saramos

Just curious, what prop are you running?

Scott

mboland

a 15.5" x 12" 4 blade.
Used a 20" x 12" 2 blade to run in on the test stand but the 2 blade is a little large for the model.

stkr

Would the RCV .91 SP be a good choice for a Top Flite Fw-190 D9 ?

mboland

The 2 essential criteria needed to even guess that would be the wingspan of the model and the weight.
The Corsair I put the 120SP into is only 64" but weighs 6kg and had adequate power, a 63" Spitfire at 5kg is pulled very nicely by a ST90 2Stroke (120SP equiv power).
But a 63" Giles 202 at 4kg has more than enough power with a ASP61 (90SP equiv power).
Hope this helps.

tyr2473

I have a 60+90SP AND ALSO A 58CD. The 60 was long in running in. But once it had been run in, it ran quite smooth and always starts first time. Also for a 60 four stroke, there is loads of thrust. The 90 on the other hand, vibrates alot, and was actually starting to dig its way into the fire wall of my Hanger 9 Corsair. That engine was replaced with a Zenoah g20ei Titan. The 58cd isn't quite run in yet, so its early time yet to tell how that will work out. Incidently, the 58cd will be going into my Flair Neiuport 17 when I finish it.

tyr2473

I have three RCV engines. 60+90 sps' and a 58 cd. Will RCV ever bring out a petrol variant? I do like the RCV engines, but metholine is outragously expensive!

tyr2473

Mboland, why is it that you seem to be the only one that I have ever herd from reguarding these engines, that has the problems you do?

mboland

Hi tyr2473, If you search the forums you will discover there are other RCV customers with almost exactly the same problems. I have been trying to get in touch with any RCV 120SP owners that have actually had some air time on the their motors. There seems to be plenty that are thinking about them, have just purchased them, have just run them in, but I hear nothing from users that have a lot of flights on their engines. I did mamange to track one down with a PM and he was happy with the engine except that it is a slimer. A german customer with a similar experience to mine just happens to be a motor engineer, we had an interesting discourse.
I also own a 58CD which runs reliably, quietly and with no vibration. I am very pleased with this motor and would recommend it to anyone.
The 120SP on the other hand has very real problems in the motor design, and if the final test of the last engine fails, which will be this week, I will be forced to take legal action to recoupe some of the over $2K spent on these.

CLBetten

My Feedback: (16)

I have spoken of the pleasure my .90 SP has given me in the past. Given the fact that W8YE has mentioned it here also ( I got it from him) and the fact that mine has now become a long term survivor at about 100 flights I thought I would chime in again. I have found it to be as consistant and reliable as any four stroke I have ever owned. It just seems to get smoother and quieter the more I run it. I can't claim any experience with heat issues since I do not have a cowl. I can say that the 8 foot Lanzo Record Breaker it is in has a 1937 era undercambered airfoil and is like dragging a barge. I have always run a 18X10 prop. and 15% fuel with 18% castor/synthetic mix. I fly at about 4500 feet elevation year round. It has developed a pretty good single "POP" if I transition from full throttle to idle quickly but I think it just shows character.

Take care, Cliff

g_boxwood

I've been reading this 3d since I'm seriously considering to get 2 60-SP for my 87" CL-215 @ 14.5 lbs expected.

Will they be adeguate? I plan to use 3-bladed props in the suggested diameter/pitch combination (13.4/13.5 IF I recall correctly).

One question I do have is about breaking the engines in: is there anything special about the procedure? or better yet: what is the procedure?

It has never been mentioned BUT I think that it is an important issue for the life of the engine and I'd be glad to get some infos about it.

Many thanks in advance.

mboland

The Corsair I have comes in at 13lb and a 120SP was 'adequate'.
A VQ Macchi 220 with a 60SP was 'scale' in its flight performance.

My suggestion would be 90SP at least.

The VQ Black Widow at 89" recommends 120 size 4 strokes (20 to 22lbs)

I would also recommend you run them in for at least a few hours, until you can get the mid to low end happening without the surge that seems inherrent in all new SP's.

mboland

Sadly I have a final solution from RCV on the 120SP problems I have encountered.
"‘RCV have, as a matter of good will, offered to fully reimburse me with the cost of the engines in spite of the fact that it considers the failures are due to aspects outside of its control’"
The local agents here in Australia, Command Controls, were just giving me technobabble answers full of holes and wrong facts, despite (or is that because of) having Mr Brian "bulldust" Winch, as their technical adviser.

RCV would have to be one of (if not 'THE' ) most accomodating and responsive companies to deal with.
I will probably be getting another 58CD for a small P40 I have repaired as the 58CD I have has performed flawlessly and clocked up many, many hours of air time.

The 120SP's on the other hand have a problem here in Australia, and my observations and investigations indicated that it was the 20% oil mix the local agents were telling us to use.
RCV resolved the issues before I had a chance to test the final motor to destruction to prove it.

So anyone having vibration problems, and/or overheating problems with their 120SP, try lowering the oil content to ABSOLUTELY no more than 15%, of which 3% to 5% MUST be Castor (this is RCV's recommendations as per their manual with the motor).

I look forward to any feedback on this.

Bottom line: if you are having any problems with an RCV motor, deal with RCV UK direct. You will be assured of satisfaction.
Just watch out for local agents in "excuse mode".

Kmot

My Feedback: (24)

I thought this chart of engines manufactured by Sanye in China might be of interest.

mboland

That certainly explains a lot of what is going on with these motors.
It does NOT explain their inflated price though.

FokkerAce

RCV:
Building a 64" span, 1100 sq in WW-I bipe from old [1970's] plans, asks for a .60. Needs a 15" scale prop. 7-8 lbs.

Will your RCV 91-CD fit the bill?

RCV Engines

Hi

Thank you for your enquiry.

Yes the 91CD will fit the bill, we would suggest a 15 x 6 prop.

Many thanks and kind regards

Stephanie

nilsreinert123

Hi

I have a 90SP mounted in my topflite 190 60 size, i have not flown it yet ,since i have som problems with the engine ,it is very difficult to start ,and it will not idle . Any tips on what i am doing wrong?? When i turn the engine over when cold ,it feels very stiff.

It doesnt feel very powerful either ,probably it is barely enough power for the fw190 .

mboland

The fuel mixture is critical with these motors.
No more than 15% oil of which 3% to 6% must be castor (this is in their instructions).

The idle needle must be set correctly or you will get horrendous vibration at mid throttle.

What maximum rpm are you getting?

They also need to be very wet to start, make sure there is plenty of prime (is your fuel tank high or low compared to the carby?)

These motors also need to be run in for EXTENDED periods, like up to 10 hours, before they even start to free up.

The 120SP's I had were VERY tight when cold but were free when warm.

I would be interested to hear how you get on with this motor.

nilsreinert123

The max rpm i got last time was about 5100-5200 rpm. My engine also feels very free when warm ,i have run it for almost an hour total time.
I have not set the idle needle yet ,so i probably have to work on that one

nilsreinert123

Think i found an ok setting for the idle needle now ,ran the engine for long periods ,and it got more reliable. Maybe i take the first of all flights with the fw 190 d9 tomorrow

mboland

Just remember, you CAN destroy these engines with the wrong fuel.
And they run HOT, very HOT.

Brokenprop

My Feedback: (6)

What is the optimum nitro content with the low oil content?

mboland

RCV recommends 10% in their manual and no more than 15%.

FokkerAce

anyone got an opinion between the 90 sized CD or SP to which will tolerate a close cowl better?

thanx, FA[8D]

Pit-Viper 1

My Feedback: (12)

I would say the CD would tolerate it better, just do to the design, SP's are harder to cool. Guess alot cool do with the cowl as well..


Shane