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Member postings for Chris Walby

Here is a list of all the postings Chris Walby has made in our forums. Click on a thread name to jump to the thread.

Thread: seagull wing bolt size
24/06/2019 22:11:06

Hi, I tried steel set setscrews on my IC powered twin and they never stopped undoing! Sorted once I epoxied washers in the cheese head screws and fixed with a cable tie.

Then found if I cut the original plastic screws down to length so I only need to screw in enough to fill the nut, the job was easier enough.

PS Hex head cap head screws and a hex ball driver could be another option

Hope that helps!

Thread: Cambrian / Cambria Funfighter-----which to choose!
24/06/2019 16:28:09

Spec on mine is

Recommended 3536 1500-1000KV, actual 1800KV from HK, on a 9 x 6 prop, 46A, 488W, so power to weigh is 488W/1.280Kg = 381W/Kg

However it is an aerodynamic brick so flies much slower than models with far less power to weight and are more aerodynamic. wink

PS its a bit of a handful to hand launch with such a poky motor so best at 2/3 throttle and count 3 so the motor is not accelerating.

24/06/2019 12:05:44

I went for a Cambrian as I didn't know of the others (sorry and they are local to me! could have saved the P&P).

Nice kit of bits, instructions had a few extras/missing bits but not an issue and went together easily.


Now here's my problem (mine) I wanted something fast, hence it high visibility colour scheme. I have totally maxed out my 1700KV 48A power train and it is not that fast....If you want fast try an EFXtra!

Good news is it flies very nicely, is tough as old boots and eats a lipo in under 4 minutes at full throttle.

Not so sure how much "fun" it will be in windy conditions

Next time I will go for the "other" manufacture (thinner wing section & local).

Thread: Laser Engines - Technical questions
22/06/2019 07:04:04

Martin, I can't really speak from experience, but picking up info from the SG Hurricane thread and Jon's comments I was not expecting mine (Hurricane) to be anything but throttle/pitch sensitive. I am sure Jon advised me to trim at around 1/2 throttle for level flight and use the elevator for other settings.

I appreciate if its really bad it might need adjusting. Good luck wit the Spit and let us know how you get on

Thread: RCM&E Fly-In 2019 - general chatter
21/06/2019 10:34:43

A - Better pull finger out and finish my renaissance

B - Book a camping spot

Flew there a couple of years ago and it was a great day (thanks pylon guys for puting up with the slowest model!)

No pressure...could do your A on the day....with your Renaissance ! cheeky

Thread: Good news thread.
21/06/2019 10:04:05

Placed order with 4-max, George let me know there was a delay with some parts by email.

Emailed and then phoned to find George was under the weather with a cold, but said their supplied had just delivered and would dispatch.

Parcel arrived with full parts ordered by 9:30 today and I only spoke to George yesterday !

Should have a enough Lipos to fly 4 Nutballs 6 times in an hour (pilots permitting!) - The Scouts will be pleased!

Nice weather...days holiday....just got to head off to the field!

Thread: Laser Engines - Technical questions
13/06/2019 06:46:23

Now that looks a nice model and I am sure with the 180 in it the will sound just great...please please build thread wink

12/06/2019 22:51:51

...most important question...what's it going in...?

Thread: Seagull Mosquito Laser build
10/06/2019 12:46:06

Jon, If you don't have a pair of 70's you could drop the lead/tail wheel lump and squeeze a pair of 80's in. The bulkheads have to be moved back anyway, so it would only be the tanks needing a bit of a tweak. Don't get me wrong the 70's are more than okay, just best if kept 3/4 to full throttle to keep her hustling along.

Don't forget there's a try before you buy offer from me just in case your on the fence....wink (Free with any hurrie maiden).

10/06/2019 09:59:20

Once I found out what I had done with the mixes in my TX and got rid of the throttle cut feature that was screwing things up (could not inhibit the knob on DX8g1) I decided to leave it as it is.

I'll need to take the cowls off and while I am doing that I change the linkage to adjustable clevis set up. Winter project!

I think I'll try Jon's suggestion of setting it up with WOT at 100% servo travel, then sub trim at shut is good advice (not that other is wrong) as I am a bit nervous of putting anything solid down the carb inlet and closing the barrel against it. Not an issue with a gentle finger, but if I forget/mess up and drive a servo against it, it may do it some harm.

PS the twin set up is super easy on my DX8g2 (with no mixes) + they are running in sync now so not an issue. Just spending more time fixing the U/C, but that's mu fault!

10/06/2019 07:47:44

Sorted the TX out and have since found a much more elegant way of doing the mix, but that's for another day.

Yesterday was all about having some real fun (although still getting used to this war bird) with the wide sweeping low pass. Climb out and perhaps a cheeky slow roll.

Tried a big loop and just kept the power on until well over the top with no issues.

"Black Rufe" on a low pass (credit to Dave for the photo)


Landing was pants, but that's just me as it sent the warning message out and I just backed off the throttles too quick, caught out by something that lands short ever weighing this much wink

Once again thanks to all that have given advice over the build and flight.

Thread: RPM Conundrum
09/06/2019 21:53:46

My vote is with Trevor,

Example, I use standard, nanotech, and Graphene lipo and the battery voltage at full throttle drops less wit the Graphene hence the motor turns faster and absorbs more power.

As Scotty would say "You cannot change the laws of physics" and at least some of the additional consumed power should be turned into more speed.

On a different tack, if you wanted to bend the rules then reducing the models drag would probably produce a greater climb rate... especially if the model lost some weight...

The new lightweight gilder depending on the event might not work as well as its heavier brother...swings and roundabouts!

Thread: Electric Motor 'clunk' When Opening Throttle
04/06/2019 19:08:21

Off topic, sorry. Thanks TR, I thought as much...just can't find the time to take to swap the ESC's over...better get back to the mass build or should I pop my Laser 80 in it wink

04/06/2019 16:44:32

From stationary you are asking the ESC to accelerate the motor shaft very quickly and it might just be a feature of that type of motor where it produces a "clunk" as it starts. Same sort of thing when its wind milling as you are asking the ESC to catch the motor shaft on the fly and accelerate it.

I have a motor/ESC combination that really does not like that if the throttle is picked up too quick and makes a right squeal.

Only other issue was a motor that would once in a while do a 1/4 back turn before rotating as normal...found the problem on the maiden at WOT when the manufacturers motor connector failed and dead stick on me. Not nice as it was a war bird twin at lowish level!

As previous post could just live with it or change the motor and or ESC out.

Thread: The Difference a Prop (Pitch) Makes?
02/06/2019 06:43:10

IMHO, coarser prop gives higher top speed, but is less efficient at very low speeds + becomes "grabby". If you have a model with a high pitch its harder to control low speed flight (when landing).

12x6 and 12x8 are not that different, try a 10x10 and 14x4, that should be noticeable!.

PS if you don't need the speed (or keep the noise down for ic) go with the finer George recommended wink

Thread: Daks Over Normandy
31/05/2019 09:08:41

Not sure how you find the route, but air space notifications look like this.

dak route.jpg

For the 5th so is this the route they will fly out to Caens?

31/05/2019 08:48:06

Will -0 the link does not work for me....and I don't think they are coming back for a few days...

Denis - which one of the DC3's/C47's has the transponder...or do all 35 have one each?

Can't miss this many Daks in one place, wink

Edited By Chris Walby on 31/05/2019 08:49:09

Thread: Seagull Mosquito Laser build
27/05/2019 09:18:06

Thanks Cymaz, I warm each one up individually and set the main needle WOT, then run both up and check they are in sync.

My problem is that I have each servo on a separate channel with a couple of mixes in to get throttle and throttle cut to work, Somewhere in there I have messed it up and the Aux channel does not follow the throttle for the initial 0 to 35% although it catches up by 40%. Adds to the excitement of taking off and I didn't think it would make much difference in flight...I hadn't anticipated doing an inverted stall test (top of loop!). I'll do what Jon suggested (teach me!) and set them on a single channel and spend more time mechanically setting them up. Live and learn.


What I need is a simple and elegant solution that results in a clevis so I can tweak it by 1/2 turn to get them spot on.

PS I like your idea of a pin to set the throttles at the same place and that might get me close enough.

27/05/2019 06:22:44

Thanks again for everyone's input, I think I'll go for a combination of too slow over the top (tip stall) made worse by the engine imbalance at low throttle setting and a dob of cross wind as well.

The numpty on the sticks will have hopefully learnt his lesson which leaves some advice for the mechanical modification to do.

throttle servo linkage.jpg

The current arrangement is quite thin wire and barrel on the end of the servo arm. What I would like is a clevis, but I am not sure the best way of fixing the small diameter wire to a threaded stud for the clevis.

Idea's anyone please

I'll take some better photos and post

PS its the servo on the right behind the wires wrapped around the oleo (removed before flight!)


Edited By Chris Walby on 27/05/2019 06:25:51

26/05/2019 07:00:39

Thanks guys for all of the helpful advice and I agree with your analysis.

In preparation to flying the Laser Mosquito (my much needed experience of running glow and flying twins) I build the pair of 70's into a SG Dual Ace. Jon's advice has been very helpful throughout the entire process, but especially with twins and the general concept of always having a plan B in case something goes pear shaped. With that I mind practiced on the simulator with various engine cut scenarios.

Just as well as my electric BH Mossie suffered a loss of a motor on a low fast pass and survived by more luck and me not doing the wrong thing!

JD 8 I have not seen the RR299 footage for quite some time, but the way mine rolled in is very similar, just I had a lot more height on my side. My passion is for the wooden wonder and there are some interesting comments from Mosquito pilots about its flying characteristics, but equally its sting if things don't go well. There were quite a few losses on take off if one engine lost power. The additional drag of the prop and low air speed combined with the urge to apply more power from the good engine would end in disaster.

A reminder to me that it is not the Dual Ace by a very long way and that the greatest enjoyment often needs a proportional amount of effort from me (and respect!).

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