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OS 61RF-P with unusual carb

Old 02-23-2018, 05:42 AM
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Niall
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Default OS 61RF-P with unusual carb

Guys,
Picked up a new Hanno MK1 (3034) and an 61RFP recently. The RFP has an unusual carb with standard throttle arm and a servo arm for what I believe is high end adjustment. anyone ever run one of these ?

Thanks
Niall
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Old 02-23-2018, 08:10 AM
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do335a
 
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Once had a 90 size Rossi fan engine which had exactly that sort of arrangement.

The arm on the high speed needle was for in-flight adjustment of the fuel/air mixture, as it is on your OS 61.
Old 02-23-2018, 03:22 PM
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Very nice engines (the Hanno is one of my all time favorites)! Yes, that carb on the RFP is for in flight mixture control. Seems a bit unnecessary on a pumped engine. I have thousands of flight on my Hannos (I keep a log) and the high speed needle rarely needs adjustment; only when there is significant atmospheric change. That looks like a two nipple pump on the RFP which is not original. The original had 4 nipples: fuel inlet from tank; fuel return to tank; fuel outlet to carb; fuel return from carb. Is the mixture control carb an OS carb? Or aftermarket? It looks very well made.
What airplanes are they going in?
Old 02-24-2018, 03:15 AM
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Hi,
Thanks for the responses.
Its an OS carb and has 2 nipples on it. The seller spoke with Hobbico who say it was a rare "special" version made by OS before the Hanno arrived. I'm going to put the Hanno in a Summit made be Leo at BAC. Currently flying electric pattern but want to have a bit of fun with vintage pattern. It will be my first 60 two stroke since the 90's

Niall
Old 02-24-2018, 08:22 AM
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flywilly
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Hi Niall,
Thanks for the information. Can you post a photo looking into the exhaust port of the RFP, please? I am wondering if it has the porting upgrades of the Hanno without the red head.
Which Summit? 1, 2 or 3?
-Will
Old 02-24-2018, 07:21 PM
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Indeed they are nice. Great find(s).
Old 02-25-2018, 04:13 PM
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Originally Posted by flywilly View Post
That looks like a two nipple pump on the RFP which is not original. The original had 4 nipples: fuel inlet from tank; fuel return to tank; fuel outlet to carb; fuel return from carb.
Will,

not sure what you mean. To me it looks like a standard four nipple RF-P pump unit. The Hanno naturally has the simpler two nipple pump unit.

David
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Old 02-25-2018, 04:27 PM
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Yes,
I just glanced at the photos and didn't see the return line on the carb. I would now surmise that it is a stock RFP with the carb added after initial purchase. I have seen that carb on an OS 160FX running without a pump. Considering the price of that carb, whoever swapped it from the original would have been better to spend the money on a new Performance Specialties (Nelson) piston/sleeve. The version released for the RFP (prior to the Hanno) had some porting changes (especially to the exhaust duration) which added 400-600 rpm depending on prop used. The RFP in that configuration was pretty close to the Hanno in power.
I am amazed at the number of NIB Hannos still in existence!
-Will
Old 02-27-2018, 04:13 AM
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The oldest Version RF had 2 lines from pump to carb Hanno had 1 , the ekstra arm isnt that unusual its a meetring to adjust high end in the air , those times pretty helpful.
cant remember what the second line on the RF really was for ....
Old 02-28-2018, 11:11 AM
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Niall
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Originally Posted by flywilly View Post
Hi Niall,
Thanks for the information. Can you post a photo looking into the exhaust port of the RFP, please? I am wondering if it has the porting upgrades of the Hanno without the red head.
Which Summit? 1, 2 or 3?
-Will
Hi Will,
Looks like the standard porting of the RF i.e no elongation of the port exit on top like in the Hanno. I'll try to get a photo up at some stage.

I'm going for the Summit 3. Leo at BAC has just finished the fuselage. Can't emphasize enough what great customer service Leo provides!!

Niall
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Old 02-28-2018, 01:25 PM
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That will be a great combination. Ivan campaigned the original very successfully! Will you be going with Shamrocks in place of Maple Leaves?
Old 03-01-2018, 01:18 AM
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Now there's a good idea
Old 03-01-2018, 05:26 PM
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Ha!

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