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Whippish

A ripoff of a Rich Harris Whippit

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Outrunner22/02/2020 18:12:40
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81 forum posts
23 photos

Hello. After reading the Whippiteer thread I was enthused to have another go at getting the hang of flying an autogyro. It might be a while before the Whippiteer plan is publish so I've decided to build a Whippit, Rich pointed to the RC Flyer magazine from August 2014 that has the free pullout plan of the Whippit which I already have tucked away.

I thought I also had tucked away some EPP foam but this turned out to be 6mm depron. Hmm. So I decided to build a model based on the Whippit using a liteply frame with depron skinning keeping all the dimensions the same.

Not being a true Whippit I'm calling it Whippish being a ripoff of a Whippit, I hope you don't mind Rich smiley

If there is any interest I will post some photos of (slow) progress and hopefully I can try to fly my Whippish this spring when the flying field has dried out.

Phil.

Richard Harris22/02/2020 22:58:25
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2150 forum posts
1998 photos

Phil,

Sounds great smile d, looking forward to your build log thumbs up

Rich

Outrunner23/02/2020 09:36:33
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81 forum posts
23 photos

Rich

Thank you for your approval! Iv'e made a start and I will try to post regular updates and hopefully some flying shots!

I scanned bits of the plan as a PDF and enlarged by 143% and printed out the formers full size (the plan with RC Flyer was reduced to 70% full size). This photo shows the underside former extended the full length of the fuselage as I using 6mm Depron and not 9mm EPP. The cut out for the battery pack was extended to take up to a 2200ma pack if need and the cutout for the rudder servo moved back. Must get a new cutting mat!

whippish fuselage 1.jpg

Outrunner23/02/2020 09:41:33
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81 forum posts
23 photos

Fuslage crutch now cutout and building can commence. I'm making it up as I go along so I can't cut all of the peices out yet but I'm sticking to Rich's overall dimensions and angles if that makes sense.

whippish fuselage 2.jpg

Outrunner23/02/2020 09:44:23
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81 forum posts
23 photos

First of 3 firewall formers, I will add the other two later. Battery box and mast holder built. Rotor mast drops in. Sorry about the mess! Ready to start filling in the gaps with Depron.

whippish fuselage 3.jpg

whippish fuselage 4.jpg

Edit. Added photo,

Edited By Outrunner on 23/02/2020 09:46:40

Denis Watkins23/02/2020 09:56:16
4334 forum posts
104 photos

That is not a mess, but just modelling activity

Watching with interest as have never built one of these

But have seen a young man fly one, low level, like a scene

from " Mash "

Edited By Denis Watkins on 23/02/2020 09:59:16

Outrunner23/02/2020 10:06:03
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81 forum posts
23 photos

Denis, I have flown an autogyro, very briefly a few times before the crashes! I have a Rotorshape that I was going to try and fly again but I can't find the rotorblades indecision so I decided to build a Rich Harris Whippit, or something like it anyway.

Phil.

Richard Harris23/02/2020 10:55:01
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2150 forum posts
1998 photos

Agree with Denis, its all WIP, certainly not messy as you can still see it!

I like to see these builds by folk as you always see better ways of doing things, one such is your battery box that runs to the bulkhead. I will borrow that idea if you dont mind?

You'd be surprised at just how many Whippit inspired autogyros people have come up with over the years, some fine examples, I must get an album together of their efforts if there is interest?

If this rain holds off I'm off up the field later with mine as I am going to try shorter blades smiley looking forward to more build photos smile d

Rich

Outrunner23/02/2020 12:06:16
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81 forum posts
23 photos

Sure Rich, no problem using the battery box onto the bulkhead idea, after all I've copied your ideas!

It will be very interesting to see an album of Whippit inspired autgyros please carry on.

I will post some more photos later.

Phil.

Bob Bertram23/02/2020 14:08:33
295 forum posts
27 photos

Phil, your workspace is positively tidy compared to mine. Watching your build with interest. My Whippit has been through the wars somewhat!

Bob

Outrunner28/02/2020 16:09:48
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81 forum posts
23 photos

Been doing some more work on my Whippish.... Starting to fill in the gaps with layer of Depronwhippish fuselage 5.jpg

Holes for servo's and cableswhippish fuselage 6.jpgFollowed by more Depron

whippish fuselage 7.jpg

Outrunner28/02/2020 16:12:10
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81 forum posts
23 photos

Weight check

whippish fuselage 8.jpg

Not sure if that's good?

whippish fuselage 9.jpgTail pieces tried for size

Outrunner28/02/2020 16:13:53
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81 forum posts
23 photos

Got these bits from Coolwind. Very nicely made and good value for money.

Not sure what the round bit is for?

coolwind c30 razor rotor head and delta plate.jpg

Outrunner28/02/2020 16:18:21
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81 forum posts
23 photos

Fitted an Airtek 2836/1120 outrunner. Should produce about 280 Watts.

whippish fuselage  10.jpg

Outrunner29/02/2020 15:45:16
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81 forum posts
23 photos

Rich. I've scaled up the rotor blade dimensions from the RC Flyer plan and it gives me a rotor blade size of about 61mm by 400mm. Is this correct.

I've got some 1/4" X 3/8" spruce and cut some 1/4" X 2" balsa to make up the blade but looks huge. Is this right?

Many thanks. Phil.

img_20200229_152237.jpg

Edited By Outrunner on 29/02/2020 15:46:02

Richard Harris01/03/2020 19:32:14
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2150 forum posts
1998 photos

Phil,

Looking good!

Your not far off at that, just put the rule across my blades that I use on the depron 'type 2'

440mm long, 60mm cord, 6mm thick, mounting hole is 420mm from tip inwards.

Rich

Outrunner01/03/2020 19:58:39
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81 forum posts
23 photos

Rich

After gluing the blades together and trimming the ends they are 415 long by 60 wide, is this too short?'

I'm working on the blade profile at the moment.

I will post some photo's later.

Phil.

Outrunner01/03/2020 20:59:08
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81 forum posts
23 photos

I enlarged and printed the blade section then stuck this to a piece of thin ply

blade template.jpg

Then marked around template onto end of blade blank, as Rich recommended I'm making four blades

blades 1.jpg

Nice new blade in the David plane and roughed out the profile

blades 2.jpg

Roughed the leading edge

blades 3.jpg

Now the trailing edge and ready for final sanding

blades 4.jpg

I'm following Steve Jones blog within the Atom Special thread on blade making, this has been really helpful, thanks Steve smiley

Richard Harris01/03/2020 21:20:03
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2150 forum posts
1998 photos

Phil,

I find blade making quite satisfying, your shorter blade length should be ok but I can calculate the rotor disc loading once you have an idea of the AUW?

Rich

Outrunner01/03/2020 21:31:08
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81 forum posts
23 photos

Rich

I'm enjoying making the blades, it much nicer working with ply and balsa than depron. The model is now painted although it was a bit of a disaster, I will explain and post some photos later.

I can come up with a close estimate of all up weight tomorrow as I have everything to hand and I'll put all the bits on the scales.

Thanks again.

Phil.

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