Jump to content

Log in or register to remove this advert

openspaceman

Veteran Member
 View Profile  See their activity

  • Posts

    9,930

  • Joined

  • Last visited

  • Days Won

    5

 Content Type 

Everything posted by openspaceman

  1. openspaceman
    The relative humidity of the air is related to the equilibrium moisture content of the log but there is a time period over which this equilibrium is established, it would take an experiment to see how this affects a log as we in the SE England are in a bit of a rain shadow so the humidity is often below 90% RH , which is a drying condition, albeit very slight in the winter. Also re hydrating slightly lags drying at the same RH. Also consider what we have been discussing about moisture meters, I suspect the tables one sees about RH, temperature and moisture content are based on moisture content on a dry weight basis and even in a wet place, like Dartmoor a 90% RH gives an equilibrium moisture content of <20% dwb which is between 16&17% on a wet basis. Of course you are nearer the sea than I so probably a bit more humid.
  2. openspaceman
    Do all the newer models start from cold on tick-over, i.e. there is no fast idle position when the choke is pushed in thus the chain does not spin?
  3. openspaceman
    Prove it. In fact I find some bits will dry down to 10% in the summer, then slowly increase in weight, but I don't think in sunny Surrey they will get above 20% again.
  4. openspaceman
    Thus is one for @adw but the 162 was the 60cc fore runner of the 266m 268, 272 saw series. IMO it the layout was copied from Jonsered as soon as electrolux brought both firms into the same holding, 70s. The device is a pressure take off for combustion gases to blow up a pneumatic lifting device inserted into the saw cut instead of a wedge. I never got to try one and they were not marketed for long.
  5. openspaceman
    Because they lose their magnetism? The Curie temperature for most magnets is 600C and above so the flue pipe would be glowing red before permanent magnetism is lost. Very wasteful of heat to let the flue gases exhaust above 250C.
  6. openspaceman
    @Al Cormack?
  7. openspaceman
    Very well observed and deduced Sherlock. That explains why it lay toward the lines, why no hinge and why the mess getting to it. BTW on this occasion the emergency crew had every right to access and do the work but generally a landowner can be paid to do the work himself, The DNO will stipulate that operatives must work to their rules and have utility arb qualifications but the regulations do allow for this.
  8. openspaceman
    Yes I thought so too
  9. openspaceman
    I can't quite put my finger on why I find this video attractive, yet another reason to revisit Belfast and the Antrim coast one day.
  10. openspaceman
    There are a number of things that limit how moisture leaves a log, one is the distance it has to move through the log, while a log loses most through its ends a split log can lose it through the sides. Bark is near vapour proof so a long length with bark intact means the water all has to move to the end and then evaporate, severely limiting how fast it can dry. In the limit with something like birch rotting will take place and as the end products of decaying wood are water and carbon dioxide the water content of the remainder is maintaining conditions for decay. Another limit is the moisture saturation (relative humidity) of the surrounding air, cold damp air doesn't absorb much moisture. If you heat air its relative humidity goes down and it can absorb more moisture, the higher temperature air also transfers heat to the log which increases the speed with which moisture can reach a surface.
  11. openspaceman
    I agree My worry with that approach is that the branches are over mature and there may not be adventitious shoots to form new growth. Once beech gets into middle age it doesn't coppice well, not sure about pollarding.
  12. openspaceman
    Cheeky bit of turf, you'd only pay for a written report if you intended taking someone to task for the damage.
  13. openspaceman
    He took your advice @Stubby because the thread I replied to was "Posted in Wrong fuel mix"
  14. openspaceman
    Tidy looking planking butt but for that rot pocket, nice prep and felling too.
  15. openspaceman
    Having jammed a clutch by snagging red baler twine I'm wary of cutting any ropes or fabric with a motor saw.
  16. openspaceman
    Very unlikely not to have done some damage. Pop the exhaust off and have a look see if the ring is free in the piston and no smearing or scoring, it nearly always affects the exhaust side first. You may be lucky and with fresh petroil in it it will run but take it gently.
  17. openspaceman
    Quite and I'm unsure what shock loading the body can survive, of course the body will deform to some extent and thus absorb energy and reduce damage elsewhere. In this case the OP is concerned with the shock loading on the anchor point. When I was a child fatality from minor car accidents were common so ROSPA, IIRC, attended local shows with a demonstrator to encourage the use of seat belts. It was a car seat and belt on a tilted rail such that the seat came to a sudden stop after accelerating down the short ramp and reaching around 5mph. The shock loading was hard enough even at that speed that a normal person would have had difficulty in not being thrown out of the seat without a belt on. Of course in most accidents the vehicle deforms somewhat and absorbs energy but a static climbing line...
  18. openspaceman
    If it absorbs shock on the body it also reduces shock on the anchor. The point of the simple ones is they rip stitching and in doing so slow down the body as the breaking the stitches absorbs some of the kinetic energy of the falling mass, they spread the smaller force due to deceleration over a greater distance. As tension in the rope is the same throughout this force is also reduced at the anchor.
  19. openspaceman
    You should also deposit a landowner statement under section 31(6) of the Highways Act 1980 with the planning authority and review it every 6 years, this makes it clear you have no intention to allow any tracks on your land to become rights of way.
  20. openspaceman
    Much too modern for me, mine have the mechanical controls, even so the controls only active the clutches don’t they? the reason for not returning the flow via the tractor spool is that the extra restriction heats the oil and if there is excessive pressure in the return line it can damage seals in the control spool. Is the tank separate from the final drive oil in the A60? I would expect it to be return to the final drive case somewhere, ideally under the oil level.
  21. openspaceman
    Not a lot in difference of green moisture content between ash and sycamore. Prejudice against sycamore because it is non native is a bit over rated IMO Mould is simply living off the more volatile solids in the wood until it dries below 20% and not much to worry about, airflow is the answer.
  22. openspaceman
    How many of your customers use it as a primary heat source? My total gas bill including standing charges is less than half that per kWh yet I still burn logs. Most of the logs I burn would end up mouldering away in the corner of a field so there's a reasonable displacement of fossil fuel, I could also save about a kg of char a day in winter if I were a bit better organised and use that in the garden to offset about 35 miles of motoring carbon emmisisions.
  23. openspaceman
    £93/cube is equivalent then
  24. openspaceman
    Not for me as I don't pay for my logs and I quite enjoy the few days it takes to cut and split. What weight do you allow for a bulk cubic metre of logs @ 20% mc? The pellets will have 900kg of dry wood at 5.3kWh/kg so ignoring combustion efficiency and extra steam up the chimney about 6.3p/kWh
  25. openspaceman
    It depends on how suddenly the falling object is arrested, if there is some flex in the system the force is less than a sudden stop. The terminal velocity from that drop is time=0.5gt^2 so ~0.2 sec acceleration is gt so about 2m/sev Force on the system =mass times deceleration so the faster the stop the higher the loading

About

Arbtalk.co.uk is a hub for the arboriculture industry in the UK.  
If you're just starting out and you need business, equipment, tech or training support you're in the right place.  If you've done it, made it, got a van load of oily t-shirts and have decided to give something back by sharing your knowledge or wisdom,  then you're welcome too.
If you would like to contribute to making this industry more effective and safe then welcome.
Just like a living tree, it'll always be a work in progress.
Please have a look around, sign up, share and contribute the best you have.

See you inside.

The Arbtalk Team

Follow us

Articles

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.