Chris Walby
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Everything posted by Chris Walby
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Trebor, I'll have a look once the glue has set on the bulkheads, but if I remember rightly Jon suggest it would be okay. if it needs modifying apparently "its only wood" and the main thing is there is plenty of room in the nacelle anyway. Progress today was painfully slow although I have the new bulkheads in place (25mm further back) and made a start on the instructions Aileron and Flap horns epoxied in and aileron servos fitted. Hopefully install aileron and flap push rods tomorrow with wingtip covers (hoping UHU-Por will be okay for this). I'll try the engine in the wing with the cowl to see how it line up and then if its okay get on and brace the boxes up. Thanks for following and any questions/suggestions please chip in, ttfn
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One cup of tea, another of coffee and the decision confirmed at the flying field between bouts of flying is to move the bulkhead. I tried the exhaust and carb at all kinds of angles with the exhaust pointing up and the slow running screw only possible from the other side of the nacelle. Nice try but the more I looked at it the messing later on to get everything to work. Engine stays where it is and move the engine mounts back 25mm (including bulkhead) + the benefit the bulkhead does not look like a tea bag and the carb linkage lines up nicely + the exhaust points directly down now Slightly worryingly was the ease it all came apart. Bulkheads are on the to do list tomorrow.. plus a bit of gluing.
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Ace, I tried all kinds of engine positions and how I was going to hack the cowl etc... Jon just said to put the tank under the nacelle box... I find simple solutions the best...even if I have to be told the obvious ! PS The Dual Ace is a reasonable cost kit and flies very nicely (well I think so) so that's what I am cutting my teeth on (see my build log and importantly other peoples comments). Go on you know you want a twin! Disclaimer. Other models and engines are available... but where's the help and advice if you need it.
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BEB, My long post just auto deleted Plenty of room and will have to extend the exhaust to get it out of the cowl. Exhaust air will exit via U/C aperture or I'll see it I can make something on the back of the rad cowl (to stop oil blowing about). The cowl will need to be cut to get it into place and that will allow a section in front of the cylinder head to provide inlet cooling. Jon suggested a scallop or two in the bulkhead to allow the carb inlet/linkage which is no issue as the tank won't be in the box. That will allow some useful bracing to be put in to make sure the bulkhead is secure. Ian, Thanks for the heads up, I'll look to turn something up, cheers. This is only my opinion, but I think Seagull are making IC models that can be converted to electric at this size which gives the electric guys a challenge getting enough weight forwards. My Seagull Dual Ace is on twin 70 comes out just light compared with the 2 stroke/electric guys who have to add lead to get C of G, so win win! I might need to put the RX lipo further back (like the Dual Ace) to get C of G but its way better if slightly nose heavy on the 130mm C of G point compared with getting everything forwards I like the convenience of electric, but its just not the same for me when you roll into a low pass with a pair of 4 strokes sounding so nice..... I'll keep up dated on the build and see where things work out.
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I have a pair of Laser 70's running 12 x 8 (8 pitch to get it through the noise test) and a bit of a ground clearance issue (keep knocking tips off the blades!) and with the forthcoming mosquito build I was just thinking about 3 bladed props? For the Mossie they will look nice and as long it flies scale I am not after ballistic performance. Questions I assume a 11 x 7 or 8 three blade would be okay from a performance point of view? Are 3 blade props louder/quieter than comparable 2 blades? Any idea where I can get decent 3 blade ali spinners?
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Very nice Martian you have done a cracking job and expect generated a lot of interest. Do you have an idea of gear you will be using and what's the published AUW? Thanks for the great work.
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Its all starting to come back to me regarding Jon's comments having re-read my notes. The positioning of the 70 is quite tight against the engine box and I need to decide if I need to nibble the odd corner off to make enough room or not. A spot of drilling new holes for the engine mounts against the bulkhead and measuring to ensure the spinner will clear the cowling and its looking like a plan Jon suggested some additional bracing and during the general handling a couple of the existing joints came loose so there will need to be a through dribbling of the Deluxe glue to make sure it all stays together. Cowl trimming should be interesting for maintenance although it looks like it could nearly hide in there! I'll add the rest of the spec in once I get a bit more done. Any questions or comments then please post.
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Good service from Ripmax
Chris Walby replied to Phil Francis's topic in R/C Retailers / Distributors / Manufacturers
I broke the flap switch on my Spektrum DX8 gen 1 a couple of weeks ago, phoned Al's hobbies and had a chat. Very helpful and mentioned one of his engineers had just returned from Spektrum training course and I could pop in or post it to get it fixed. He enquired on my soldering skills and said they could dispatch a spare switch for me to solder in. Turn up 2 days later, fitted and working a treat..perhaps the tide is turning? -
Jon, Martin, Again not ideal flying conditions up at the field yesterday and things will have to wait for someone else to have a go as the engine is now out of the Speed Air although I think I have come to a conclusion. The engine performance was faultless despite spins, loops, inverted 8's and dive tests...some but not all at WOT for extended periods. Conclusion...Its me So thanks for you help. I think two things are happening, firstly the engine starts to load up as the dive angle decreases and secondly its the Doppler effect as the poor old Speed Air airframe is whistling so I think its at its VNE Time for another project..
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Well the time has come...and I must start with a thank you to Jon at Laser Engines for his assistance and all of the other Seagull Mosquito owners for their build threads which have been most helpful.. If the Dual Ace is anything to go by and I really hope it is a pair of 70's should fit without too much lead to get the C of G. So alas poor Speed Air as I need a engine template and I am having too much fun with the Dual Ace to spare a couple of 70's although they will migrate there in the end! Quick taster and then I am off to do lots of measuring.
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Seagull Dual Ace Laser Build
Chris Walby replied to Chris Walby's topic in Build Blogs and Kit Reviews
Right ho, back from the flying field, too blustery for the Dual Ace, but okay for the Laser 70 Speed Air So AUW with dry tanks C of G is 105 so I am with cymaz and it flies very nicely That's where I started and finished...if it isn't broke, why fix it (I don't plan on flying mine inverted for any length of time!). While on the subject of flying the Dual Ace, I have it set up as per book with the low/high rates. I found the low rates a challenge as it took up a lot of sky with some steep bank angles, where the high rates and some expo is much easier for me. Lastly apologies for teaching you to suck eggs, but it needs to be flown to the ground. Cut and glide and it will bite Good luck and let us know how you get on. Edited By Chris Walby on 31/07/2018 20:12:58 -
Seagull Dual Ace Laser Build
Chris Walby replied to Chris Walby's topic in Build Blogs and Kit Reviews
I have correct C of G as 95 to 110, but I'll check my manual and my model as I am sure it was in that area, most probably towards the 95 end. Flies very nicely and roll are reasonable (bit of elevator needed but not excessive). It lands quite fast as is and with the C of G at 85-90 it might mean a very express arrival at the landing strip. I'll get back to you, Chris -
Tony Nijhuis 72” Mosquito – Build Log
Chris Walby replied to Geoff Gardiner's topic in Tony Nijhuis plan builders
Geoff, watching with interest, my BH mossie needs everything as far forward as possible to get C of G. Just love the U/C and doors. -
yobmot or backwards Tomboy
Chris Walby replied to Chris Freeman 3's topic in All Things Model Flying
Interesting as to what all the required changes are? Wing tip plates Turn prop around and change rotation of motor Turn wings around Move C of G to "canard" Reverse rudder control Reverse or turn around elevator/horizontal stabiliser PS looked to fly better than some of my attempts are were travelling in the direction intended Again thank Byron for his efforts, nice one. -
Flew twice and one other pilot braved the windy conditions with the rest talking engines and dispersing to the pub! How windy... the wind sock was tangled twice and blew off the pole once The Yeti needed over 1/2 throttle just to stay still and I have discovered my lipo dies on prolonged full throttle...not bad for 3 years I suppose. PS... honest it is red really
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Full throttle from start to finish of the dive (about 45 degrees angle). The revs didn't drop off much and it recovered after shutting the throttle (but buy then it had slowed and was no longer in a dive). It was a bit like running it on the rich side of optimum (just where the max revs drop off a bit, but does not affect general running). Or its just me!
