skippydiesel

"We encourage all members to take advantage of this opportunity and enjoy the savings on Avgas and Jet A1 fuel. Thank you for being a valued member of RAAus, and we look forward to bringing you more exciting benefits in the future." Hmmmm! I wonder how many RAA Jet A1 users are enjoying this wonderfully generous offer. As a dedicated ULP user the other New Year gift of AvGas is also pretty suss. Is this one of those politically inspired demonstrations of largess, with a zero cost/benefit to the proletariat?😈

"We encourage all members to take advantage of this opportunity and enjoy the savings on Avgas and Jet A1 fuel. Thank you for being a valued member of RAAus, and we look forward to bringing you more exciting benefits in the future." Hmmmm! I wonder how many RAA Jet A1 users are enjoying this wonderfully generous offer. As a dedicated ULP user the other New Year gift of AvGas is also pretty suss. Is this one of those politically inspired demonstrations of largess, with a zero cost/benefit to the proletariat?😈

This has caught my eye; Ultraflex B14 Engine Control Can see this being linked to a direction reverse lever/pivot, that moves a rod tp push/pull Cowl Flap up/down. Will contact suppliers for full dimensions.😈

I am with you all the way - intrigued by Blueadventures pull/push cable - have started looking into it.😈

With aircraft, marginal cooling, you really need to be ahead of engine temperature rises - Cowl open for Taxi/TO/Climb-Out. Open again down wind, so engine cooling before even touching down and in case of full power go-round.😈

I doubt if it ever got above 60C . This is the max under cowl temp recorded after flight/hot day.

FYI; Most suppliers of SCEET & SCAT are now selling in lengths of 3 ft to 11 meters BUT tend to quote in the cost per foot (to suck you in?). This can be quite expensive stuff to buy especially when only a small length is required and you are forced to purchase the minimum? SkyShop would seem to be in a minority of one - they quote & sell per foot SCEET - 8 (2in) @ $25.20/ft 😈

Hi Planey, Thank you for your kind & encouraging words. It seems to me that small/compact LA's would have many applications in small experimental aircraft, however this will not happen until they can be made reliable - a few hours of operation (cycles) before giving up the ghost, is not reliable. The reason for my optimise is simple - I find running electrical cables far easier than trying to do the same thing with the traditional levers & pull push cables.😈

It would seem that a compact/small linear actuator, with proven reliability, does not exist. There are much larger/heavier units available but then there are questions of space to fit and weight to consider, along with changes to existing bracket, shape, size/location. There have been not so subtle suggestions that I should avoid Chinese suppliers - FYI I have yet to find a single supplier who does not have his LA's made in China. I think I will fall back to a very simple system, that I have used on another aircraft to good effect - a winter & summer fixed flap. This will likely be a single flap with removable/replaceable air flow "chokes" ie more "choke" for winter less/0 for summer opps. Somewhere "down the track" a suitable LA may come on the market.😈

Me thinks you take the analogy to literally - so I will answer you in the same vain: If one or more of your control surfaces is jammed, due to the "Home Depot" plug having come loose, no amount of gas monitoring will save you🤣 "Besides, you should have a working CO monitor in any aircraft cabin to ensure you don't get accidentally poisoned by toxic fumes." You betray yourself, in your absolute confidence/dependence on third parties to make decision about your homebuilt aircrafts servisabity - Monitors do not prevent poisoning or anything else. They inform (IF working correctly) & IF the pilot takes note/notices, of a potentially dangerous situaton -IF!!! the pilot is in a condition to ameliorate the situation, they may save themselves. You could inform yourself about the quality of alternative parts but Noooo!, rather delegate this to a (usually) unknown person(s) who will issue you a piece of paper, inferring quality/suitability. As always I support your right to make your own decisions in this area. However find your logic both wanting and now, apparently, inconsistent.🤣😈

You guys - you want your cake and then when it suits a non certified cake. 🤣 It is now a fact, that you, will use a non certified/non OM supplied item, when/ where it suits you to do so. Your rigelling smacks of hypocrisy.😈

Oooooh! selective with our arguments, aren't we??? I think my point is clear enough - if a highly respected certified aircraft, advisory organisation, can recomend parts from a hardware store, the principal of substitution (where appropriate), is well and truly established. "It's only plugging off a cabin heat ducting ." - so? How do I know that the "plug" will not deteriorate rapidly, allowing toxic fumes to enter the cabin or fall out & interfere with the aircraft control systems, etc etc?? ".........for use as critical flight components" - what might the definition of "critical" be in this context?? Could it be a part which meets/exceeds all of the published (in my situaton by Rotax) specifications OR as you would have - supplied by the manufactures representative (dealership/agent) on trust with a bit of documentation attached & a high price tag??? 😈

I am an advocate for using less costly, non aircraft/certified/OM supplied parts, in the maintenance of experimental/homebuilt aircraft (particularly Rotax engine service components) subject to appropriate research of the proposed part. I am often receive very strong opposition to my advocacy, so its with some delight that I reference a small section of advice from a highly esteemed/respected organisation - The Bonanza Air Safety Foundation, "Detecting and Preventing Future Aileron Cable Damage Recommendations for Voluntary AD 2019-23-10 Follow-On Actions ABS Air Safety Foundation"; "If you do not require heat in the baggage area or aft cabin behind the 3 rd and 4th seats, remove the original ducting completely. Install a 2” PVC plug (Home Depot SKU 741 264) inside the plenum to which the original duct is attached, then use a #36 stainless steel hose clamp (Home Depot SKU 100 494) to tighten the hose around the plug. The clamp and plug may also be purchased from any of the building supply stores. You will need to sand the plug’s outer diameter down slightly to install it inside the flange with a tight fit." I believe "Home Depot" to be a hardware store chain.🤣 😈

Thanks mate!😈

Hi Gareth - which type do you have, SCEET or SCAT ?

??????????😈

What!!! Not a one with a bit of leftover SCEET ?? What about SCAT?😈

Looking for a short length of SCEET ducting , ID 2" , often referred to by Dash Number -8. 300mm/1 ft would be ideal. Will consider longer/shorter. Living in hope 😈

It is almost certain, that manned fighter/bomber aircarft are close to being redundant - the future will be drones & rockets of all shapes & sizes. This trend is also going to happen on/under the sea - so much for billion dollar subs. Military personnel will be a long way from the front line and relative, to past/current conflicts, few in number. The featured aircraft, if it isn't a computer generated fraud, is but part of a game of one upmanship - a distraction/propaganda 😈

Cowl flap is the full width of & conforms with, the shape of, the underside of my cowling and aproximately 150 mm wide. Hinged at the afte edge of the cowling (no possibility of jamming). When closed, conforms with/looks like, an extension of cowling bottom. When open, goes to about 45 degrees down, Will try & find a photo

Ah! 😈

I don't follow. I have been using LA's with a claimed 19kg extension force - many times what might be required to open a small flap, to say 30-45 degrees. The pressure, on the closed flap is minimal, as its function is a "choke' or restriction, not shutting of the air flow completely. The lower closing force of the LA is equally of no concern, as the air pressure against the flap will assist the retraction. The LA's, for their short life, have worked well. As earlier mentioned - a post-mortem of the first LA found that the motor still ran, the extension/retraction system still worked, however the stroke limiter circuit had failed, thus not allowing the reverse of current polarity to retract the system. The following are the specifications I have been working to: · Some resistance to moisture, dust & temperature. The actuator may be inadvertently exposed to water, during cleaning and in operation, air temperatures to 600C. · Extension range 20-25mm. · Working speed 5-10mm/sec (negotiable) · Thrust 20kg (negotiable) · Installed length (retracted) 75 -80 mm · Fully extended/retracted, built in, electronic limit switches (existing remote switch to reverse polarity/direction of movement) · No power “lock” in fully extended/retracted position. · Constructed of corrosion & vibration resistant materials · Current mountings 4mm ID both ends but could be modified. · Automotive standard 12V electrical cable The extension of 20-25 mm, will give an approximate 45 degree flap movement.😈

"repeated stalling of the actuator against a fixed load will shorten the life of the actuator". I do not understand. The LA's I have been using have two wires. Switch down - current drives motor - system extends - "hits" stroke limiter and cuts off current. Switch Up - current reverses motor - system retracts - "hits" stroke limiter and cuts off current. Note: There is no need for an interim position ie its either fully open or fully closed The above system can not repeatedly stall, as stroke limiters shut of current/drive at the end of each stroke movement. 😈

Nice one Garfly! 😈

Hi onetrack. This is the smallest 25 mm LA that MOTIONDYNAMICS have on their web page: This is dimensional idea (not the actual unit) of what I am after: