factory

I've just seen what it's for, a home-made centrifugal clutch, the other half is on your Fox engine. David

A picture of the other side would help, also does it fit the PTO shaft? I didn't see it in the lot originally so it may be for a pulley for another model engine. David

The seller of the parts also had a couple of engines that had been converted for RC model use (boats). Top one is probably a pulley, but does look a bit like the flywheel used on the much older small Ohlsson model engines that weren't used for model planes. The other is possibly an adaptor for the PTO shaft, again for RC model use. I have a slightly longer one that came with an early parts engine, that was used to rebuild a Tiny Tiger with a damaged crankcase and other missing bits. David

It appears that Fox Motori who supplied the 22cc engines for the Turbair Fox also made a backpack sprayer with the same engine, see here: http://www.foxsprayers.it/en/about-us/history/ Also found a parts diagram for the Fox Motori F7 engine here:http://www.foxsprayers.it/wp-content/uploads/2016/12/Motore-F7.pdf A while ago I scanned the Turbair Handbook which features the Turbair Fox sprayer on page 5, it was uploaded as a pdf here; David

Certainly looks very nice, it's also one of the rarest O&R tools.

I'm fairly certain that the above aircraft is a variant of the Bensen B8M Gyrocopter with an Ohlsson & Rice powered pre-rotator for the starting the main rotor blades (not fitted in the pictures). Bensen also made a Gyroglider, which is the same but without the 4-cylinder McCulloch engine. Not sure why the tank is fitted to a rotating part. The only info I have on the pre-rotator is this corner of the drawing saved from ePay and some pictures of another complete pre-rotator with an O&R engine, which originally had a red engine starter & tank. I can't any information for the Bensen gyrocopter being used as a drone, but the McCulloch engine was used in a drone, I have found a picture of one here; http://www.chainsawcollectors.se/phpbb3/viewtopic.php?t=3934#p30037 It does appear that the USAF had 3 Bensen autogyros which were part of an experimental Discretionary Descent Vehicle (DDV) program, but this idea was abandoned at the end of the Vietnam war, more info from NASA here, on page 34; https://history.nasa.gov/monograph31.pdf The prototype of the Bensen B-8M Gyrocopter dating from 1957 is on display at the Boeing Aviation Hangar at the Steven F. Udvar-Hazy Center, Chantilly, VA. Pictures here; https://airandspace.si.edu/collection-objects/bensen-b-8m-gyrocopter If you look closely at the first picture in the link you can just about see the O&R engine, I suspect the O&R engine was added in the 1960's as the earliest ones date from about 1961. David

As far I know they don't make the 2-stroke petrol version any more. Could the tank not be repaired or is it missing? David

Some manuals for the battery & mains electric versions of the Turbair (now called Electrofan) are available from Micron here; http://www.microngroup.com/files/electrafan_12_manual_-_english_(rev__4).pdf http://www.microngroup.com/files/electrafan_240_manual_-_english_(rev__3).pdf Looking at the parts diagrams it appears they haven't changed much over the years. There is also a video on youtube of the battery powered Turbair, compare it with the old picture in post 7 where virtually no protective clothing is being worn! Link below; https://www.youtube.com/watch?v=3XCRxDGdm0A David

Do you still have the sprayer for them? Butanol based cleaning chemicals are still widely used. I wonder if Isi-Butanol is a PBI brand name for Iso-Butanol. Acarcides are a type of pesticide, containing different chemicals depending on what they are used for. The book posted above says it's a mix of Dicofol/Tetradifon, Dicofol is still used but limited in use per year/crop. Can't find anything useful info for Tetradifon though. Based on the description Dicambate appears to replace others in the book above, can't find any info for it on it's own though. Anyone reading this should check for current info on the chemicals to find out if they are banned or restricted and how harmful they are. David

Welcome to the forum. Don't throw the original bottles away, these machines which are still being made & used (with a different shape bottle) are often sold without the bottle. Yes many of the old pesticides are now banned, such as DDT & Zineb (not in all countries though when I checked), but some are still available such as certain types of Acaricide & Malathion, I haven't checked all of the list in the brochure above. If the contents are not wanted they could be transferred (wear gloves as the concentrated chemicals are probably harmful) into a modern bottle, labelled and disposed of properly. Though some people working at waste/recycling centres haven't a clue what to do with chemicals, I took a jar of chemicals to my local waste/recycling centre & when asked where to dispose of it, he took it off me and threw it in the bottle bank with the contents. Anyone reading this should check for current info on the chemicals to find out if they are banned or restricted and how harmful they are. David

Found a better picture of the Paul Bunyan decal, from the Chainsaw Collectors forum, thread linked below; http://www.chainsawcollectors.se/phpbb3/viewtopic.php?f=118&t=12848 Looks like some had this decal instead, another poor quality picture saved from ePay. Here are some pictures of a yellow Chip-A-Saw that sold recently. David

A teaspoonful of oil poured into the cylinder is the standard procedure recommended by O&R for any engine that is going to be stored, even if only for a short time. The oil is then spread around by cranking the engine several times at various angles, also the piston should be stopped half way up the cylinder to block the exhaust ports. There is a thread discussing preparing these engines for storage here; Also see the challenger chain saw manual I posted here; It's the later model 20A engine but the storage procedure is the same, see page 10, It also mentions emptying the fuel tank before storing and running the engine till it stops to remove fuel mix from the lines & carb. When the engine is used again the preservative oil remains and causes blue exhaust that quickly diminishes. David

Found the webpage with the Octura adverts; http://collectair.org/vintageengines.html The Octura/O&R engine and adverts are about half way down the page. David

Is the Military green O&R this one ? If it is it's almost certainly a type 133 engine (that I mentioned in post 6) presumably sold as military surplus at some point, looks like a previous owner thought about using it for a model boat. The page with it is not a marine manual, it's a printout of the Octura ad that is on another website (I can't remember where it's from but I have it saved too). You should send Wallfish pictures of the crankshafts needed for your Tiny Tiger, as there are different types depending on the age of the engine. If you edit any pictures to reduce the file size you will be able to post a few pictures on this forum. David

Hopefully the attached pdf I have created of the parts list/diagram & operating instructions will be useful in rebuilding the compressor set. Ohlsson & Rice Orline Compressor Parts List & Operating Instructions 1969.pdf David

Wallfish and Webhead have some spare parts for these engines, hopefully they can sort you out with the part that got broken if it can't be repaired. Is the unused Military engine a type 133? Quite a few of these have turned up over the past few years, I have never found out the intended use for them though (there is almost no trace on the web when I researched the military part numbers), I don't think they were spare engines for the military version of the Champ generator though as the mounting is different. David

Are they getting confused with converting for running on RC glow fuel? Diesel would need a higher compression ratio. Also how would you lubricate the engine and would all the rubber seals be OK with diesel? Have you got any pictures of you O&R engines? David

See this thread for some pictures of the other Chip-A-Saw. David

Here are some pictures of the Paul Bunyan & Chip-A-Saw chainsaws, pictures saved from ebay. David

I imported a pair of these chainsaws a few years ago, but as the original decals are long gone I'm not sure if they are Paul Bunyon saws or not. Here are some pictures of one of them. I have since seen this saw branded as both Paul Bunyan (spelling is correct) and the Chip-A-Saw, here are the decals from those. Does anyone know which is correct? David

The 13B252 engine/carb diagram & 13A starter instructions have already been uploaded as PDF's in the engine diagram & manuals thread I started here: The 13B252 engine is the type fitted to the Webb Little Wonder hedge-trimmer I have, I suspect my short Little Wonder hedge-trimmer would be the same type, but someone pinched the cylinder plate with the serial/type details. The starter repair instructions appear to have been supplied with a starter cord repair kit for some tools over here. I have some other engine diagram scans still to upload there. David

I guess the repair shop that originally had that manual, must have been one that actually paid the yearly upkeep charge. Here are some pictures of the O&R tools in a garden equipment catalogue from 1967. David

According to a post on this site; http://www.collectorsweekly.com/stories/32713-a-pony-express-bicycle-engine Advanced Engine Products went out of business shorty after changing the name of the bicycle engine from Chicken Power to Pony Express. Note the change of address in Webhead's Pony Express brochure from Los Angeles, California to Eden Prairie, Minnesota. There was a TV ad for the Chicken Power bicycle engine, it can be found on youtube here; https://www.youtube.com/watch?v=RNtHBEdZDYs Here is an ad for the Pony Express bicycle engine from Popular Mechanics magazine May 1978 that was scanned by google. David

There are more pictures of pmackellow's Tarpen Mini Engine powerhead & Tarpen Flex rotary cultivator in this O&R thread that was created before the O&R forum moved here; I don't think there are many Tarpen Mini engines about as they offered many adaptors to power the Tarpen Flex range from mowers, tractors and other machinery. David

Have you checked if it's the piston/cylinder or the starter mechanism that's the cause of it being seized. I had one of those later style starters with the starter reel seized due to corrosion, I never managed to un-seize it and noticed a couple the thin alloy sections of the housing were cracked, so ended up buying a replacement from Webhead. David