RE: What do you have your conversion in???

RE: What do you have your conversion in???
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RE: What do you have your conversion in??? - 1/3/2007 2:48:12 AM

av8tor1977

Posts: 2598
Joined: 5/3/2003
From: ASH FORK, AZ, USA
Status: offline

I agree with everything you said, except for two things...

One, we found in our experiments with ultralight aircraft that the shielding was more effective when it was grounded on only one end; not both. This has also been my experience with model airplane ignition engines.

Also, I don't particularly recommend PCM for gas ignition engines as they can mask interference problems until it's too late. If you want to fly PCM, thoroughly test the system for glitches first with PPM.

AV8TOR

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Post #: 76

RE: What do you have your conversion in??? - 1/3/2007 2:53:20 AM

icando3d2

Posts: 63
Joined: 4/21/2005
From: goshen, VA, USA
Status: offline

ok sounds good i just got the prop adapter made up tonight got it drilled and threads in it drilled the center prop bolt for a spinner i put it all on the scales and i am a bit concerned about plane and engine weight i dont know what i should shoot for with the cap 232 and 73" span im at 13.2 give me some opinions guys

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Post #: 77

RE: What do you have your conversion in??? - 1/3/2007 4:46:35 AM

hardtop351

Posts: 258
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline

quote:

ORIGINAL: av8tor1977

I agree with everything you said, except for two things...

One, we found in our experiments with ultralight aircraft that the shielding was more effective when it was grounded on only one end; not both. This has also been my experience with model airplane ignition engines.

Also, I don't particularly recommend PCM for gas ignition engines as they can mask interference problems until it's too late. If you want to fly PCM, thoroughly test the system for glitches first with PPM.

AV8TOR

i did try fm first and had all sorts of problems....i thought switching to pcm would cure the problem which it didnt. and so i then thought that if super tigre can get a 45cc engine to work on a glow plug then so could i.........and the rest is history as they say lol.

and yes wiz....you CAN lose the ignition system too lol.

cheers
craig

ps....i hope you got everything tied down tight wiz.....bit windy over there i hear

(in reply to av8tor1977)

Post #: 78

RE: What do you have your conversion in??? - 1/3/2007 3:03:59 PM

wiz310

Posts: 217
Joined: 4/6/2006
From: LeonoraWestern Australia, AUSTRALIA
Status: offline

Never tied anything down mate. Its all to wet to blow away.

Finished the Christen today while I was stuck inside. its a sweeeeeeeeeeeet bit of gear.

knock up a muffler and fly it. I bet you can't guess what I'm going to do tomorrow.

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Post #: 79

RE: What do you have your conversion in??? - 1/3/2007 4:35:28 PM

Bill Rademacher

Posts: 257
Joined: 12/31/2001
From: Rineyville, KY, USA
Status: offline

I am flying a Ryobi 31, Bowman rings (2), CH ignition in a SIG FourStar 120 kit bashed into a ME-109.

The motor runs stronger every time I fly it. Sweet.

billrad

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< Message edited by Bill Rademacher -- 1/3/2007 4:38:57 PM >

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Post #: 80

RE: What do you have your conversion in??? - 1/3/2007 5:46:36 PM

hardtop351

Posts: 258
Joined: 12/28/2005
From: rockhampton, AUSTRALIA
Status: offline

quote:

ORIGINAL: wiz310

Never tied anything down mate. Its all to wet to blow away.
Finished the Christen today while I was stuck inside. its a sweeeeeeeeeeeet bit of gear. knock up a muffler and fly it. I bet you can't guess what I'm going to do tomorrow.

ahh...prolly the same as me...goin flying lol.....im gunna be teachin the fiance to fly tomorrow as well lol.....should be great fun considering all i have flying other than the grounded 84" extra 300 is a 40 size modeltech magic extra.

lucky we using a buddy lead

cheers
craig

(in reply to wiz310)

Post #: 81

RE: What do you have your conversion in??? - 1/4/2007 12:06:03 AM

captinjohn

Posts: 5545
Joined: 1/25/2002
From: Hesperia, MI, USA
Status: offline

Hey man...that bash job on that sig 120 into a ME-109 sure came out nice. I love flying off the pavement like in the photo. How do you like the Ryobi? Did you change much on the engine? Best Regards Capt,n

SOME FUN!!!

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I never met a engine I did not like!

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Post #: 82

RE: What do you have your conversion in??? - 1/4/2007 1:20:09 AM

foamcut

Posts: 170
Joined: 12/30/2001
From: Austin, TX, USA
Status: offline

I need a little advice from some of the more experienced members here. I would like to know a few rules of thumb regarding the right size planes to put these conversions in. I like flying over-powered and I am convinced that the gas / glow conversions are the way to go due to the weight reduction and elimination of the large rotating mass associated with the flywheel.

My first conversion will be a Ryobi 31cc. Is this too big for 120 sizes sport planes (Yak, Extra, Giles) ?
My next conversion will be a Poulan 38cc. I'm thinking maybe a 80" UltraStick might be a good choice.

Are there any guidelines you use (ie wing area, wing loading, etc...)?
Most manufacturers recommend engine ranges in both 2 and 4 cycle displacements. Do you apply some conversion factor to determine applicability of these gas / glow conversions?

Thanks for your comments and suggestions

< Message edited by foamcut -- 1/4/2007 2:12:29 AM >

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Post #: 83

RE: What do you have your conversion in??? - 1/4/2007 2:39:18 AM

Bill Rademacher

Posts: 257
Joined: 12/31/2001
From: Rineyville, KY, USA
Status: offline

Hey Captinjohn,

All I changed on the Ryobi was the use of a CH ignition, and dual Frank Bowman rings. Here are some more photos. I also moved the firewall back on the fuselage.

The cowl and spinner, decals and canopy are from SkysharkRC.

bill

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_____________________________

I may not be able to turn a kit into a plane, but I can turn a plane into a kit...

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Post #: 84

RE: What do you have your conversion in??? - 1/4/2007 7:44:34 AM

onlyifamppowered

Posts: 3
Joined: 1/2/2007
From: brisbane, AUSTRALIA
Status: offline

HI
I just worked out (i think) how to add a video of my ryobi powered beastie so here goes

thanks
http://www.rcuvideos.com/view_video.php?viewkey=567f1f393b20c855bb40

(in reply to wiz310)

Post #: 85

RE: What do you have your conversion in??? - 1/4/2007 9:57:55 PM

aero nut

Posts: 447
Joined: 11/10/2003
From: tijuanaBaja California, MEXICO
Status: offline

Nice job Mr Usher

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Post #: 86

RE: What do you have your conversion in??? - 1/5/2007 11:40:28 AM

KatanaMadMan

Posts: 121
Joined: 5/17/2004
From: Brisbane, AUSTRALIA
Status: offline

Greetings guys.
This is my latest conversion engine. 45cc chainsaw, Chinese No Name Brand. Paid $130AU + postage. Not bad really.
Was a bit of a gamble as I had no idea if it was going to be any good. It was a bit sad chopping up a brand new chainsaw
that had never been started. Plane is an ESM Katana 2m and weights around 14-15lbs.

These are some early shots of the the engine install before muffler and carby manifold was made and fitted.

Cheers KMM

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Post #: 87

RE: What do you have your conversion in??? - 1/5/2007 12:46:34 PM

KatanaMadMan

Posts: 121
Joined: 5/17/2004
From: Brisbane, AUSTRALIA
Status: offline

Ok, here she is, install completed and ready to run. I'm pretty happy with it. Made up my own carby adaptor out of
aluminium as the carby mounts are lost when cutting the cases up. Decided to put a canister muffler, with header
pipe on it as the fuse is made for this setup. Bought a KS canister and a header pipe kit as they were easily obtained.
Header pipe kit comes with 3 90 deg bends and a couple of straight pieces so you can braze or weld it to almost any shape.

After running it a few times, had to beef up the engine box as it nearly tore it off the firewall. I didn't know whether to
take that as a good sign or bad one

. Was it the super engine pull or was it a S%#ty ARF. After beefing up the engine
box I gave it a few more runs and the pull felt very strong. I have a 20 x 10 Bambula wooden prop on it turning @ around
7000. Not too shabby. So I stuck it on my fish scale and she pulled 21lbs

. Should fly it very nicely but until I fly it for
real I won't get too excited.

Cheers KMM

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