facthunter Posted July 9 Posted July 9 Any rubber shock absorber will deteriorate with use. Maybe number of starts and stops would have an effect. Also is it neoprene or rubber predominantly? Rubber is affected by petrol and mineral oil. Nev
BrendAn Posted July 9 Posted July 9 On the xair it's easy to check the carb sockets each preflight. I always have a look at it , but as you can see there is no support apart from the rubber socket.
Thruster88 Posted July 9 Posted July 9 Like a Thruster, you can keep an eye on the engine as you fly. 2
BrendAn Posted July 10 Posted July 10 34 minutes ago, Thruster88 said: Like a Thruster, you can keep an eye on the engine as you fly. yes. easy to maintain and inspect. can't beat rag and tube for buzzing around the local area. 1 1
skippydiesel Posted July 10 Posted July 10 It strikes me, that those of us who discuss engineering systems, all have some concept of "perfection" (don't take me too literally). Where perfection is wanting, we call that poor engineering (or worse). Over many years of tinkering, I have come to realise that what might, at first glance, be categorised as poor engineering (rubber socket/inlet manifold to carburettor) just seem to work despite the naysayers. Rotax carburettors are actually supported, at least in part, by another engineering oddity, a spring. At least this is compatible with the vibration reducing rubber - it just doesn't look quite adequate and is in an odd location - again it just works.😈 1 1
Red Posted July 10 Posted July 10 (edited) 8 hours ago, danny_galaga said: What sort of rego was it under? I don't suppose we'd see ANY kind of report if this happened in Australia... UK permit to fly, which allows the great majority of maintenance to be carried out by the owner, with some work (eg on the control system) needing to be signed for by a competent second person and some work like modifications needing approval by the overseeing organisation (BMAA, LAA) and sign off by an inspector Edited July 10 by Red
Red Posted July 10 Posted July 10 5 hours ago, skippydiesel said: It strikes me, that those of us who discuss engineering systems, all have some concept of "perfection" (don't take me too literally). Where perfection is wanting, we call that poor engineering (or worse). Over many years of tinkering, I have come to realise that what might, at first glance, be categorised as poor engineering (rubber socket/inlet manifold to carburettor) just seem to work despite the naysayers. Rotax carburettors are actually supported, at least in part, by another engineering oddity, a spring. At least this is compatible with the vibration reducing rubber - it just doesn't look quite adequate and is in an odd location - again it just works.😈 As I've mentioned in my experience it just works for a less than adequate time period. If you look at the installation manual, Rotax actually states fitment should include a supporting airbox, the omission of such in many uncertified aircraft is done for a variety of reasons, mainly space and weight constraints 1
facthunter Posted July 10 Posted July 10 Skip,You get "thing" when people don't respond to your questions and then dismiss their contributions when the do.. It JUST works. is a poor analysis. Try giving that answer in an engineering context, It's failure Mode should also be TAKEN into account also. Essentially failure of the Powerplant without much warning. Might as well be a broken major component as far as the effect on continued flight iis. Simply LABELLING some as "NAYSAYERS" is BS and insulting. .. Nev
skippydiesel Posted July 10 Posted July 10 1 hour ago, Red said: As I've mentioned in my experience it just works for a less than adequate time period. If you look at the installation manual, Rotax actually states fitment should include a supporting airbox, the omission of such in many uncertified aircraft is done for a variety of reasons, mainly space and weight constraints What is the "time period" you refer to? - less than 5 years, 5 years, more than 5 years? "Rotax actually states fitment should include a supporting airbox" - Take your word for it but I would point out they also support the minimalist individual conical filters (part number 825551) that are almost ubiquitous, in this part of the World.
facthunter Posted July 10 Posted July 10 Thet only keep out grasshoppers and large rocks anyhow. You can see through them from one side to the other. Where's your engine anti Icing? Nev
BrendAn Posted July 10 Posted July 10 54 minutes ago, facthunter said: Thet only keep out grasshoppers and large rocks anyhow. You can see through them from one side to the other. Where's your engine anti Icing? Nev 9 series don't suffer from icing much because the carbs are on top where the warm air is. 1
BrendAn Posted July 10 Posted July 10 1 minute ago, BrendAn said: 9 series don't suffer from icing much because the carbs are on top where the warm air is. a tecnam i did lessons in would ice up a bit when 1st started but clear as soon as the engine temp started to rise. 1
facthunter Posted July 10 Posted July 10 You are braver than ME.. with just those conical filters. . Nev
danny_galaga Posted July 10 Posted July 10 (edited) 1 hour ago, facthunter said: Thet only keep out grasshoppers and large rocks anyhow. You can see through them from one side to the other. Where's your engine anti Icing? Nev A lot of 912s, including mine have a water jacket around the throat. Initially I was still in 'carb heat ' mind set thinking that's a waste of power because it's always on. But there is virtually no difference in power because all it is doing is keeping the throat surface warm, preventing icing. Great idea, after all that's the bit you don't want iced up, not the air/fuel mix. Note, there is also an electrical version. Edited July 10 by danny_galaga 1 1
facthunter Posted July 10 Posted July 10 I've had experience with an electric one on a HKS. I reckon you DO need something, and it has to be demonstrated to work. Nev
BrendAn Posted July 10 Posted July 10 14 hours ago, danny_galaga said: A lot of 912s, including mine have a water jacket around the throat. Initially I was still in 'carb heat ' mind set thinking that's a waste of power because it's always on. But there is virtually no difference in power because all it is doing is keeping the throat surface warm, preventing icing. Great idea, after all that's the bit you don't want iced up, not the air/fuel mix. Note, there is also an electrical version. i have only been involved with 6 912s and none of them had the heating options. my jabiru engine has an electric thing on it but i don't know if it helps much. 2
CT9000 Posted July 11 Posted July 11 Of course you can add a turbo (914) no need for carb heat because the compression of the intake air ( boost) increases the temp. 1
facthunter Posted July 11 Posted July 11 Not used on descent. . Icing is still catching people. Alcohol spray plus heat is used on P&W R 2000. with supercharger. Nev 1
CT9000 Posted July 11 Posted July 11 5 hours ago, facthunter said: Not used on descent. . Icing is still catching people. Alcohol spray plus heat is used on P&W R 2000. with supercharger. Nev Rotax deem heat is not required on their turbocharged engines. 1 1
facthunter Posted July 11 Posted July 11 Do "special Laws" of physics apply to them? Does it all stay hot when the throttle closes. Nev
facthunter Posted July 11 Posted July 11 Deemed is a strange word to use in Aviation. Involves belief. Nev 1
spacesailor Posted July 11 Posted July 11 No icing as no " moisture in the air " . According to my exam paper ! . spacesailor 1
onetrack Posted July 11 Posted July 11 I don't see anything wrong with CT9000's use of the word "deem", it means "to form or have an opinion, (to) judge, or (to) think". Dictionary.com | Meanings & Definitions of English Words WWW.DICTIONARY.COM The world's leading online dictionary: English definitions, synonyms, word origins, example sentences, word games, and more. A trusted authority for 25+ years! 1
Red Posted July 11 Posted July 11 On 10/07/2024 at 12:24 AM, BrendAn said: On the xair it's easy to check the carb sockets each preflight. I always have a look at it , but as you can see there is no support apart from the rubber socket. Brendan, what is that black round thing with a rod or tube sticking out of its centre that appears to be directly behind the air filter element? 1
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