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I haven't done, but I can take some figures in a vertical descent (with & without the brakes deployed) from a GPS derived speed using 'Flight Coach'. I'll see if I can do that tomorrow & get back to you....

@@ModelPlaneTraining I would like to see if a roll occurs. Because I think it must be very difficult for the braking effect to be the same on both sides. It's ok using Flight Coach.

There is no roll, as each aileron deflect a balanced amount. It does take some time to get the control linkages set up exactly, but is actually easy to do. I thought you were thinking about how the descent rate would change with/without flight coach? I can only add words/figures to the comments & not a pictures of F.C. trace in the descent..

Realflight 8.5. The Sbach has been modified with changes to CofG & control throws etc to make it fly a little better..

@@russbowey thanks a lot, the vids are very helpful.

@@icstreeservices9820 That's great to hear! 😁

Hi Adam, Yes all the models only have 1 degree of differential, however they only have about 8 degrees of movement at full deflection & I tend to roll fairly slowly (the faster you roll the more 'roll induced' adverse yaw you will get). The important bit is to test fly the model, get everything set up & see what (if any, or how much) aileron differetial you need to help get those axial rolls. If you haven't seen it, have a look at the trimming guide on my website & you will see how to test fly the model to establish what you need to help the model fly better (aileron diff is on page 3 of the airborne checks, but you do need to the ground checks & then work through the airborne checks in order of course!). Here's a link to the guide if it helps: modelplanetraining.co.uk/trimming-guide/

@@ModelPlaneTraining Thank you for clarifying, and I will be taking a closer look at your website. Thanks again for this great content!

(I’m glad the examiners apparently call out the next manoeuvre on B -Test).

I'm not aware of anything that would work (the timing would change depending on the windspeed & how you're flying on any particular day.. Perhaps just keep doing what you can remember & then gradually add another manoeuvre until you've got the whole sequence (this is where a SIM does come in handy)... You can of course ask a helper (or even the examiner!) to call the manoeuvres on a B test... It's a test of flying, not a memory test..

That's great to hear! ... & one is the reasons I make some videos... The literature does say in places that the transitions should be done 'neatly' & in doing so you can get a bit of a free practice (i.e. pushing up for the bunt after the loop, you get a free look at the 2nd half of that upcoming bunt)... Hope you get that 'B' test soon! Russ

Glad you like it Peter! CofG is of course a 'range' so manufacturers get away with putting it well forward as it makes the model look 'stable' ... Until you start flying proper aero's! Even dedicated aerobat's have that issue.. A quick couple of tests & a great postion is easy to sort... If you haven't seen it, take a look at my trimming guide on the website. 👍 modelplanetraining.co.uk/trimming-guide/ Russ

Hi John, Rather than looking at segments of 90 degrees, it's easier to look at what happens at any single point during a roll. The roll induces adverse yaw (to a greater or lesser extend, depending on roll rates as well as aspect ratio, wing shape etc.), if you roll to the right, the nose is inclined to drift in the opposite direction 'left', so if the model is upright, on it's side or upside down (it only sees airflow & not gravity) continuing the 'right' roll, the nose will continue to drift in the oposite directioin 'left', so in the latter stages of the roll say from inverted to back upright, as the model continues to roll right the nose drifts left - or down towards the earth in this case, so if this is significant, adding aileron differential will help counteract this tendencny.. (it's not ALWAYS the case, when I fly F3A P & F schedules the model is rolling so slowly, the effect is negligible) For a more detailed look at this, have a look at the 'Flying Better Rolls' vid & see if that helps to make more sense. ua-cam.com/video/OyHEZXfHWVc/v-deo.html Hope that helps? Russ

Hi Russ Thank you very much for your prompt reply. I found your ‘Flying better rolls’ video excellent. I use the method you describe to get the CG near neutral and it has helped greatly with my rolls and inverted flying. I can appreciate that the factors you mention affect the strength of the adverse yaw, and particularly that with slow rolls the effect will be negligible. I have thought a lot about what you say in your reply and think there is a snag. The lift on the wing is always in an upwards direction opposite to the gravitational force on the model. As the model approaches knife edge the lift on the wings (and the forward and aft components) diminishes to zero. It then reverses (relative to the wings) as it starts to develop lift in the opposite direction to support the model when it is inverted. When the model is inverted the starboard wing (now on the left side of the model looking forward) is the one moving upwards and will therefore have an aft component due to the airflow (as illustrated in your diagram). This wing has the aileron downwards with the greater deflection (as a result of differential). This produces more induced drag than if there were no differential. This increased drag on the left will increase the adverse yaw while the model is inverted. The port wing, now on the right side, will have a forward lift component and lower induced drag (due to the smaller deflection). This reduced drag on the right will increase the adverse yaw while the model is inverted. The increased drag on the left and the reduced drag on the right, as a result of differential, will produce greater adverse yaw while the model is inverted, than if no differential had been applied. I hope that my explanation is clear as to why I believe that differential will make adverse yaw worse while a model is in the inverted phase of a roll. I look forward to seeing more of your excellent videos. Not many UA-cam videos help those who are interested in F3A flying. Your use of Realflight works very well as you can see a close up of the model plus the controls. Your flying is precise and well explained too. I have subscribed to your channel. Thanks again John

@@lukesanders8258 Thanks for the great comment Luke. Glad it was useful & big CONGRATULATIONS on your successful A test! Great stuff! 😁😁

Hi Robert, I'm glad you liked the video & thank you for a very sensible question. So the basic (stock) simulator model has a CofG that is actually way too far forward. The model is therefore nose heavy. To overcome this, the model needs an up elevator input to get it to fly straight & level, to get the model to do this hands-off a significant amount of rear (up) trim is used. When the CofG is moved to a place so that the model wouldn't be nose heavy (quite a long way aft in this case), if nothing was done with the elevator trim, the next time the model flew it would simply want to keep on pitching up - due to that previously inputted up trim. Therefore the transmitter elevator trim was beeped forward (quite a lot), to a position that I knew would be about correct. How much you would need to adjust the trim will depend on each individual model & of course how much you move the CofG around. I hope this all helps, ask again if not! Russ

@@ModelPlaneTraining Hello Russ. Thank you for your prompt and comprehensive reply... and yes, I now fully understand. Thank you again. Robert

Well I fly the Advanced schedule with a 1.5m Sebart Miss Ultimate (Electric 6S setup), won the Nats Advanced with it last year & the first comp entered this year... Lots of people fly BIG (100-200cc planes up to 3+m), but they are NOT a requirement. Basically, find a model the you will enjoy flying looking at & flying & go from there. I'd say that 6 channel is a sensible minimum, as it allows you to play with aileron differential & virtual wing incidences etc. Getting a well sorted model will help if you enter comps & have to cope with different wind conditions & perhaps a few nerves at the same time. For more info on all that sort of thing, see the trimming guide on my website: modelplanetraining.co.uk/trimming-guide/

@@ModelPlaneTraining , I really appreciate the reply and advice. Exactly what I was looking for.

Did you look at the whole of the download? 1st page 'A' is a description & a scoresheet. 2nd page 'B' is the sequence flown with a wind from the right (which is what I think you're looking at. 3rd page 'C' is the sequene flown with a wind from the left - As flown on the demo video. In case you downloaded anyting else, here's a link to the origin: www.mini-iac.org/downloads/sequences/2024-knowns/download?path=2024%2BBasic%2BKnown%2BSequence.pdf

@@ModelPlaneTraining Lol, no I didn't. It looked like a single page on my screen! I'll check it again when I get back home. Thanks!

@@ModelPlaneTraining Heh, there were two pages, and I just realized that there is a wind direction marker plainly visible in the upper right corner... I'm an idiot, lol! Thanks!

Yes I fly a variety of biplanes & of course with all the effects, they all require some form of compenation (even the F3A ones!). Glad you found it worthwhile & hope you will enjoy some more videos coming up soon! 😀

All practice is good practice Wayne. Hope you continue to enjoy the variety that IMAC adds to your freestyle flying! 👍

Yes there is always more than one way! I flew a Phase 6 slope soarer for about 10 years in the '80s, normally off a hill with great lift (U.K. South Downs), so bank & yank was great for our impromptu pylon races, but when doing aerobatics - the 4 point hesitation roll was definitly better with rudder! Particularly the 3rd part... I also flew the model near my parents house with very poor lift (small hill where I started slope soaring with a single channel Veron Impala in the early '70s!), here the use of rudder for efficient coordinated turns was the best way to keep the model airborne.. Horses for courses! :)

Thats really great to hear Matt! I'll be interested to hear how you get on in the real world too! Well done for giving it a go & hopefully you'll keep on enjoy IMAC &more precise flying too! :)

Hi I replaced it with an upated one. The original had the 2nd roll on the teardrop flown too ealy... The replacement is here: ua-cam.com/video/j98i1hWppkw/v-deo.html Please feel free to subscribe to get notifications of any updates etc. Thanks

Thank you! 👍