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Brand New RCV 90 - 1/8/2003 6:21:48 PM   
Rckfish



Posts: 87
Joined: 4/22/2002
From: Maumelle, AR, USA
Status: offline 		Otto,
I am the proud owner of a new RCV 90. I picked this engine because I am building the Brian Taylor 70" Hurricane and the RCV will fit nicely. I am also intrigued by the new technology and can see so many warbird applications.

There are 2 questions I have. Beyond the manufacturers break in instructions, do you have any caveats? Also, I want to run a 3 blade prop and I'm curious if you can suggest a manufacturer and size?
Thanks
Paul
       Post #: 1

props - 1/9/2003 6:42:47 AM   
lokeetl


 

Posts: 23
Joined: 9/7/2002
From: Sumner, WA, USA
Status: offline 		Paul,

I'll pass on to you what Otto told me on the phone yesterday.
He is not fond of 3 or 4 bladed props on RCV motors. It's an issue of efficiency. More blades equals more drag. Check under the 3 and 4 bladed props thread for his words. He also recommends wood props. APC and the other plastic/composite props were way down his list.
Using his parameters I'm guessing he'd say that 90 would be good in the Hurricane. I'm building a 66" Hawker Sea Fury myself.
I made a mistake and bought the 120 RCV for it. It said a 120 four stroke was ok on the box, but the RCV's perform bigger for the same displacement. A 90 would have done it. Oh well! Still learning!
Enjoy yours! They are very cool!

Chip

(in reply to Rckfish)
       Post #: 2

Brand New RCV 90 - 2/3/2003 6:33:23 AM   
edwarda10pilot


 

Posts: 99
Joined: 3/8/2002
From: Universal City, TX, USA
Status: offline 		Paul:

I am doing some testing on my new RCV 90. I have an H-9 P-51 that I have been flying with a YS 91 and I am now installing the RCV 90. I should have the engine mounted by the middle of the week and hopefully flying by the weekend. Incidentally, some people may not be fond of the 3 or 4 bladed props but I am going to try some. I just ordered a Zinger 16x10 three and four bladed props to try. Please see my posts on the "How to start the RCV" thread as I am posting my results on this thread.

Chip:

Not to worry abit buying the RCV 120. In a bench test Clarence Lee performed on both engines, he found that the 120 only turned 300 more RPM than the 90 on the same prop and fuel. I haven't tested a 120, but I trust and believe Clarence.

Later,
Ed

(in reply to Rckfish)
       Post #: 3

120 'itis - 2/3/2003 11:35:16 AM   
lokeetl


 

Posts: 23
Joined: 9/7/2002
From: Sumner, WA, USA
Status: offline 		Ed,

I'm still not going to put that 120 in the Sea Fury. I don't really want to torque roll the plane into the turf on take off. I'm a scale flyer, but why add stress? With a 18x14 prop it was over reving at 5400 rpm plus. I didn't open the throttle any further than that. I don't think the idea of the 120 was to spin any faster than the 90. If one was to use a 90 size prop on it I'm sure it might go up a few hundred revs. It's that bigger prop that sets it apart. A US Engines 35 cc. with a 20x12 does not turn a whole lot faster. It's a pound and a half heavier too. For models that are ' on the fence' with the weight/thrust decision to make, the lack of some revs might be made up for by the lighter engine.
(that US engine IS quite a bit cheaper, however. Hi Otto!!) :

I bet you are going to have a hoot with your engine/plane setup.
Keep us up to date. I'm going to try a NW hobby Tech 85" foam core Mustang with the 120 to see if will fill the bill. If not, well, time to try gas!

Otto,

How did the F8F inquiry go? Any future for the 1/6 scale foam core? I'll be a buyer!


Chip

(in reply to Rckfish)
       Post #: 4

Brand New RCV 90 - 2/3/2003 5:56:53 PM   
Otto Kudrna



Posts: 373
Joined: 2/19/2002
From: Burr Ridge, IL, USA
Status: offline 		hi Chip
After about 10 attempts to get hold of them there was no luck. I will try again today, see if someone picks up the phone.

Otto

(in reply to Rckfish)
       Post #: 5

Brand New RCV 90 - 2/5/2003 9:20:41 AM   
lokeetl


 

Posts: 23
Joined: 9/7/2002
From: Sumner, WA, USA
Status: offline 		Otto,

I stopped by and asked him about your calls. Carl said he got them but his brother-in-law is named 'Chip' also, so he thought the 'Chip recommended calling you' dubious at best. He asked me to let you know to call him again. He just got rolling again yesterday after his mothers funeral. Convince him about those F8Fs!!

I ordered a 85" P-51 from him. When I get going on it I'll keep you up to date. Well, make that everyone who reads this and is interested in just how much pull an RCV 120 has. It just might do it.

Chip

(in reply to Rckfish)
       Post #: 6

Brand New RCV 90 - 5/30/2003 12:44:38 AM   
Francis L M



Posts: 104
Joined: 5/28/2003
From: n/an/a, GIBRALTAR
Status: offline 		Francis,
Hi there
I have an RCV90 and i have it on 75" Corsair
the motor is with a 3 bladed prop and gose like a dream
i am useing a 16`5 X 14 3 blade by mejilk
If u feel u need any help just Mail.
Happy flying Francis

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score55

(in reply to Rckfish)
       Post #: 7

Brand New RCV 90 - 6/4/2003 4:05:18 AM   
Rocketman612



Posts: 2065
Joined: 1/19/2002
From: Enterprise, AL, USA
Status: offline 		Francis L M,
I'm going to put an RCV90 in my TF Corsair 60 Size. What kind of RPM'S are you turning with your setup? How about speed as I'm looking for scale flight but would like alittle extra if needed. Pete


_____________________________

"Remember, all im offering is the truth, nothing more..."
Morpheus

(in reply to Rckfish)
       Post #: 8

Brand New RCV 90 - 6/4/2003 11:11:58 PM   
Francis L M



Posts: 104
Joined: 5/28/2003
From: n/an/a, GIBRALTAR
Status: offline 		Rocketman612
About your revs. 1st do a good break in to the engine, at least 4 tanks of 12oz at a constant 3000rpm.
After this tune the engine.
Your rev should be on the low about 2000rpm 16.5 x14 three blade and on the high about 5000 to 5500rpm.
My model weighs 14lbs with all the goodies and she flys very scale like.
The TF corsair is smaller and hence lighter so she should fly even better. the advantage of extra power is you can always throttle back.
happy flying

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score55

(in reply to Rckfish)
       Post #: 9

Brand New RCV 90 - 6/4/2003 11:42:37 PM   
Rocketman612



Posts: 2065
Joined: 1/19/2002
From: Enterprise, AL, USA
Status: offline 		Francis L M,
Thanks for the info. I'm planning (and praying) to be 10 lbs or less. I will start the breakin later this month. Take care, Pete


_____________________________

"Remember, all im offering is the truth, nothing more..."
Morpheus

(in reply to Rckfish)
       Post #: 10

Brand New RCV 90 - 6/5/2003 5:25:51 PM   
Damnathius



Posts: 518
Joined: 9/28/2002
From: Lancaster, CA, USA
Status: offline 		Francis,

Are you really getting a low idle of 2000? My 120 will sit and tick over between 950 and 1000 rpm. I also had a 60 SP that would idle at about 1200 rpm. 2000 just seems a little high for what these engines are capable of.

Of course it took some very patient tweaking to get the idle down there, and if I recall correctly the idle mixture setting changed substantially going from a reliable 2000 to a reliable 1000, especially to keep it from stalling when throttled down from WOT. But it can be done.

Dave

(in reply to Rckfish)
       Post #: 11

Low Idle - 6/5/2003 6:29:50 PM   
Rocketman612



Posts: 2065
Joined: 1/19/2002
From: Enterprise, AL, USA
Status: offline 		Damnathius,
Are you using a glow driver? Also what prop since loading the engine more could be a problem ( or am I wrong on this? ) I'm planning on installing a glow driver to make starting easy and improve idle and low throttle reliability. Pete


_____________________________

"Remember, all im offering is the truth, nothing more..."
Morpheus

(in reply to Rckfish)
       Post #: 12

Brand New RCV 90 - 6/6/2003 4:25:58 AM   
Damnathius



Posts: 518
Joined: 9/28/2002
From: Lancaster, CA, USA
Status: offline 		Rman,

I'm not using a glow driver. I actually considered installing a driver on this engine, but after running it in on the bench for a few hours and getting it tuned, I determined that it just wasn't necessary, and just installed a DuBro remote adapter due to the cowled installation. The prop I am running on the 120 is a 24x8. I think that helps lower the idle by 100-200 rpm. The top end is 4400 with this prop. I believe RCV recommends not loading it below 4100 rpm at WOT. As for reliability, it just runs plain sweet, no questions asked. I do keep it a tad rich on idle and top end. Just remember that 1000 rpm at the prop is 2000 rpm crankshaft speed on the SP engines, which is a reasonable idle speed for most 4 strokes.

On the 60 SP I was running a 15x12 APC, and it would tach to about 5900-6000, so I definitely ran that one rich to keep the rpm down.

You have probably read this elsewhere, but flip starting these engines is a breeze as long as you can get them primed nice and wet.

Hope this helps.

Dave

(in reply to Rckfish)
       Post #: 13

Brand New RCV 90 - 6/6/2003 5:27:49 AM   
Rocketman612



Posts: 2065
Joined: 1/19/2002
From: Enterprise, AL, USA
Status: offline 		Damnathius,
Thanks for the info I know it will help. Yes I have read that they will flip start easily when primed but with it under cowl that's not easy. did you use a choke somehow or will it prime after several turns of the prop? Pete


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"Remember, all im offering is the truth, nothing more..."
Morpheus

(in reply to Rckfish)
       Post #: 14

Brand New RCV 90 - 6/6/2003 7:02:29 AM