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triple blade prop question - 9/14/2012 11:24 AM   
tardster


 

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Status: offline 		I'm building a 78" w.s. B17 the plans call for 15-25 2 stroke or 30 4 stroke engines for it. I plan on using 4 Saito .40's since thats the smallest I can find and was wanting to know what size/pitch triple blade prop would be good for these engines.

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RE: triple blade prop question - 9/14/2012 2:35 PM   
jester_s1


 

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Status: offline 		The owner's manual should have the right recommendation. If if doesn't list a 3 blade prop, just go down 1 inch and keep the same pitch to get roughly the same loading.

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RE: triple blade prop question - 9/14/2012 2:56 PM   
jaka


 

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From: Upplands Vasby, SWEDEN
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A 78" four engine plane will be much over powered with .40 four-strokes. Belive me.
My 211cm span Marutaka DC-3 is powered with two OS FS.26 engines swinging three blade 10x4,5 carbon fiber props and the performance is very good.
If I were you a would use four OS .15 LA engines swinging 8x5 APC propellers.

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< Message edited by jaka -- 9/14/2012 9:25 PM >

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RE: triple blade prop question - 9/14/2012 4:02 PM   
Gray Beard


 

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Status: offline 		Pretty good advise from Jan.

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RE: triple blade prop question - 9/15/2012 1:00 AM   
tardster


 

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Status: offline 		I really want to go with 4 stroke engines, for some reason I've never had any luck with the os engines. I've looked and found that Saito has a 30 or 35 (cant remember right off the top of my head) but I haven't found any dealers that have them. I don't plan on racing it or anything like that but it sure will sound alot nicer with the 4 stroke on it lol.

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RE: triple blade prop question - 9/15/2012 1:42 AM   
Gray Beard


 

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Status: offline 		I was just in Hobby Town in Las Vegas the other day and in the bottom corner of the display case was a old? Dusty little four stroke? I don't recall the size but it was sure small. Looked like an OS. It also looked like it had been there for a few years.
I agree, the sound would be cool but the 40s are a bit too big. The reason Jaka mentioned the LAs is they are cheap and run very well without dead sticks. The LAs aren't fire breathers but you can depend on them once set up correctly. I pull the head screws and use a bit of locktite on them before I ever start them. Just something I learned about the LAs when I was using them. The Saito 30s may work out fine for you? If you can locate them, I have never seen them stocked at our local Saito dealers.

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RE: triple blade prop question - 9/15/2012 2:24 AM   
ARUP


 

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Status: online 		Good advice on the LA's, Gray Beard! How about four HP VT.21's from MECOA?

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RE: triple blade prop question - 9/15/2012 3:56 PM   
red head


 

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Status: offline 		It's been awhile since I've had an HP engine but as I remember it , they are on the heavy side . Os used to make a 20 size 4 stroke thaat might work if you could find 4 of them. I've had 2 of them and they were great, still have one .
Sounds like the 20 or 25, 2 strokes are your best bet . ENJOY !!! RED

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RE: triple blade prop question - 9/15/2012 4:18 PM   
carrellh



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Status: offline 		It appears the Saito 30 is discontinued; or Horizon stopped importing it.
Hobby People no longer carries the Magnum 30
The OS 30 is still available
The ASP 30 http://www.justengines.unseen.org/acatalog/AAero_4_Stroke.html is still available


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RE: triple blade prop question - 9/15/2012 5:06 PM   
Gray Beard


 

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quote:

ORIGINAL: ARUP

Good advice on the LA's, Gray Beard! How about four HP VT.21's from MECOA?

I like the looks but have never seen or used one. Other then one old .46 two stroke I still have I don't know a lot about the Mecoa. The .46 is no different then any other engine, it ran well. I still have it but don't have a muffler for it.

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RE: triple blade prop question - 9/15/2012 7:51 PM   
jaka


 

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All OS engines are dead reliable so you cannot go wrong with the OS .15 LA engines.
But I agree that four strokes sound better. OS .30 FS are an alternative, though a little on the heavy side compared to the .15 LA engines.
HP is no alternative as they are not as reliable as the OS engines and they are also heavier and does not sound good compared to ordinary poppet valve four strokes.


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RE: triple blade prop question - 9/17/2012 1:04 PM   
tardster


 

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Status: offline 		Sorry about the wait guy, had to go to Chicago for drill. I can't say I've had any good luck with OS, I have a couple of the OS LA40's and to be honest they suck. I've had better luck with Tunder Tiger than OS. I've been looking at the ASP and Magnum engines but it's hard to see spending the same amount (or with-in 10 bucks) for one of those rather than the Saito. The HP VT.21's from MECOA don't look to bad, does anyone know where to get those from? Thanks for all the feedback guys...

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RE: triple blade prop question - 9/17/2012 6:31 PM   
red head


 

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Status: offline 		I think HP has a rep. somewhere out West , I'm sorry I dont have more on them, they may be the same folks that have the old K & B stuff now.

You might want to try a couple of the other forums , there is one on multi eng. a/c and a couple more dealing with engines etc., they may have more info.. Also check the weight on the HP's. Good Luck . ENJOY !!! RED

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RE: triple blade prop question - 9/20/2012 8:06 AM   
tardster


 

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Status: offline 		Thanks guys, I haven't found anyone or any place that has the Saito 30's so it looks like I'll have to go with the OS Surpass 30's for it.

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RE: triple blade prop question - 9/20/2012 1:22 PM   
Top_Gunn


 

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quote:

ORIGINAL: ARUP

Good advice on the LA's, Gray Beard! How about four HP VT.21's from MECOA?

I have an HP .21. It's a great engine, but it produces very little power. Mine is in a Kadet Seniorita, and it barely flies it. If the grass hasn't been mowed for a couple of days I have to hand launch it. Can't beat it for coolness, though!

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RE: triple blade prop question - 9/20/2012 5:43 PM   
jaka


 

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Status: offline 		Hi!
As I told you before the Hp .21 is not an option for a multi engine plane! It's too heavy and develops too little power, and worse ...it doesn't sound as good as the poppet valve OS .FS.20, 26 or .30.

OS LA .15 are ideal for a four engine B-17 (Marutaka).

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RE: triple blade prop question - 9/20/2012 6:29 PM   
Gray Beard


 

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Status: offline 		I'm pretty sure it is an HP I saw in the Hobby Town in Vegas. I will be doing a road trip over there real soon. There are three hobby shops all close to each other so I hit all three. I can look and see what it is and let you know. It's been in the case a long time according to the dust. I'm not going to say it isn't any good but I have been flying a long time and haven't ever seen anyone with one.
I fully agree about the LA 40, total junk but I have had zero problems with the .46 and used them for years in fun fly events. The .15s are used a lot in gliders and work great. I do open up the box on any new LA, remove the head screws and clean them in acetone then add a bit of locktite to them and replace them. If I didn't then every one of them {8} has loosened up during the run in. Other then that, no problems, no dead sticks after break in and final tune.
I would be looking at the small OS four strokes though. I have had great luck with them too, not so much with Saito. Most my friends like and use Saito but that is due to our main hobby shop being a dealer and having them in stock over the years. He sold OS too but didn't stock the four strokes so you had to wait three or four days to get one.
For those that don't know it, RCU has an engine forum, both gas and glow. You can get a lot more information about engines there, even factory support. When I have an OS question I always ask Bax. I rebuild a lot of OS four strokes but if I'm stumped about something Bax is my Go To. He sees them every day and a lot of them. Way more then I ever will.

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RE: triple blade prop question - 9/21/2012 2:24 AM   
tazzzz


 

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RE: triple blade prop question - 9/21/2012 5:26 AM   
Bozarth


 

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quote:

ORIGINAL: tardster
...I can't say I've had any good luck with OS, I have a couple of the OS LA40's and to be honest they suck. ...


Just remember that the LA series is at the bottom of the OS line. Don't write off the better OS engines.

Kurt


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RE: triple blade prop question - 9/21/2012 5:50 PM   
Gray Beard


 

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Status: offline 		They are just bushing engines with an air bleed carb but once set up they run great. The 40 was junk though. Very under powered but the 46 was quite good. I haven't used the smaller engines myself but there were a lot of them used at my club on gliders. They don't produce the power of the higher priced bearing engines but they are dependable. I will try to find out tomorrow what that little four stroke I spotted is and get some information but it looked like the HP in the photo that was posted.

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