the current electric motors are firewall mounted, so you'll have to redesign the nose. How difficult this is will depend on how central those motor bearers are the fuselage design. If you're keeping it CL check the forum on Stunthanger.com -- there's some nifty timers for running electrics out there these days. I don't know if anyone's done a throttle yet for an electric from a 3-wire system, but I sure hope it's out there!  SignatureTim Wescott Control system and signal processing consulting www.wescottdesign.com Thanks for your replys. The ws is 31 inches and the engine is a Ohlsson 23, but the author of the M I plan said aything from 19. to .49 ci would work. I would probably keep it as a CL. Thanks, Ted. > Thanks for your replys. The ws is 31 inches and the engine is a Ohlsson > 23, but the author of the M I plan said aything from 19. to .49 ci would > work. I would probably keep it as a CL. Check the Stunthanger group -- I want to see the answers! A .19 to .49 engine from 1946 may make sense in a 31 inch wingspan Stinson, but today you wouldn't want to put in more than a .21, and a hot .09 would probably work if you built light. An e-flight 15 would probably work, but I don't know where to go for the timer. SignatureTim Wescott Control system and signal processing consulting www.wescottdesign.com I registered with the Stunthanger group, but have not yet received the acceptance email from them. I'll post anything I learn from them. Thanks, Ted. > I registered with the Stunthanger group, but have not yet received the > acceptance email from them. I'll post anything I learn from them. > Thanks, Ted. BTW: If I wasn't buried in projects, I'd be begging you for a copy of those plans. It sounds like a fun plane, and I've got a Cox 15 Medallion in my "to be restored" bin. SignatureTim Wescott Control system and signal processing consulting www.wescottdesign.com I registered and got on the Stunthanger web site, but couldn't make out heads or tails on how to get info on converting the Stinson to electric. Ted. > I registered and got on the Stunthanger web site, but couldn't make out > heads or tails on how to get info on converting the Stinson to electric. > > Ted. Click on the 'forum' link (http://www.stunthanger.com/smf/), log on, find either the electric forum of the scale forum, and post a message to ask. SignatureTim Wescott Control system and signal processing consulting www.wescottdesign.com I got a reply today to my 1st post on the Stunthanger "AMP'ed" forum Tim. The reply concerned mainly info on which elec. motor system to use. I hope to get future info on changes to the fuse on installing elec. You suggested that I post replys here. I see that you are a member of Stunthanger. Would you want read them there (Stunthanger), or have me post them here. BTW, the man who answered my post lives in Marshall,Mi. which is about 30 miles from where I live in Spring Arbor, Mi. If you would want to make a copy of my Stinson plan , I could mail it to you. The plan is one sheet 31"X42". Ted. > I got a reply today to my 1st post on the Stunthanger "AMP'ed" forum > Tim. The reply concerned mainly info on which elec. motor system to use. [quoted text clipped - 6 lines] > If you would want to make a copy of my Stinson plan , I could mail it to > you. The plan is one sheet 31"X42". Did I? I'll see your thread on Stunthanger -- I check it pretty often. How to modify things to accept the electric always depends heavily on how the fuselage is built, so it varies widely. Basically, though, you need a firewall that's much farther forward than the original or you need to build a box to mount the motor onto that puts the propeller where it needs to be. Then you need a home for the batteries, preferably one that gives you a convenient and good looking hatch for removal, because you really want to charge LiPo batteries outside of the airplane. The Reliant has a radial engine, which means a short nose moment, which complicates things even further as you (probably) want the battery as far forward as possible. You may even want to make the cowl to be easily removable and to be the hatch, and you may even need to have the batteries extend forward into the cowl area -- this all depends on how the plane is built, of course. SignatureTim Wescott Control system and signal processing consulting www.wescottdesign.com >I have a full size Mechanix Illustrated plan from 1946. How hard would >it be to convert to electric in building this model? A fellow in our club has had surprising success (surprising to me anyway) in doing conversions like this. I imagine you might need to be careful about the CG. With some scale models, it helps to enlarge the vertical fin to get a better-flying model. I don't think that would be as important an issue for the CL models as it is for RC. Marty SignatureBig-8 newsgroups: humanities.*, misc.*, news.*, rec.*, sci.*, soc.*, talk.* See <http://www.big-8.org> for info on how to add or remove newsgroups. |
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