Alan Hilton
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Posts posted by Alan Hilton
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Hi Jon
An isocyanate is a 2 pack .Aerosols have a pull pin to release the hardener and have s short life after activation .As. John posted the solvents are best not inhaled and will likely pickle enamel paints . Tho polycynate is too vague to identify
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Since air is about 78% nitrogen and the gas laws were worked out using air before chemistry really got going I think this nitrogen stuff is a money grab
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It’s a common problem .An exothermic reaction heats up the reaction mixture .A rule of thumb says that rate of chemical reaction doubles with a rise of temp of 10 degrees C and so it goes on .Mix small quantities at a time and use a wide pot .
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The seagull bowers flybaby is another good model .It’s very similar to the spacewalker but smaller at 69” span I have a 6 cell electric setup in mine
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Hi David how about a pic?
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The O ring on the bottom of the carb is a source of erratic running if it’s in poor condition (crankcase compression loss)
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I use a pair of blunt side cutters
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That’s right they use carbon reinforced depron
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Have a look at the jetworks website ,they have downloadable plans for edf jets .The plans are for smaller edf units but they can be printed at different sizes to suit your fan . There are files for 3D printed parts as well
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Thanks chaps I have gone for a toolkit dual charger from 4max .If it comes up to expectations I will get another .I have a dual output power supply so no problems .The reliability issues with the gt4 put me off
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31 minutes ago, Shaun Walsh said:
Thanks Shaun that looks like what I’m after
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I would like to buy the above ,please could I have some recommendations
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I have used 4 max motors esc’s and servos with no problem .I don’t know where he gets his stock from though
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Mix your own using micro balloons and emulsion paint
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Brilliant film thanks for posting
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I have just tried to order a durafly vampire costing £120 they wanted about £120 postage from global I didn’t go ahead .Has anyone had the same stupidity ?
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I used the 4 Max recomended prop with an 8 cell battery and I haven’t checked the current draw .Its only had one flight so far it’s well powered but I don’t have much idea of flight time yet
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46 minutes ago, Martin Harris - Moderator said:
I certainly agree that flutter is a model killer but I think that a weak servo is unlikely to cause it. It might even act as a damper!
The cause is usually aerodynamic - flexible linkages, poor static balance, play in hinges, excessive gaps etc.
Although plastic gears are more likely to fail if flutter is encountered, metal ones are more likely to develop play which might lead to flutter…
Totally agree with this
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I had one back in the day with a supertigre 2500 It had 3001’s all round with no problem A metal gear on the elivator isn’t a bad idea if you have one
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Curie point for iron is 770 centigrade so magnets would work
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Bolt from the back into a threaded handle perhaps
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Cordless tools have pushed battery technology over the years as well as mobile phones
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6 hours ago, Richard Wills 2 said:
5 litres at 50:1 is 98ml of oil
5 litres at 30:1 is 161ml of oil
Adding 60 ml will get you to near as needs be 30:1. If it was me I would probably run it as it comes also.
That’s what I made it , there isn’t a law of conservation of volume so it’s not an exact science .Adding 100 ccs of oil to 5000 ccs of petrol doesn’t have to give 5100 ccs of 2 stroke
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Nice one Ron
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Precedent Stampe 1/4 Scale
in Build Blogs and Kit Reviews
Posted
Hi Bert
Are you doing it like the tiger moth ?
Alan