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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Drilling the blade root
01-21-2020 03:24 AM  28 days ago
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SkySurfer

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Drilling the blade root
I’m about to order a head that has 5mm blade bolts, but most blades are 4mm. Has anyone ever drilled there blade roots to accept a bigger bolt? If so how do you center the drill to do it perfectly? Not saying I’m doing it, but I’m curious.
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01-21-2020 06:21 AM  28 days ago
wjvail

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I don't recall ever having to open up a blade bolt hole. In many blades I've bought the blade hole was over-sized and a brass bushing was used to reduce the size of the hole as needed. So, no, I have not drilled out a blade.

But to your question, I wouldn't hesitate to simply run a drill though the hole. I'd be inclined to use a drill press and a sharp bit but even that probably isn't necessary.
"Well, nothing bad can happen now."
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01-21-2020 02:54 PM  28 days ago
oldfart

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Many blades come with 5mm bolt holes and bushing inserts that step it down to 4mm. You can cut up these inserts to the thickness of each tongue of the blade grips to step them down to 4mm and use 4mm blade bolts.Phil
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01-21-2020 04:47 PM  28 days ago
SkySurfer

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Ok, I found a set of scale blades that have a 5mm hole with a 4mm brass insert. Can I press out the brass insert and run them with out the insert? Other wise I have to go with Vario’s blades that are 865mm 5 blade.
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01-21-2020 04:53 PM  28 days ago
Rojoalfa

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SkySurfer Can I press out the brass insert and run them with out the insert?
/
/

Correct.

No problem.

/
Saludos cordiales,
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01-21-2020 04:59 PM  28 days ago
wjvail

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SkySurfer Ok, I found a set of scale blades that have a 5mm hole with a 4mm brass insert. Can I press out the brass insert and run them with out the insert? Other wise I have to go with Vario’s blades that are 865mm 5 blade.
Unless there is something very special about the particular blades you are considering, you certainly can tap out the bushing. In fact, I wouldn't be surprised if the blades came with the bushing not installed and it would be up to you to install them.

As a side note... I can't recommend any setup that runs 865mm blades and includes 4mm bolts. Those are really big blades and I personally would consider 4mm undersized. Standard 690-720 blades run 5mm bolts.
"Well, nothing bad can happen now."
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01-21-2020 05:23 PM  28 days ago
SkySurfer

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This is a dumb question as I know the answer. But what’s the odds ordering 3 packs of blades and having them weigh perfectly?
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01-21-2020 06:18 PM  28 days ago
wjvail

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SkySurfer This is a dumb question as I know the answer. But what’s the odds ordering 3 packs of blades and having them weigh perfectly?
How big is your heli?!?!? 6, 850mm blades?

Kidding aside... Depends on what you're asking...

What I've seen is that sets of blades are nearly perfectly balanced from the factory but actual weight varies from set to set. So unless there is something special about the blades you are considering, I'd say there is little to no chance 3 packs of blades will have the same weight. Almost certainly you will be able to use each pair of blades without modification but the pairs will vary in weight from set to set. Clear as mud?
"Well, nothing bad can happen now."
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01-21-2020 06:55 PM  28 days ago
SkySurfer

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wjvail How big is your heli?!?!? 6, 850mm blades?

Kidding aside... Depends on what you're asking...

What I've seen is that sets of blades are nearly perfectly balanced from the factory but actual weight varies from set to set. So unless there is something special about the blades you are considering, I'd say there is little to no chance 3 packs of blades will have the same weight. Almost certainly you will be able to use each pair of blades without modification but the pairs will vary in weight from set to set. Clear as mud?
It’s a Vario Md 520n 1/5 scale going to be 5 blade. I flew it last year on 4 5000 6s packs around 10:30-1100minutes. I didn’t like the 2 bolt head and it was a four blade. Also I hated charging 4 batteries. So this year I’m converting it to fly on 3 batteries and I’m redoing the Nortar system to run just as fast as it needs to run, saving energy. I’m hoping for 7:30-800 minutes. I was looking for a way to avoid buying Vario’s 5 blades 865mm $580. It flew just fine on 4 765mm blades. The heli is a beast and will probably be 8 1/2 feet long with blades.

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01-21-2020 08:33 PM  27 days ago
Grimracer

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Eau Claire WI

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Something to ponder.. with the two bolt blade/grips.. the blade cannot rotate out and cause a boom strike..

If it was be building that beast I would be wanting the 2 bolt system!

Never the less it has to work for you!

Grim
Michael J Zaborowski
Futaba USA
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01-21-2020 09:25 PM  27 days ago
wjvail

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I should have mentioned this in my last post, but just because 3 pairs of blades probably won't match, it isn't difficult to adjust their weight so they do. I personally wouldn't hesitate to buy three sets of blades and spend an hour or two with a Roto-Pro matching them."Well, nothing bad can happen now."
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01-21-2020 09:34 PM  27 days ago
SkySurfer

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Grimracer Something to ponder.. with the two bolt blade/grips.. the blade cannot rotate out and cause a boom strike..

If it was be building that beast I would be wanting the 2 bolt system
For sure that’s a big pro to consider. But the cons for me were, set up time, transportation, blade fitment,hard to get in sometimes, and the danger of a blade strike even at spool down, there’s no give. I got a few weeks till I pull the trigger, but maybe I’ll reconsider.
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01-21-2020 11:54 PM  27 days ago
Notar

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This heli is set up as a right hand rotation machine?
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01-22-2020 12:32 AM  27 days ago
SkySurfer

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Yes, I couldn’t get the one way out for the life of me. If I want to go left hand, it would be real easy. Just need a press.
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01-22-2020 12:55 AM  27 days ago
Notar

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I dont believe Vario makes those blades for RHR. Only LHR for the 5 blade head. Unless you order metal.
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01-22-2020 01:09 AM  27 days ago
SkySurfer

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https://www.vario-helicopter.biz/us...00::102697.html

Made for the 1/5 hughs 500 same size as the 520.
Right or left rotation. I was looking at the Goblin mechanics and I have a extra pulley with auto bearing, it looks like I’ll trash the bearings to get access to the one way. But now would be the time to change over, to left hand. But then again I don’t have plans entering it in any shows.
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01-22-2020 01:28 AM  27 days ago
Notar

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Thats a large disc for that machine.
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01-22-2020 01:37 AM  27 days ago
SkySurfer

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Notar Thats a large disc for that machine
That’s what I’m thinking too. She flys nice with 765mm. I’m also looking at some 750mm from scale flying.
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01-22-2020 01:48 AM  27 days ago
SkySurfer

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The manual calls for 875mm blades, but that’s a 2 blade head.
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01-22-2020 07:42 AM  27 days ago
hpearce

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I have a bergen twin EB, from memory the blades are 890mm and the bolts are 4mm. They seem to hold up fine even at around 20kg takeoff weight! I’m sure that 4mm will be fine, but in saying that I would be happier with 5mm
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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › Drilling the blade root
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