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Prop/reduction box matching
Hi Guys
My KF Mk2 has a C type gear box with a ratio of 3.47-1 on 582 grey head. Prop is a 66" 3 blade GSC .I have the chance to obtain a 68" IVO light 3 blade.Do any of you Guys run this combination (had no success with enquirys in Uk).Its not so easy to mess around with props over here, the CAA ask many questions,and may even want to do a noise test(at my expense ) so I am being cautious.If any one runs this combo.and it works well would you please let me know,it might be worth my while to bite the bullet and go ahead with change over.
Fred
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Re: Prop/reduction box matching
Hi Guys
Just in case any one else might consider this combination,when there was no feed back I contacted IVO themselves.They recomend a medium prop for 3.47:1.
To use ultralight prop I would have to change ratio to 2.62:1.Back to the GSC
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Senior Member
Re: Prop/reduction box matching
Fred
I am amazed that the LAA said that. I ran an IVO ground adjustable Ultralight prop on my Kitfox and the LAA were fine about it. It was a 582 with a C box and it worked an absolute treat.
I have changed aircraft now to a Mk 5 so I don't have it any more but I know for sure that the Ultralight IVO is definitely cleared for flight on Kitfoxes in the UK without having to complete a Mod4 form.
Go to the link below and have a look on page 16. My Mk 4 (G-PHYL) was cleared for a 68 inch IVO. You will see there are also a few other Kitfoxes that are cleared for the same prop too.
http://www.lightaircraftassociation....20Aircraft.pdf
Hope that helps.
Last edited by Monocock; 01-25-2011 at 02:09 PM.
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Re: Prop/reduction box matching
Hi Monocock
Thanks for reply and info.The recomendation was from IVO themselves,not the LAA.It seems 3.47:1 reduction is not used on 582 KITFOX,not in UK anyway,that is why I asked the KITFOX community on this forum.This reduction works well with 68"3 blade GSC but I want to be able to alter pitch in minutes,not hours
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Senior Member
Re: Prop/reduction box matching
No worries. I'm just confused now because all of the paperwork that was with my Mk 4 had the C box down as a 3.47 ratio and this was signed off by the LAA at the initial test and when I put a new blue top in last year.. Also see the fourth paragraph in the link below, as the 582's in the UK Skyrangers also have 3.47 boxes too. Maybe they have printed that wrong too, I don't know.
http://www.flylight.co.uk/skyranger/options.htm
I don't know if you have considered a Kiev prop? I know they operate well on many 582's in the UK. I recently went through a Mod 4 form process when I took the GSC off my Mk 5 (vibrated like hell due to tracking issues and GSC kindly gave me a full refund). Because the Kiev is installed on lots of other 912s engines in the UK (Foxbat, Skyranger etc) it was a simple £25 and a two page form to get it approved. The process would be the same with a 582. As I understand it, the only time a full 25 hour test procedure is required is when a prop has not been matched with an engine before.
There are lots of Kievs on 582's and they are very good value at around £700. They run ever so smoothly/quietly and setting up the pitch is a 15 minute job with the Kiev pitch tool. (I don't have shares in Kiev props, I just cannot belive the difference it has made to the aircraft!!).
I agree with you that the GSC looks nice though - I just couldn't do with the vibration I was getting right through the whole power range.
Last edited by Monocock; 01-26-2011 at 06:24 AM.
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Re: Prop/reduction box matching
Hi Guys
Took a chance and went for IVO light ,guess what,it dose not work ,pitch not coarse enough for this reduction.Never too old to learn,usualy the hard way.My error might just save someone else from making same mistake
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