Jon H
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Posts posted by Jon H
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1 hour ago, Philip Lewis 3 said:
If it climbs when inverted the c of g is way too far back, no matter what the plan says!
Maybe not.
I would check wing incidences before doing anything else. For a biplane like that i would guess 0,+2,+3 for tail, lower wing, top wing. It is a guess though. See if you can find a plan on outzone for a similar model and do a comparison.
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4 hours ago, ARC said:
just quick update , had no reply to email and no response to calls from LMS for my 155 needle or carb. Have give up . Cracking engine sitting useless on shelf !!!
Stand by. Ill be back...
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If the slow run needle is too lean the main will become unresponsive on an st carb. When it comes to cleaning I have hooked up my fuel pump to the carb and blasted it that way.
Another issue is the spray bar being in the wrong place. St carb spray bars are adjustable and it could be out of whack
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6 minutes ago, Applewood said:
I'll have a look at the tank, it's currently huge and looks to be behind the COG,
What? It must be more than a foot from the engine?! no wonder it needed pressure. A 12oz tank is all it needs and that will fit in the bay in front of the wing.
APC prop is fine, wooden one would look nice...just avoid master airscrew.
replace the needle if you can, or remove the abomination and replace with a thin wire soldered on with a support in the cowl. Helicopter canopy mounting rubbers can be useful for this.
Pipes. One clunk, one vent to forward facing pipe hanging out of the cowl, one fill/drain.
10 minutes ago, Applewood said:Any more advice is warmly received
Be careful pulling G on the airframe. The top wing centre section design is pretty naff and depending on a variety of factors its not hard to tear the wings off. I dont let others fly mine as their exuberance may remove the wings. I break my dummy flying wires all the time despite having substantial slack in them. You can still fly aerobatics, and i do with mine, just be gentle.
When i build a new one i will modify the wings to make them stronger. The model was designed to weigh half of what they do now, with a merco 61 at the front and no ability to do aerobatics. Times have changed, the model has not, mods are needed.
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40 minutes ago, Ron Gray said:
Sorry Jon, I have to disagree, having used them for many years on both petrol and glow with no problems whatsoever. They also provide a big advantage when plumbing for a Laser V twin in that you only need 3 tank outlets.
I used one, a dubro, and it leaked. So i replaced it with another more expensive one, and that also leaked. The latter one lasted a while, but both were rubbish and they were a constant problem on customer engines so they are in my naughty books forever!
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1 minute ago, Ron Gray said:
Unless you are using a filler valve of course!
Booo, horrible leaky unreliable..... 😛
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56 minutes ago, RottenRow said:
three-way tee-piece
yes i was confused by that as well
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It's a year 2000 manufacture 150 so 18x6 would be my prop of choice. The previous owner clearly had running problems, probably due to poor tank placement, and has fitted a pressure nipple to try and compensate. This won't work and the nipple is already leaking so will fall out eventually. Lower the tank and install on the fuselage floor to fix all the problems.
Oh and screw the exhaust extension further in. Its barely hanging on by a thread and will fall off.
I just spotted the Brunel inspired needle extension. This will vibrate and snap the needle off. At the very least mixture will be all over the place. Change for something lighter
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8 hours ago, SiBee said:
On my high speed taxi checks
I agree with Chris and would not recommend this sort of test for the exact reason you have already described. Takeoff is the time a model is most vulnerable and a fast taxi is a dangerous halfway house. If the model is ready to go, just send it. I trim slightly nose down for a maiden flight to help fight against a steep yank off the ground due to a bump or high rate on that first takeoff. I essentially run it in a straight line until the curvature of the earth gets the model in the air and only use about 80% throttle to protect myself from airflow in the cowl or other weirdness causing the engine to go sick. Once up the first order of business (assuming the model is stable and climbing out) is to get the gear up. I do this to clean up the drag, and because the wheels are in the way should i be in trouble and need to plonk it down in the field. I cannot understand why people fly around with their gear down. It makes absolutely no sense at all. Anyway with the gear up just maintain runway heading for a bare minimum of 10 seconds before you even think about a turn. Then its the usual trimming and so on, stall test/elevator flap mix setup. By now 5 minutes are up, bring it down, wing off, check remaining fuel and for loose articles, put it back together and go again with any rates changes applied.
In the case of the typhoon you need to fly it and see how it is. All of my warbirds are trimmed for a moderate level cruise sort of speed and the climb under power, dive under reduced power, and want to lawndart themselves with the gear and flap down. This is where the elevator flap mix comes in and you effectively set an elevator offset to trim the model for the landing configuration. With the model trimmed to a speed just under stalling provided you never touch the elevator on approach you cannot stall the model as a reduction in speed below the trimmed speed will result in a natural nose drop to regain the trimmed speed. You can adjust the rate of descent using throttle and float it on in.
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I am with Ron on this one.
I have the La7, Sea Fury and P39 currently flying with each being more than a decade old and all using their original retracts etc. They did require some fettling during the build, but generally they perform very well.
The Typhoon has a very short nose and lead is to be expected. Near 20lbs is a little porky for a 72 inch model, but you might be able to trim some fat if you remove some lead after the test flights and/or modify the installation to get it further forward. I found the c/g recommended to be ok, a little nose heavy but not awful. Their recommended rates however are miles off, particularly when it comes to elevator. My sea fury was a right handful on the recommended rates and i now fly with a low rate of about 5mm. This is all it needs, and its probably still nose heavy.
Anyway the typhoon has a thick wing and large flaps. Dont be shy with the flaps, get them down a good 45 degrees, use elevator/flap mixing to retrim the model (you will need nose up trim with gear/flaps down) and fly it in on throttle without touching the elevator. The approach will be steep vs a sport model and you must always be descending. Once the nose of the model rises above level it will all be over very quickly. Long flat approaches with power are doomed to fail, do not even try it.
For example, i have this exact model and its a pussycat to land using the right technique. Do it wrong and it will bite you hard. Watch what happens as soon as the nose rises. The speed bleeds off immediately and its all over. If you can see a shadow under the wing of your landing warbird its bin bag time.
On the canopy issue, if you can get it off mostly in one piece you can cover it inside and out in thin fibreglass, then cut out all the windows to leave just the frame. You can then replace all the windows with some clear acetate or similar. Bit of a faff, but it will look great.
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10 hours ago, Simon Chaddock said:
Of course on the Fokker Triplane the aileron actually extended beyond the wing tip.
Horn balances are there to help prevent flutter by balancing the control surface. They often have a big chunk of lead in them for this purpose. They also provide aerodynamic assistance to the pilot making the controls lighter and easier to move. Looking at the drawing above there seems to be no mass balancing and its all about reducing the control forces.
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Thanks Alan for collecting the Jabberwock on Friday. Enjoyed the chat as we put the world to rights, and a spitfire fly over was also not bad.
For those waiting for me to send your stuff im sorry for the delay. I have just been so busy the last few weeks my various admin tasks have been neglected. I also lost last weekend due to plague and have suffered some lethargy after work last week due to the rather warm conditions. I have however found a post office open late though so hope to get things moving.
I have also been informed that another batch of stuff is due. Looking at the photos sent its not high value stuff. a number of half built models, some gliders etc, but if i can get even a tenner for each that's going to be fine. I am due to collect the stuff on thursday and will post photos.
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I favour having some wingtip after the aileron for the simple reason that a ground loop or other event can cause a wingtip to hit the ground and rip off the aileron as there is a gap for grass or whatever to catch on.
That is a fairly niche issue though and in flight it makes little difference either way
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At work i regularly glue rubber seals to metal and use loctite 480. Its a rubber infused cyano designed for this sort of job and its very strong. Its useless at sticking to acetal though, so i dont know if the foam you are sticking to will be something it likes. Do you know what sort of foam it is? I just did a google search and was a little surprised by the price of this fancy glue. I hose it on with gay abandon at work so it must cost the company a fortune.
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Just for an update items sold are:
Stuka
Jabberwock
radio queen kitplayboy kit
FSR 40 engine
Small sport/trainer.
Thanks to you guys for that.
The rest of the items are still available and open to offers.
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It looks nice and i was tempted to keep it myself (as with half the stuff) but i have too much on the go as it is so someone else should enjoy it.
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Another kit. Nice looking model with a pre built wooden fuselage and foam wings. Not quite artf but close.
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1 hour ago, Basil said:
I am looking for a '61' if you have one available please.
Regards Bas
The only 61s in the mix are the two Merco engines and they are spares/repairs. I'm really not looking for big money for them. 15 quid the pair plus post and see what you can make of them
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Last engine is an os 40fsr with original box. Runs well but needs new bearings. Must be worth 40 quid surely? Its still an os after all
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More stuff for you all to muse
Enya SS40, nice clean condition and ran very well on test today.
Enya 35v-BB. Dual ball raced and ran perfectly on test. The only negative is the exhaust clamp/screws are a bit deformed and in need of a little fettling.
Another Enya 35v but this time a plain bearing version. Runs perfect but no exhaust.
OS 10. No exhaust, ran ok but i dont think it was a fan of my slightly wonky glowplug. Carb probably needs a thorough clean as well.
Boxed OS 15. Ran quite well but also wasnt a fan of my test glow plug.
OS19. Weakest of the bunch with fairly soggy compression. Ran, but probably best considered spares/repairs
HB20. I wasnt able to run this as it didnt fit my bench but it seems to be in good condition.
Mills 1.3. Runs nicely and seems in generally good condition. There is a hairline crack in the fuel tank but it does not seem to leak. The carb is missing its air bleed cut off lever so i have plugged the holes in the intake with a small piece of heatshrink tube so its an easy mod to reverse. I think the backplate might also need a new gasket but its nothing major. The prop driver seems to have had a repair to its rear face i suspect to repair overtightening damage. It works fine at the moment but might need a new one in future.
little sport type model for 20 ish size engines. Made of some kind of laminated foam over a balsa frame. I think EZ models used a similar construction. Nice little thing, needs a thorough run through with glue as many of the joints are no longer friends.
This kit is really nice. 60 inch P47 new in box complete with pre curved sheeting for the fuselage sides. I didnt even know that was a thing! The box suggests the kit is from 1976 but the canopy is still clear and everything is in really good condition. its 5 channel by design (no retratcts) but could easily be modified for full house. Its miles clear of the seagull version from today and im a little sad i cant keep it myself.
Not looking for mega money on the engines, a price near the size of the engine would probably be about right in most cases. The small sport model could be a nice little bargain but the P47 really isnt for giving away.
As before, if you are interested in anything shoot me an offer over.
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Thanks to those who have been in touch. Looks like the Stuka, Radio queen kit and Jabber have gone.
A few engines today. These are the poorly ones and are for spares/repairs. I am sure they will be useful to someone.
Merco 61 x2 with one muffler. Both locked solid with castor, one has a bent crankshaft.
A pair of fox 25's. One is assembled, i believe complete but locked up with castor. The other has its cylinder removed for some reason but seems more or less complete.
Fox 19 dismantled in a bag. It looks like all the parts are there.
Fox hawk 60 dismantled in a bag. Again i think its all there.
These are the ones i consider 'dead' or at least beyond repair in the time i have available to mess with them. I plan to test run the other good engines tomorrow and will list them once im done. There are more kits and things to come, its just taking time to pick up and appraise everything.
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5 hours ago, Paul L said:
I'll be keeping an eye on this. Where in the country would pickup be?
Aylesbury bucks. The kits aren't too bad to post but collection is favourable as I didn't count everything and it allows the buyer to satisfy themselves all is well. I'm probably being over cautious but better that than flogging a lemon.
The engines are likely to go cheaply. 10-45 quid I expect but I'll run them up and see
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1 hour ago, Ron Gray said:
Will that fit the older carbs Jon?
yea should do. The oem jobs might still be available from ripmax but their website is throwing a fit so i cant find it
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Im assisting the friend of a passed modeller who is trying to sell off the chaps gear and get a sum together for his widow. I bought some engines off the chap and through the conversation i offered to help as neither he nor the widow really were in a position to deal with it.
There are kits, engines, models and while some is probably not worth a massive amount there are some nice things there too. Models will clearly be collection only, and i would favour collection if possible but some things can be posted in a pinch.
So far i have the following ready for sale.
40 size trainer, no radio, covering needs attention but solid with an enya 40 2 stroke in good condition. I was able to fire up the engine without any trouble and while it only ran on the prime as i didnt fill the tank i have no reason to suspect it will be a problem.
Giant jabberwock with ST2000 engine. No radio, good condition generally but the engine is gummy with castor and might need bearings. The wing struts are missing and a small repair is needed to the top wing where a mouse ate it.
60 size stuka. no radio or engine, fuselage ok but wing needs substantial repair.
Well flown radio queen. No engine or radio, evidence of a few battle scars but generally solid and only in need of minor repair.
Playboy Sr, i believe new in box. I had a scan and it looks complete to me but be aware i didnt count every stick and screw.
As above, im pretty sure its all there but didnt count every piece.
Prices...? Whats a 40 size trainer new these days with an engine? £250 at least? With that in mind is £70 unfair? Not looking for top dollar but equally i want to be able to pass on something respectable to the widow. The ben buckle kits are about £160-180 new, £80-100 seems pretty fair?
If you have a sensible offer by all means get in touch. There are more bits to come i just need to run up some engines. I have 10, 15, 19, 30, 35, 45,46 size engines (enya and OS) to run. There are some fox engines which are going to be spares/repairs (no time to mess with them). There might be some diesels if i dont buy them myself, details to follow once i get them sorted.
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Unstable model
in All Things Model Flying
Posted
what about insufficient? My small hurricane did some similar things due to very low incidence.