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Don Fry

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Don Fry last won the day on February 11 2023

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  1. Yes, but the first time you leave petrol/ethanol mix in the engine after a few days, it starts to harden rubbers, and next you quickly get what looks like semi liquid chewing gum in the carb what quickly blocks the needle(s). No some folk claim they won’t forget, or are always in a position to perform the task. I do and am not always in that position. So I buy synthetic petrol, it’s cheaper and easier than repairs.
  2. Are you sure Paul, I used to use 98 octane when ethanol came to the 95 octane, but a few years ago, the 98 took on 5% ethanol and the 95 took on 10% ethanol. That was when I stopped using petrol for my stuff. Check the pump when you next buy some.
  3. I don’t use aircraft petrol engines. But I use small auxiliary outboards for my boat. I use synthetic petrol only. The water absorbed by the ethanol/petrol mix, causes all sorts of problems. So much so, I’m busy repairing peoples engines (spring, moter won’t start as it was not winterised). To keep the numbers down I do no favours, and charge main dealer prices, and tell them why it would not start. Surprisingly, I get repeat customers, always bleating “I forgot” (J'ai oublié.)
  4. Toto, listen to your mentor. Also trainers trimmed to straight and level flight, will climb if too much if more power is applied, remember throttle is the climb control. Ease back on the throttle
  5. Chicken hopper it is, works well, but the pipe flows, gradients have to be downhill towards the feed tank to the engine.
  6. I’ve just done some measuring. A laser 100 of that sort of era has 12 fins, and is 122mm from the bottom of the crank case to the top of the rocker box cover, ie distance off workbench to top of rocker cover. laser 150, same era, 12 fins, 123mm, measured as above. Note I seem to remember they shared a crankshaft, which makes some sense as the 150 is a lot bigger than the 120 in cylinder diameter.
  7. Never seen such a conversion widgit. To make them, small job on a lathe. Or pillar drill, as they aren’t precision things. Or for the more creative 2 bits of brass tube, slid and soldered together, and the oversize half suck in a drill and sanded to size.
  8. First off, an assumption there is a spar on the underside, near the lowest part of of the chord. So far, I’ve not found a wing that hasn't. Paint this spar with Balsaloc or Impex fast tack interlining glue (haberdashery shops). IF the fabric has not got a heat sealed glue, you need to paint all of underside structure. Leave to dry, then tack the fabric to the low spar. Then run over it again with the heel of the iron. Good tack, all the spar surface. Now, note well, when you do the rest of the surface, it will try to pull the fabric off the spar, get heat on the spar and the joint will fail. So I pin a spar sizes bit of wood, foam, whatever on the spar, can’t mess it up then. And then do the rest, front or back half first. Remove when finished. If using Solatex self glued type fabric, tack the fabric is the same. You can skip the Impex, but I don’t. I still use the protective temporary false spar. I use Ceconite (LAS). I don’t like the glue system. Smelly, messy, and I find just not needed on small aircraft like ours. I seal it with non shrinking dope. Reads more difficult as it is in practice.
  9. Caviate, I live in France. Am I missing something.. Down my local recycling centre is a steel bin for batteries. Any battery. I asked the bloke, if it was Ok to dump a 5s 4000 in there. It was discharged, wires shorted together. He is God. “of course” he says, “ but why the trouble to discharge it, we assume they carry charge, that’s why the bin is fireproof.
  10. Not when we start falling off perches.
  11. 15 x 4 will work, just make sure the throttle cut works. Occasionally the efficiency of the big prop produces enough power to keep the thing aloft. You can also try differential on the throttle, so it’s less sensitive in the positions you are flying in, so reducing workload.
  12. Pedantry I know, but electric motors are the older technology, 1820 and 1860 (ish)
  13. Why not just set the throttle arm to give 80 % power.
  14. I’m in both camps, depending on the cycle of my mind, get on with it, or I really want one of they, and I want it now. But one thing strikes me, over the years, sometimes a build stalls, because what you like just alters. I’ve got a Top Flite P 47, wood finished, glassing nearly finished, all servos etc have been fitted, fettled with control rods, ditto motor, ditto undercarriage and it needs painting and fuel proofing. No issues, nicely made. No longer interested in flying or maintaining that sort of model. I’ve been staring at the fus, standing on its nose in a corner by the central heating boiler for 15 years.
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