Lucas Hofman
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Everything posted by Lucas Hofman
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Chris's Bella Ballerina HD
Lucas Hofman replied to McG 6969's topic in The 2016 Ballerina Mass Build
For those who, like me, never have read any of Peter's aeronuttycal stories one can be found at http://www.outerzone.co.uk/planfile_supplement/6447/article_6447_UK_article.pdf. Happy modeling! -
Thanks kc, I would love too. But I have to be in the office in Oslo friday morning again. However, if the wood survives Heathrow and Oslo airport luggage handling I can start building in the weekend!
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No I am not. The balsa has been mailed to our office in Weybridge. By the way that office is on the old Brookland racetrack and airfield, so we are nextdoor to the museum. I often go there for lunch and then loose myself for an hour between old planes and parts thereof.
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Not too bad. About -5C. Worse is the flight controller was malfunctioning. But then that gave me time to read up on all blogs
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On my way to the UK to, among other duties, collect the balsa ordered from the Balsa Cabin. Cross fingers it will survive the transport back.
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On gliders is is very common to use tape. I have used 3M crystal clear. Has functioned well for over 2 years now.
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Ballerina sans Tutu!
Lucas Hofman replied to Biggles' Elder Brother - Moderator's topic in The 2016 Ballerina Mass Build
Thanks BEB, i should have doen this calculation before cutting à big hole in F1! However, ESC and battery do benefit from cooling, at least in summer. As a reconciliation for those doing build up tails: less weight at the end, or more around the CG is never bad for flying characteristics. -
Nice work so far AVC. Your build up tail has all wood fiber in the correct direction and will be stronger. It addition it will never warp, which a solid one may do. With regard to paper tubes: Not many ARF do have them, but usually a piece of string is "build in". One pulls the aileron extension lead with the string. And yes, I have missed the string sometimes but a piece of wire with a small 180 bend has always done the job for me so far.
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HiAVC, it is a gram here and a gram there. I am not sure it will make much of a difference and will definetly make for more work. But heck, if one only wants to fly an ARF is the way to go (and I have a few of those too...). I reckon if I think wrong and propose something silly with these small modifications someone on this forum will say so.
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KC, I intend to have a ply mounting plate on 4 M4 threaded rods. The rods do not have to be in a square pattern, there by allowing for a little more space for the battery. The motor mounting will then be bolted onto the mounting plate. THis way I get flexibility with regard to the motor used. (the mounting plate can be drilled after the whole fuselage is done. Most likely I will fly first without a cowl to find the best thrust line. My experience with pattern planes does indicate that playing with side and up/down thrust will make a plane fly straigther. Part of the fun to get the best out of every airframe! As an illustration my Skywalker, that uses the same construction:
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Started on cutting formers: I have ply and light ply, but will have to wait for the package from Balsa Cabin for the Balsa parts. It looks to me that the lines for the snakes do not conform to Peter's prototype (assuming that the snake for the elevator exits further away from the tail comared to the rudder snake). They do not fit with the holes on the formers either. Could it be that the lines are mirrored? Edited By Lucas Hofman on 01/01/2016 21:10:18
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Scrutinizing plans - even those you will never build - is a joy for those who not only like the result but also what is under the covering. Discovering that a designer has a unususal approarch to something, enjoying particulary good flowing lines, sometimes finding silly stress concentrations og useless weight. It is a paper and visualising experience, and for me very much part of the hobby. The joy (for me) of a mass build is that one can lift this experience to include others. Many people looking and thinking about the same design to ask questions too and discuss with. And having the designer "on-line" is a seldom enjoyed privilige in this process! I wish everyone a good build, enjoyable interactions with others here on the forumand many happy landings afterwards. Cheers, Lucas
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You are right AVC, in the cross section the spar and the sheet on top of it are not separated by a line: but as Peter said, it would not make sense not have the lower rear spar running over the whole span.
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With the risk that some evil minded people are going to nickname this one the anorectic ballerina: Lightening holes in all formers, and a hole in F1 big enough to slide the battery forward in the cowl if needed (the latter will also allow air in to cool the battery).
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I have a SK3 4240 620kv in another plane which drew much less current then motocalc predicted. When measuring the rpm it was running much slower than it should. It ran as if it was a .... 520kv motor, which is another variant you can buy. Apperently mislabeled in the factory. Has any of you checked the 740kv motor by measuring V,A and rpm to check whether this really is a 740kv? if so, what where the numbers and what propeller did you use?
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Balsa ordered from the Balsa Cabin. Extremely pleasant lady handling the order. Recommended!
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Peter, in the article you write same aileron deflection up and down (no differential). However, studying the plan i see the following: It looks like the horn is quite a bit after the hinge line. Are you compensating this at the servo end, or do you actually have some differential build in?
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With the risk of incurring the wrath of BEB (although I seem to remember it was he who wrote that studying the plans is ok) another post showing more plan studying: Removing weight up front will not help if the tail is not lightened too: and In additition I will try to use balsa for the turtledeck stringers. Will it help enough? Time will tell.
