Snorbitz
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Everything posted by Snorbitz
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And finally some finished shots.
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The rest of the fuz interior complete with air bottle and reciever all wrapped up in blue foam. The 2 plugs tied up at the top of the pic to the air filler valve are battery monitors but i've run out of y-leads to plug them in at the moment but i'll be closly monitoring the voltages inthe early stages anyway so its not a great problem.
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And with everything connected up. The opto isolator is cable-tied to the underside of the panel between the fuel tank and the retract valve switch. I wrapped it in foam to be safe. Its a shame you can't see it on here but you can see where abouts it is i hope. The small white tie is the position. You can also see the yellow foam i am using for the battery mount. They slide in from this side and are secured with a closing panel and yet more cable ties.
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Inside the fuz the fuel tank was secured and the other electrical goodies started to go in. You can see the strange angle the throttle cable passes through the f/wall at but it works just fine. i fitted remote switch control...they look like pitot tubes on the outside. I think they are better seen on a later photo.
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Engine on and plugged in. The yellow hook thing if you're wondering under the silencer is connected to the choke lever so i can operate it from the front with the cowl in place. I cut the exhaust at an angle to be proud of the cowl but still roughly follow the lines. Edited By Shuglu on 16/08/2010 23:55:51
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I drilled the wooden block to allow the fuel lines to pass through it for tidyness. Breather and filler lines come out the sides and the carb line out through the top. The ignition module fitted snuggly into some vibration protection and into the gap at the bottom of the engine bay all secured with a cable-tie. The opto isolator was mounted on the other side of the firewall and no extensions were needed.
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Its been a while since i last updated you on things so this lot should bring you right up to date. The engine fit has gone very well. I dummy fitted everything first which is a lot of work but worth it in the end. So for starters i fitted the spacing block supplied with the model but needed extra spacing so i used the models nylon engine mounts as they were the correct thickness as well as the actual engine mounts to get the correct firewall to prop-driver face distance. You'll hopefully get my drift from the photo.
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I asked my friend about the oil situation and his explanation comes from Kart engines which rev to extremely high numbers and what he said was over time oils build up a glaze on the inside of the cylinder and to change straight to another oil even from one different mineral to another requires a process that he calls "re-washing" which is effectively a way of slowly washing away the old build ups and replacing them with the new. He has known folk change straight from one to another and they have siezed their engines as a result. It kind of makes sense to me but then maybe i'm being overly careful.I think i still have the copy of the magazine you mention so i'll look that out later. I'm afraid i don't subcribe any more....still buy it every month though..
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I've just been talking to a friend who "knows" his 2 strokes and he says that when the time comes to change to synthetic oil i should treat the engine as if i'm running it in all over again. Interesting thought. Sometimes a sudden change to synthetic can be very damaging. I ran the engine to max revs just briefly over the weekend prior to taking it off the test bench and was pulling 7500 rpm with the 18x8 Master Airscrew. Surprising how anything thats not bolted down tends to blow around in the draught!!!. Its still early days yet but the idle is very good now with just a little vibration. Our club is invited once a year to fly at a local event which is on the 8th August so my mission now is to get the plane finished for that. I'm on holiday next week so progress should be quite quick after the weekend. I'm aiming for a maiden on the Thursday/Friday to iron out the bugs.
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RCM&E 2010 Hobby Awards
Snorbitz replied to David Ashby - Moderator's topic in All Things Model Flying
1.Als Hobbies2.Inwoods3. Hangar 9 Pulse XT404.MacGregor -
Just a little update as to where i am with things. The engines now done 2.5 hours of bench running and i now have (after a short delay) my 18" prop to fit. I'll do another couple of 20minute sessions then i think it'll be time to mount it in the plane. Hopefully all in and plumbed up by the end of the weekend. I purchased an "Easy mixing bottle" which incidently i've seen offered on some popular model web sites with the oil fuel ratios marked on the side so you don't have to measure it out so acurately and the first time i used it i poured a measured amount of fuel and oil in only to discover that its quite a bit out in its calibration so i double checked my measuring jug and 50ml syringe. They are fine but the mixing bottle is at least 50ml out which is miles out so when you consider the small difference between a 25-1(40ml) running in ratio and a 40-1(25ml) normal running amount per litre. If i'd just gone by the bottle readings i'd have ended up with somethng like a 13-1 ratio and a very black spark plug!! So i'll have to look into that some more to see what can be done but theres a warning there...if you're going to get one of those types of jugs try to have it measured accurately before you use it regularly. Don't go borrowing the wifes best pyrex measuring jug caus you ain't going to be her best friend for a while if you do. It would explain why so many folk can't get their petrols running nicely though!!I'll be back with some piccys on Monday and tales of how smoothy the engine fit went. or not!.
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Lets buy British!
Snorbitz replied to andy watson's topic in R/C Retailers / Distributors / Manufacturers
The kiwi's actually actively promote themselves on the radio over there. On a recent trip i heard them say one of the main radio sations "Buy from another Aucklander caus ya never know when they'll need to buy from you".or words to that effect. Now initially i thought thats a bit off but when i though about it longer i thought they're absolutely spot on...why not self promote...we do very well a knocking ourselves down here...some shameless self promotion wouldn't go a miss sometimes. Just a pity the products aren't always up to it as mentioned in earlier posts.
