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HelicopterScale Model RC Helicopters › OS61 + 5-blade head
09-11-2007 12:50 PM  10 years agoPost 1
Bignose

rrApprentice

England

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I have a Sea King with Uni-Expert mechanics (10:1) and OS61 WC motor.
I would like to fit a 5-blade head to it (1500mm disc) along with the current 5-blade tail, but have doubts about the power required. Not sure if OS61 is powerful enough to swing a 5-blade head. Has anyone tried this, or more importantly, has anyone tried and failed?

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09-11-2007 03:29 PM  10 years agoPost 2
heliraptor

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Colchester, Essex,​UK

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Hi Bignose,

I know someone who tried a similar thing a few years ago and it didnt work out too well. Very underpowered, and I think in the long term would cause premature wear as it would be working so gard.

After spending the time and effort doing the Sea King, the last thing you want is to struggle to fly it. If it were me I would go the 91 route to help cope with the 5 blade head etc Sonme may say the OS70, but I think even this might not be quite enough.

Any way you can run it in pod and boom config with 5 blade head and weight it up to mimick the scale fuse ?

What is your target weight ??

You will also not be so restricted in the weight of extra detail etc.

Another outcome yes, but worth it in the long run I think.

Just my thoughts mate anyway.

Cheers

Lee

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09-12-2007 09:07 AM  10 years agoPost 3
Bignose

rrApprentice

England

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Hi Lee,
Thanks for the info, much appreciated.
Only problem (expense) is that I think I will need to convert to the Uni2000 mechanics to accomodate 91 engine. Unless anyone knows of a bigger engine that will fit the UniExpert mechanics.....
Mark.

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09-12-2007 03:54 PM  10 years agoPost 4
Boxer

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Norway

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Hi Bignose,
I am currently also building the Seaking (Century) and will use the Uni Expert mechanic. As i also planned for a 5 blade head for the future, and bought the Uni Exp non built and without engine. I have put a OS 91FX-HGL engine in the mech. The engine has the same size as a OS 61 engine, and fits directly without any problem.
I also thought a lot about the extra power and if it would be necessary to go for the Uni 2000, but could not see any big reasons. The 91 engine is to be used in a low rpm area 10.000 to 11.500 and not over 14.000), which would fit a multiblade fine with a 1:10 gear. At least this is my idea.
I have only tested the mechanic with the 91 engine in a pod % boom so far, but have some problems with getting the engine to run smoothly and with the tail kicking a bit as a result of this. I have yet not figured out what the reason is. I am now using it with a normal 2 blade head, and I am thinking about perhaps the load is to low for the engine, so that it is being operated outside the carburetors optimum area.

A 5 blade head would for me be something to try later, but i see no reason for why it should not be possible on the Uni Exp.
Regarding the Uni 2000, it is clear that the head is better (Alu) and that different parts are upgraded compared to the Uni Exp. Don´t take my comments as facts as i have not seen a 2000 next to the Exp for detailed comparison, but i have compared the spare part lists, and there are a lot parts common.

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09-12-2007 06:53 PM  10 years agoPost 5
Bignose

rrApprentice

England

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Hi Boxer.
Thanks for the information, greatly appreciated.
I think the idea of using the Uni 2000 mechanics as opposed to the Uni Expert mechanics is because you can change the gearing on the Uni 2000 mechanics, to suit the engine you are using. Also, had information from another RR member giving me good advice on how to beef up any Uni mechanics that use a 91 size engine. Perhaps your tail problems are due to the engine running outside it's optimum parameters? i.e. in a part of the power curve that is not linear?
Good luck with your project, and thanks again for the information.
Best regards,
Mark.

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09-12-2007 10:06 PM  10 years agoPost 6
Boxer

rrNovice

Norway

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I am not 100% sure, but i believe it is possible to us the same gear wheels as for the 2000 to change ratio on the Expert as well. Perhaps it is only a business idea to "keep the possibility for the 2000 only". Just my thoughts.

Pic of my Uni Exp, and the Seaking cockpit (with my sons Spiderman as a test "pilot"

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01-09-2008 09:06 PM  9 years agoPost 7
vinver

rrNovice

Enfield,NS Canada

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How big is Spidey?

Hi,
I have the Century Sea king too, how big is that Spiderman! Where did you the the seats, scratchbuilt or from a kit?
Thanks, Vince

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01-09-2008 10:10 PM  9 years agoPost 8
Boxer

rrNovice

Norway

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Hi, the seats are scratch built from depron, very easy to build.
The spiderman is from my son, and i think it was bought in a ordinary toy store. I have also bought some figures from Lord of the Rings, size is correct and they have them in Toys-R-us price is also not bad (10 EUR).
C

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