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110" TIMBER Assembly Thread
forgot pic- john Derstine
- Post #927
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
This has become an expensive project, only because I'm restarting my RC career after 20 years, have to buy everything, tools, supplies and not the least a radio. decided on a JR system from a dealer in Singapore as they come recommended and are kinda close. Now I have shopped all over for JR...- john Derstine
- Post #926
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
One thing I did last week was to cut the covering on the wing and reinforced the strut attachment with balsa stock and Hysol mixed with chopped fiberglass for strength. I used some more beer can aluminum to cover the holes, I really don't drink much beer, it was the same can I used for the...- john Derstine
- Post #925
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
Not doing much the last week, still waiting on servos, a long sad story but some will be here next week. Good news is my Booma R/C order arrived so I thought I'd share some of the nice stuff they sent, minus the most important thing I ordered from them, the ultra switch dual battery backup...- john Derstine
- Post #924
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
3 pics are worth 1,000 words :) coil the aluminum strip around the bolt, remove, hold it in your fingers, tighten it so it becomes compressed insert in the 10mm hole in gear (plus in my case the strap), let it uncoil, insert bolt and tighten, helps to leave it slightly proud so it is forced to...- john Derstine
- Post #922
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
- john Derstine
- Post #920
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
What I ended up doing to mount the airtop wheels: first I found the missing hub bolt laying on the floor apparently slipped out of the little zip lock bag and was floating around in the main bag, then fell on the floor. I decided to use stainless steel axels instead of grade 8.8 as the 8.8s were...- john Derstine
- Post #919
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
Wheels today, at the risk of being redundant, I'll add a little update to the Airtop situation. As of today I think Airtops will be the only alternative bush wheel solution, PMT's are not available for 3-4 months as of this date. PR's are non existent. Anyway my Airtop 180mm wheels arrived...- john Derstine
- Post #918
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
I was a little concerned about that, but the force applied is not exactly a shear force or a tensile force, so hard to calculate, Shear is about 60% of Tensile, but should be good for 800-1500 pounds (maybe). I'm counting on the up coming inflatable tires to take some load, it's an experiment...- john Derstine
- Post #917
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
My take on landing gear reinforcement. Cheap easy and effective using scrap ordinary aluminum to make two tension straps. Added almost no weight and made the gear as stiff as if I had made a new gear from 1/4" 6061 T6. Happy with the result. wheels are in customs for three days arghh.- john Derstine
- Post #914
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
Went ahead and added the larger T-nuts. I wanted 4mm but could only find 5mm. OK if you use the metal strap between the struts, I would not use 5mm un reinforced as it actually weakens the wood as it is so close to the margin of the ply. easy job. ripped off the barbs epoxied them in with hysol...- john Derstine
- Post #913
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
Interesting to note you need the extra weight of a flight pack for balancing, negates the reasoning for using a separate BEC. still may go gas, have not pulled the trigger either way.- john Derstine
- Post #912
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
That's a good point, I did not, but I was just looking at it this morning and thinking 3mm bolts and blind nuts here look pretty wimpy. With the aluminum strap the forces no longer transfer to the Tnuts but each strut to the other, the hole is tight no slop, but it sure wouldn't hurt to pop out...- john Derstine
- Post #911
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
I have not purchased an ESC yet, I'm looking at the Castle Creations Talon HV120amp with BEC included, or the Hobbywing FLYFUN 130A HV OPTO V5 ESC and stand alone Hobbywing UBEC 25A HV 3-18S Module 25A with multiple possible outputs for sharing the load and since I may use 2 rxs this will serve...- john Derstine
- Post #908
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
Today I will attempt to contribute something instead of just asking questions. While i'm waiting for servos, I decided there engineer a few things, Tail wheel for one, more on that another time. This first job was to address what looked like a weak point in the strut installation. I decided to...- john Derstine
- Post #905
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
I would think whether you can efficiently use a 20x10 vs. a 22x10 would depend in part on whether your using 10 cells or 12. a 20x 10 on 12 cells seems right from what I've researched on similar motor specs ( and the recommendations in the XPWR 40 manual which state a max prop size of 22/10 is...- john Derstine
- Post #903
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
I looked at this motor but getting one shipped to me is hard, based on your results I'll reinvestigate sources. looks to be the perfect size for e power as the motors I have been able to source are either overkill or not quite powerful enough for the kind of flying I envision. Thanks. Edit...- john Derstine
- Post #901
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
Thanks for the tips. Yes 4500 WATTS supposed to be... I'm curious as to which motor you are using so I can get some comparative specs, problem is some manufacturers don't publish detailed specs for their motors. I understand KV and watts/ volts/ Amps. But all the more esoteric numbers I am not...- john Derstine
- Post #899
- Forum: Giant / Scale ARF Build Threads
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110" TIMBER Assembly Thread
Well. thought I'd better post something about my Timber build, nothing much to report as I am waiting for servos to arrive and almost everything else. I had to import even epoxy and CA as there are no local suppliers here in the Philippines. Managed to get all the servo horns glued in, rudder...- john Derstine
- Post #896
- Forum: Giant / Scale ARF Build Threads