B-70 Valkyrie (oz6639)
About this Plan
B-70 Valkyrie. Profile scale delta pusher model.
Quote: "A Bob Linn design. B-70 Valkyrie. A high flying model of the US Air Force's newest, fastest, highest flying airplane. The world's first true nuclear bomber. Now in production at Northern Aviation.
Dozens of these B-70's have been flown with .020 and .024 size engines, this power is adequate and the flight pattern realistic, however if desired, engines of up to .049 displacement can be used if tank is used as engine mount. Mount engine with No. 'O' x 3/8 long wood screws.
Balance the model by placing either B-B shot or split shot sinkers in ballast box. This model will glide much faster than conventional free flight models due to the delta wing configuration. Glide model over grassy area, adding or removing weight as necessary until smooth flat glide is obtained.
It might be stated at this time that if the model is balanced as shown on the plans the majority of models will be correctly trimmed. Anchor the B-B's in ballast box by squeezing glue into ballast box and allowing to dry. After the B-70 has been trimmed the ballast box opening may be filled with scrap balsa and finished off flush.
This model due to its delta wing configuration is sensitive to torque. If pusher propellor is used model will need about 1/16 of an inch left tab on both Rudders for the first flight. If model circles too tight to right increase left tab until wide right turn is obtained.
Adjustments for conventional props are as follows; place propellor on shaft in backward position and run engine backwards to get pusher effect from engine. With this set-up model will require Right Tab about 1/16 of an inch for the first flight. Good Luck. "
Direct submission to Outerzone.
Note this Bob Lynn design also appeared in April 1961 Aeromodeller, see B-70 Valkyrie (oz4257)
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
North_American_XB-70_Valkyrie | help
see Wikipedia | search Outerzone
ScaleType: This (oz6639) is a scale plan. Where possible we link scale plans to Wikipedia, using a text string called ScaleType.
If we got this right, you now have a couple of direct links (above) to 1. see the Wikipedia page, and 2. search Oz for more plans of this type. If we didn't, then see below.
ScaleType is formed from the last part of the Wikipedia page address, which here is https://en.wikipedia.org/wiki/North_American_XB-70_Valkyrie
Wikipedia page addresses may well change over time.
For more obscure types, there currently will be no Wiki page found. We tag these cases as ScaleType = NotFound. These will change over time.
Corrections? Use the correction form to tell us the new/better ScaleType link we should be using. Thanks.
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsGood Morning from Oklahoma Steve, I built and flew one of these B-70’s with an 0.020 for power back in ’75 while an Aero Engineering Student at Parks College of St. Louis University. Two things I’d like to share: One it’s a three foot long flying SPEAR! Make sure it’s not going to come down anywhere near other people. Two, launch it level, NOT nose up. The wing can and will blank out the rudders. So what you thought was set for a nice turn will take off in a straight line in the last direction it was pointed in. Other than that it was a lot of fun!
ThomasSolinski - 19/05/2015
I flew a Competition Models B-70 back in the mid 1960s that was built by my dad. It flew nicely on a Cox .020 reed valve engine and was eventually lost OOS in a thermal. I've been looking for a quickie, all sheet project for electric power, and due to the nostalgia value this one holds for me, this will be it. A sincere thank-you for making this plan available and the memories!
BobKeller - 20/05/2015
Back in the early '60s my Dad and I built one of these with an .049 on the back. We flew it several times out at Rosamond Dry Lake not far from Edwards AFB. Being a delta it was fast, glide ratio un-powered was pretty steep, but it sure looked neat in the air!! Like the previous commenter stated it was a bit of a powered dart so I had to make sure everyone was watching whenever we launched it. Thanks for making the plan available, I can't wait to make another one!!
DanielS - 30/07/2018
Got bored the other day and put a B-70 together [pic 003]. Neat lookin' ... powered w/ a Cox .020, we'll see how it flies when the weather improves.
Alrob - 12/02/2021
Add a comment
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
© Outerzone, 2011-2022.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.