jeff2wings

Can confirm that they convert to diesel well ,the FP's are a a better engine than the LA series as far as idle speed I aim for 2,500 -2,800 on the ground and use thr idle down function on landing approach

Same here this is very good news, have used their fuels for years 👍

Couple of flights with these two this afternoon maiden for the Seagull sport i10 finally after hanging around my workshop for the last 9 years!

Got too run both the Enya and TT90 today the Enya started second flip of the prop! The thunder tiger needed a spin with the electric starter, the extra shim making top end tuning a little less fraught Enyas like saitos always seem to be set up a bit rich on the lower end from the factory, smoke on! TT running strongly on its 14x8 jfx prop

Richard pm sent

Maybe you or leccy could draw up some plans and add them on outerzone, if I hadn't been so excited about building one after so many years would have done it myself 😐

Nice one leccy👍nearly put a bid on it myself but that would have just been greedy, just love flying mine !

An idea Jim Walker came up with some 70 years ago,l would be interested to know way a need for a pump inthe first place? A YS pump system although designed for 2 stroke operation

So in direct reply to the op then the Perry pump suggested by Robin would fit the bill,it sorted out a problem for a club mate a long time ago with a very early saito that had the carb mounted directly to the head Lazer style in a vintage model, red zephyr I think, the tank being a lot lower it would only run 1/2 a 4oz tank but the pump ment it would use all the tank. Brian's suggested system may have been more about directly pressurising a tank directly for a smoke oil tank,four-stroke engines have a much better fuel draw the there 2 stroke equivalents

You can use crankcase pressure on four-stroke and irc Brian Winch explained in his column how,basically most pumps use the + and - pressure pulses in the crankcase on a two stroke as it draws in a fresh charge and the pumps it into the cylinder, this obviously is not the same process in a four-stroke but the action is still the same in that the crankcase volume increases and decreases with every stroke, thereupon producing +and- pulses which requires the vent,it's not just there to let the oil out! So in oder to use a pump Brian suggested using a second crankcase vent with a one way valve to admit air on the up stroke and provide a positive pulse on the down stroke for the pump or directly to the tank, in effect the same as using timed pressure on a two stroke.

Sherman - 210 AC/DC Tig however half way through the first one I run out of gas ! Luckily I was able to drop in to my ex-works and use the Miller transtig 350 ,bit out of practice so for me it's a little untidy but looks better after it's machined off !😄

Project for today OS 120 fs silencer

Last little job on the TT 91 is replacement of the damaged push rod tube Hopefully will have time to give it a run up this week

Funnily enough I'm having a similar problem with a couple of TT91's but that said they do have relatively high compression at 10.1 and aggressive cam timing, both have very low run, both have gone slightly lean in flight and subsequently stopped from detonation, in fact one knocked a big end so this mornings project was..... will have a play with fuel and plugs but mot likely add a shim

Interesting comment about throwing props at idle? Only ever had it happen at max rpm,will see what happens when I run it. Anyway bearings arrived from model fixings this morning, excellent service from tthem as always. crankshaft cleaned up ,just some very light surface pitting but not onthe bearing surface Cylinder head straight out the u-son no combustion residue at all and no sign of polishing action on the camshafts and no scuff marks on the piston =this engine has never run👍 Clean as a whistle! ready for the test stand and running in to start 🙂

I have 6 four strokes 1 120,2x 90,46,41 and a open rocker 35 plus numerous 2 strokes like 4 ss40 's that are like OS fp's but better 😄

Enya 90-4c restoration So in other news I was looking for a 90 four stroke for a current project and thought I would use my NIB Enya that I had on the shelf, nice I like Enyas........ Ah,there it is ......except when I opened the box I was confronted with an engine that had dirt encrusted oil all over it and was locked solid!😲 hardly NIB then,but l'm sure when it was in the display cabinet with my other Enyas it was immaculate........and it still is ,,this is one I took a gamble on from eBay (think I paid around £90 for it)as the seller thought it was unused but didn't know for certain as it was an estate sale and I had just forgotten I had it ! ☺ Duh . So I forgot too take a picture of it as it came out the box but here are some of it being stripped for cleaning. quick dip in the U-son cam housing back of the main case front end separated after a good blast with a heat gun umm,new bearings please...... hopefully bearings will arrive tomorrow and I will pop it back together over the weekend

Nice pipe work Keith hope you got ear plugs 😄 I did have another go at running the JJ but as I adjusted for max rpm the engine would choke and drown with excess fuel, basically the four small transfer ports have been cut somewhat oversize so I will be making a new liner and piston x2 to go with my own new build, but use the simpler style Webra porting rather than the HP porting, but that will have to wait for the darker evenings to arrive 😀!

Making an absolutely cracking job of it there Nigel a nd I do like a biplane or two myself! Looking forward to seeing the end result 👍 is this going to have ep or ic

That's a very nice build, the finish on the crankcase and anodising look very smart and silencer fitting very neat, however the os E 3030 is to small for this engine as it's meant to fit engines of .35-46 range and will cause excessive back pressure resulting in over heating and poor top end performance. This has more volume and a 10mm outlet

Got a NIB kit off evil bay last year for less than £70 ! So there maybe more out there so keep looking or maybe one that's seen better days and refurbish it,they fly So well it's worth the effort 👍

Brian Peckham RCS free plan 1985 on outerzone

You can machine out the valve cages and install new,or it my be the ring is sticking causing the low compression,without disassembly it's hard to tell how its been (miss)used

Have a couple of plans for the D Va ,Mike Booth that was a free plan a Ziroli one at 1/6 scale, and a Dr 1 byTony Lunt at 1/5 scale that's a lovely set of drawings just to look at, Pfalz D111 at 1/4,Fokker D VI ,RE8 etc etc......plans take up a lot less space and a good deal cheaper than kits 😁 one day, one day.........

Given up on building the Dr 1 DD?? At 70" makes the D 111 1/5 scale so a 90 would be quite adequate, 20-30 cc for 1/4 scale at 88"