Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Sundowner 50 and YS 110 need help

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Old 06-18-2008, 11:16 PM
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HONOR50
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Default Sundowner 50 and YS 110 need help

Just purchased a YS 110 for a sundowner 50 ..... and having trouble finding a mount that will work w/out drilling new wholes. If anyone has any info can you please post a link of the mount.


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Old 06-19-2008, 05:44 AM
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Default RE: Sundowner 50 and YS 110 need help

I think you will have to drill out new mounting holes. It fits a Saito 82 but not any bigger from what I have heard.

I wanted to get the Sundowner 50 with OS 75AX 2 stroke but thought a 55AX would be better as I didn't want to go to the trouble of drilling new mounting holes.
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Old 06-19-2008, 09:52 AM
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Default RE: Sundowner 50 and YS 110 need help

ok thx for the info.... anyone using a sundowner that had to drill new holes... if so can you please post what mount you got.
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Old 06-19-2008, 10:13 AM
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Default RE: Sundowner 50 and YS 110 need help

Ok well I am getting a little discouraged… I was reading on another post that to use a YS 110 that I am going to have to push the fire wall back… Is that true? If it in sadly I am going to have to get a different engine because unfortunately I am not experienced enough to change the firewall on the plane
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Old 06-19-2008, 02:03 PM
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Default RE: Sundowner 50 and YS 110 need help

did you measure the distance needed yet from the front of engine to the firwall to make sure that it is the right distance. most people i see are using a os 91 including myself and i had to redrill the holes. it wasn't bad just take your time and measure carfully.
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Old 06-19-2008, 03:19 PM
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Default RE: Sundowner 50 and YS 110 need help

ok thanks for the reply. I went down to my lhs and got a new mount... The du-bro .45-.80 mount(vibration reducing) for 4 strokes. The 120 and 115 size mount was going to be do big and not fit. ... Before I open it is this mount going to be able to handle the ys 110

Sorry im a long time flyer but new to building.
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Old 06-19-2008, 03:34 PM
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Default RE: Sundowner 50 and YS 110 need help

I wouldn't use a vibration mount that small for a YS 110, you'll probably end up tearing the isolators out of it and have a VERY soft mounted engine! I think you're going to have prop clearance issues with that engine as well, that's a HUGE engine for a 50 size plane, you'd be further ahead with a hot 2 stroke 60 like a Jett or something.
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Old 06-19-2008, 04:05 PM
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Default RE: Sundowner 50 and YS 110 need help

Well these are the ones i got... the next size up that would accomadate the engine are on the bigger side and dont fit.
http://h1071685.hobbyshopnow.com/pro...sp?prod=DUB682
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Old 06-19-2008, 04:06 PM
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Default RE: Sundowner 50 and YS 110 need help

No one on the forum has ever used a Ys 110 on this plane?
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Old 06-19-2008, 04:07 PM
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Default RE: Sundowner 50 and YS 110 need help

also with the mount i have there is no clearance issue with the prop
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Old 06-19-2008, 04:30 PM
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Default RE: Sundowner 50 and YS 110 need help

I hate to say it, but those particular dubro mounts are awful, from my experience they create more vibration than they dampen it, you really need to run a nose ring with that style if you want it to work somewhat decent.
As for prop clearance, I meant with the ground, the YS 110 I think (can't remember for sure) will take a 15 or 16" prop, even a 14" might be on the long side, not to sure though. I would go over every glue joint in the airplane and make sure they are all strong, particularly the firewall and gear areas. The YS's are awesome, but they do pound, I'd use a regular solid mount over those dubro mounts personally.
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Old 06-19-2008, 04:43 PM
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Default RE: Sundowner 50 and YS 110 need help

Could you please post a website of a good mount that will work witht he ys 110S
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Old 06-19-2008, 04:45 PM
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Default RE: Sundowner 50 and YS 110 need help

And really i cant take this anymore im ready to just take the engine back.
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Old 06-19-2008, 05:13 PM
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Default RE: Sundowner 50 and YS 110 need help

In many post people recommended this engine for this plane ... alls I am asking is for someone to post a mount that’s going to work
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Old 06-19-2008, 05:15 PM
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Default RE: Sundowner 50 and YS 110 need help

Do you want a soft mount in particular? If you don't care if it's a soft mount then just use a mount like these:
http://www3.towerhobbies.com/cgi-bin...&I=LXJ773&P=ML
http://www3.towerhobbies.com/cgi-bin...?&I=LXB881&P=7

Don't forget, if for some reason you need to, you can cut the beam portions of those mounts shorter, they only need to be long enough to hold the engine.

If you want a soft mount that doesn't cost a fortune and works well, if it will fit, use one of these: (DAV1035)
http://www.centralhobbies.com/Engine...davebrown.html


I've never used this mount but have always known Gator RC to sell a good product
http://www.centralhobbies.com/Engine...ts/gatorrc.htm

The ultimate soft mount is a Hyde mount, but they are expensive, the least expensive one that would work for you is this one
HCMCMIII

Type C

http://www.centralhobbies.com/Engine...mnts.html#mk3c

You don't need to use a nose ring with that hyde mount.

Whether those will fit without firewall modification I don't know, but you have picked a HUGE engine for that airplane so I would probably expect that the firewall location won't be optimum for that engine.

Why did you choose the YS110 out of curiousity? On that airframe a higher reving 2 stroke would probably benefit you more than the 4 stroke.
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Old 06-19-2008, 05:25 PM
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Default RE: Sundowner 50 and YS 110 need help

ok thx for the reply my lhs has the first one you posted... if the du-bro like the one i have but the bigger version fits you still would go with this? http://www3.towerhobbies.com/cgi-bin...&I=LXJ773&P=ML
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Old 06-19-2008, 06:13 PM
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Default RE: Sundowner 50 and YS 110 need help

I run the YS 1.10 in several of my 40 size warbirds and I use the Dave Brown FS/DF
http://www3.towerhobbies.com/cgi-bin...?&I=LXB880&P=M

Never had a problem. For maximum clearance I remove the section between the top two holes to allow the air box to set right in front of the firewall. I just measured my Kelly and it is 4 11/16" from the firewall to the front of the cowl. The YS 1.10 measures 4 3/4" from the farthest back point, which is the adjustment screw on the carburetor, to the front of the thrust washer. It should fit nicely if you modify the Dave Brown mount like I suggested.

Blessings, Terry
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Old 06-19-2008, 08:01 PM
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Default RE: Sundowner 50 and YS 110 need help


ORIGINAL: HONOR50

ok thx for the reply my lhs has the first one you posted... if the du-bro like the one i have but the bigger version fits you still would go with this? http://www3.towerhobbies.com/cgi-bin...&I=LXJ773&P=ML

Yes, either that one of the Dave Brown one http://www3.towerhobbies.com/cgi-bin...?&I=LXB881&P=7
The Dave brown one will take up less space than the Great Planes one. It is just my personal opinion, but based on experience, those dubro soft mounts are garbage. They shake like crazy and the rubber isolators wear out quite fast. The biggest problem with them is they'll let the nose of your engine bounce around really badly without a nose ring so you'll beat the hell out of your cowl with it.
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Old 06-19-2008, 11:51 PM
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Default RE: Sundowner 50 and YS 110 need help

ok well the db 120 or the db90?
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Old 06-20-2008, 09:22 AM
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Default RE: Sundowner 50 and YS 110 need help

With switching to any other engine mount, you are going to have to drill new firewall mounting holes. That is not difficult.

The issues I see with the YS110 is the linear distance from the firewall to the cowl spinner ring. The YS110 is a long engine, and you will find that it is going to extend forward a bit of the required distance.

That is why others noted that you have to cut the firewall or firewall box loose and move it aft a bit.

Also keep a keen watch on the aircraft CG as you build it. The 110 out front is going to cause the plane to come out noseheavy.

It balances within reason and with little effort with a YS63, Saito 82, OS55 or Jett 50/60L.

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Old 06-20-2008, 03:33 PM
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Default RE: Sundowner 50 and YS 110 need help

I understand that its on the longer side ... but I tested it with the cowl on and it fits fine... is there something else that I am not understanding?... i drilled the mounting holes already for the DB. is there an issue with it if the pop is out a bit? also i see people at the fields with YS 110 on there warbirds that are 40 size.
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Old 06-20-2008, 05:20 PM
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Default RE: Sundowner 50 and YS 110 need help


ORIGINAL: HONOR50

ok well the db 120 or the db90?
120 size, remember, your YS110 is more powerful than the average 120 4 stroke. If in doubt, always go bigger/stronger. Besides, the 90 size mount might not be wide enough for the 110, not sure on that though.

The only issue with your prop/spinner/thrust washer further foward from the cowling is the unsightly gap between the cowl and spinner backplate AND the fact that your weight is that much further foward which makes it tougher to balance. AS long as it fits in the cowl and you're happy with the gap between spinner and cowl go for it.

You can stick any engine in any airplane (within reason) but you have to be prepared to make modifications when not using the designed parts. I had a Great Planes Little Toni with a YS120 in it, I had to cut the firewall off and move it backwards as well, not a big deal, but something you have to be willing to do if you're going to use a bigger engine.
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Old 06-20-2008, 07:26 PM
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Default RE: Sundowner 50 and YS 110 need help

Ok thx for the info... when I tested it the gap is not that big... so if I understand correctly if the gap does not bother me I don’t have to cut the firewall correct?
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Old 06-20-2008, 08:18 PM
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Default RE: Sundowner 50 and YS 110 need help

Like I say, it will not help you any with balancing, but no, that gap is not critical. Of course the smaller the gap the less drag it can cause, but we're probably talking fractions of a mph. Keep in mind that on the YS the fuel lines fit over the nipples on the front of the engine, so make sure there will be room for the fuel lines and everything.
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Old 06-20-2008, 08:20 PM
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Default RE: Sundowner 50 and YS 110 need help

LGM Graphix, Thanks for all the help ... I will post back later on the re****s off my first flight!!!
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